JP6683037B2 - Wood steel composite floor structure - Google Patents

Description

  The present invention relates to a wood-steel composite floor structure provided as a floor structure of a wooden building.

  Conventionally, the structure of a building unit, which is the smallest unit for production and construction, is utilized, design and production are easy, the configuration is simple, cost can be reduced, and workability can be improved. Reinforcement mounts for seismic buildings have been proposed.

  The reinforcing base for a base-isolated building disclosed in Patent Document 1 is provided in the lowermost layer of the upper structure of the base-isolated building, which is a unit building, and is located between the base-isolation support device and the upper structure. A reinforcing frame for a building, in which a frame-shaped frame frame having a rising piece that faces the outer peripheral surface of the floor beam of each building unit that constitutes a unit building and a horizontal piece that the lower surface of the floor beam contacts is one unit Is characterized by being configured by the combination.

  Then, in the reinforcing base for a seismic isolated building disclosed in Patent Document 1, the base frame constituting the reinforcing base is configured by a rectangular side base frame having four sides that are in contact with the floor beams of the building unit, as necessary. In addition, one corner portion of the gantry frame on the four sides is provided with a striking beam that is provided to be inclined with respect to the floor beam that constitutes the gantry frame.

JP-A-2002-180546

Nippon Steel & Sumitomo Metal Corporation Press Release 2013 Internet <URL: http://www.nssmc.com/news/20130307_100.html> Shishido's only Tsutomu Kobayashi, Koji Akioka, Masaaki Nakayasu, Yasuhiro Oshima, Kazu Kanayama New products and application technology of Smart Beam Nippon Steel & Sumitomo Metal Technical Report No. 403 p. 113-p. 120

  Here, in a floor structure of a wooden structure such as a store-house or a nursing home for the elderly, not only structural performance such as proof strength and rigidity in the out-of-plane direction and in-plane direction but also sound insulation of upper and lower floors or when walking on the floor It is necessary to design in consideration of environmental performance such as floor vibration. As one of the floor vibration evaluation methods, for example, there is a method that pays attention to the vibration velocity for each frequency, as shown in, for example, the Practical Noise Countermeasures Guide, Applied Edition of the Architectural Institute of Japan.

  In this evaluation method, the response of the vibration velocity for each frequency is compared with its allowable value, but the allowable value of the vibration velocity tends to increase linearly in the region of 8 Hz or higher. Therefore, in this evaluation method, considering that the primary natural frequency of the floor in a general house is 8 Hz or more, the allowable value of the vibration speed linearly increases as the primary natural frequency of the floor increases. Therefore, the effect of suppressing floor vibration can be obtained.

  In the reinforced mount for a base-isolated building disclosed in Patent Document 1, the firing beam is provided to be inclined with respect to the floor beam at the corner of the pedestal frame, but the purpose of the firing beam is to improve in-plane rigidity and proof strength. Therefore, although the web part of the striking beam is joined to the web part of the floor beam by pin joining, the striking beam is not fixed to the floor material at all. At this time, in the reinforced frame for the base-isolated building disclosed in Patent Document 1, since the striking beam is not fixed to the floor material and the bending force is not transmitted from the floor material to the striking beam, the entire floor material vibrates on the floor. There is a problem that it is difficult to obtain the additional effect of suppressing the floor vibration in the area.

  In the floor structure disclosed in Non-Patent Document 1, the main support horizontal member (corresponding to a large beam) is used as a laminated member, and the sub-support horizontal member (corresponding to a small beam) is made of steel. In particular, when the span length of the sub supporting horizontal member is 5 m to 6 m, the effect of suppressing floor vibration can be obtained. However, in the floor structure disclosed in Non-Patent Document 1, when the span length of the sub-supporting horizontal member is as large as 7 m to 8 m, there is a limit to the member composition of the sub-supporting horizontal member due to the space limitation behind the ceiling. In consideration of the fact that there is a limit to the thickness of the plate that can be used for the horizontal material, considering that the floor material is fastened to the horizontal material with screws, etc., floor vibration is suppressed. There is a problem that it is difficult to obtain the effect.

  Therefore, the present invention has been devised in view of the above-mentioned problems, and the purpose thereof is mainly for large-scale wooden buildings such as stores combined housing or nursing care facilities for the elderly. Another object is to provide a wood-steel composite floor structure that suppresses floor vibration and improves environmental performance.

A wood-steel composite floor structure according to a first aspect of the present invention is a wood-steel composite floor structure provided as a floor structure of a wooden building, wherein a plurality of main beam members are erected on a pillar and the main beam members are erected. A sub-beam member and a stiffening member, and a floor member placed and fixed on the sub-beam member and the stiffening member, wherein the plurality of main beam members are in an in-plane direction of the floor member. Are provided so as to intersect each other at the corners of the sub-beam member, and the sub-beam member is connected to one of the main beam members that intersect with each other, and the stiffening member has one end portion in the axial direction of the sub-beam member. Connected to the beam and connected to the other main beam where the other ends intersect each other, or to each of the main beams where the ends intersect each other in the axial direction It is, disposed at a position closer to the corner portion side than the center in the direction of the plane of the floor material, the stiffeners, the in-plane direction of the floor surface material On the corner side, the main beam is arranged so as to be inclined with respect to the main beam, and one end of the main beam is connected to one of the main beam members intersecting each other, and the other is connected in the axial direction. Is connected to the other main beam member intersecting each other .

A wood-steel composite floor structure according to a second aspect of the present invention is a wood-steel composite floor structure provided as a floor structure of a wooden building, wherein a plurality of main beam members are erected on a pillar and the main beam members are erected. A sub-beam member and a stiffening member, and a floor member placed and fixed on the sub-beam member and the stiffening member, wherein the plurality of main beam members are in an in-plane direction of the floor member. Are provided so as to intersect each other at the corners of the sub-beam member, and the sub-beam member is connected to one of the main beam members that intersect with each other, and the stiffening member has one end portion in the axial direction of the sub-beam member. Connected to the beam and connected to the other main beam where the other ends intersect each other, or to each of the main beams where the ends intersect each other in the axial direction It is, disposed at a position closer to the corner portion side than the center in the direction of the plane of the floor material, the stiffeners, the in-plane direction of the floor surface material A part or all of the stiffening material, which is provided by being divided in the material axis direction by one or a plurality of the sub-beam members on the corner side and is divided in the material axis direction, is with respect to the sub-beam material. It is characterized in that it is arranged so as to be inclined or arranged so as to be substantially orthogonal to the sub-beam member.

In the wood-steel composite floor structure according to the third invention, in the first invention or the second invention , wood is used for the main beam and the floor material, and steel is used for the sub-beam and the stiffening material. It is characterized by being.

The wood-steel composite floor structure according to a fourth aspect of the present invention is the third aspect of the present invention, in which one or both of the sub-beam member and the stiffening member is an intermediate portion in the material width direction of a flange that is a pair in the height direction. Sectional lightweight H-section steel having a web extending in the height direction, or a cross-sectional shape having a web extending in the height direction at one end in the material width direction of a pair of flanges in the height direction It is characterized by the use of the thin lightweight steel sheet.

According to the first invention to the fourth invention, the flooring material is placed and fixed on the stiffening material, and the stiffening material is arranged at a position closer to the corner side than the center of the flooring material. Therefore, for large-scale wooden buildings such as housing combined with stores or nursing care facilities for the elderly, floor vibration is suppressed without increasing the material and plate thickness of sub-beams and stiffeners, and wooden buildings It is possible to improve the environmental performance of.

According to the first invention to the fourth invention, the stiffening material is arranged at a position closer to the corner side of the floor surface material without providing the orthogonal beam material over the entire length of the floor surface material in the depth direction. Thus, it is possible to improve the primary natural frequency while suppressing the weight of the steel material, and to avoid the effect that the primary natural frequency decreases due to the weight of the steel material, so that the primary natural frequency can be efficiently improved. Becomes

According to the first invention to the fourth invention, the stiffening material is arranged at the position closer to the corner side in the in-plane direction of the floor surface material, so that a large space is provided in the back of the ceiling on the center side of the floor surface material. Since the space can be secured, it is possible to secure a space for installing the ceiling-embedded air conditioner or the like in this space behind the ceiling.

In particular, according to the first invention and the second invention, the stiffening material is divided in the material axial direction and arranged so as to be inclined with respect to the main beam material, so that the primary natural frequency per unit weight is improved. Not only that, but the primary natural frequency of the floor material itself becomes large, so that it is possible to achieve both suppression of the weight of the steel material and reliable improvement of the primary natural frequency.

In particular, according to the third aspect of the invention, the floor vibration during walking on the floor can be suppressed without increasing the member composition and the plate thickness of the steel material serving as the sub-beam material and the stiffening material. It is possible to secure a large indoor space by preventing the ceiling above which the stiffening material is provided from being made thicker than necessary.

In particular, according to the fourth aspect of the present invention, a steel material such as lightweight H-section steel or thin-sheet lightweight shaped steel is used as the sub-beam material or the stiffening material, so that the weight of the steel material serving as the sub-beam material or the stiffening material is surely increased. It is possible to efficiently improve the primary natural frequency of the floor material while suppressing the above.

1 is a perspective view showing a wooden building provided with a wood-steel composite floor structure to which the present invention is applied. (A) is a top view which shows the wood-steel composite floor structure to which this invention is applied, (b) is the AA sectional view taken on the line. (A) is a top view which shows the corner | angular part of a floor-surface material in the wood-steel composite floor structure to which this invention is applied, (b) is the front view. (A) is a front view showing a lightweight H-section steel used as a sub beam material and a stiffening material in the wood-steel composite floor structure to which the present invention is applied, and (b) is a front view showing the thin sheet lightweight section steel. Is. It is a top view which shows the stiffener of 1st Example in the wood-steel composite floor structure to which this invention is applied. It is a top view which shows the stiffener of 2nd Example in the wooden steel composite floor structure to which this invention is applied. It is a top view which shows the stiffener of 3rd Example in the wooden steel synthetic floor structure to which this invention is applied. It is a top view which shows the stiffener of 4th Example in the wooden steel synthetic floor structure to which this invention is applied. It is a top view which shows the stiffener of 5th Example in the wood-steel composite floor structure to which this invention is applied. It is a top view which shows the stiffening material of 6th Example with the wooden steel synthetic floor structure to which this invention is applied. It is a top view which shows the stiffening material in which the thing inclining with respect to the sub beam material and the thing substantially orthogonal in the wood-steel composite floor structure to which this invention is applied are combined. (A) is a plan view showing a stiffening member in which one end in the material axis direction is connected to a sub-beam member in a wood-steel composite floor structure to which the present invention is applied, and (b) is a side view thereof. Is. (A) is a top view which shows the stiffening material in which the division | segmentation part of the material axial direction was connected to the sub beam material in the wood-steel composite floor structure to which this invention is applied, and (b) is the side view. . (A) is a front view showing a floor surface material fixed to a stiffener in a wood-steel composite floor structure to which the present invention is applied, and (b) is a conventional reinforced stand for a base-isolated building. It is a front view which shows the stake beam which is not fixed to. (A) is a perspective view showing an analysis model of vibration eigenvalue analysis in which a stiffener is provided in a wood-steel composite floor structure to which the present invention is applied, and (b) is a comparative example in which a stiffener is provided. It is a perspective view which shows the analysis model of the vibration eigenvalue analysis which is not carried out. (A) is a contour diagram showing a height direction mode vector of a floor surface material in a second embodiment of a wood-steel composite floor structure to which the present invention is applied, and (b) is a floor surface material of a comparative example. It is a contour diagram showing a mode vector in the height direction. (A) is a graph which compared the primary natural frequency of floor surface material with 1st Example-4th Example and 6th Example of the wood-steel synthetic floor structure to which this invention was applied, and a comparative example, (B) is a graph comparing the primary natural frequencies per unit weight.

  Hereinafter, an embodiment for carrying out the wood-steel composite floor structure 1 to which the present invention is applied will be described in detail with reference to the drawings.

  The wood-steel composite floor structure 1 to which the present invention is applied is mainly provided in a wooden building 8 such as a house or an office, as shown in FIG. The wood-steel composite floor structure 1 to which the present invention is applied is provided as a floor structure of a relatively large-scale wooden building 8 such as a store-house or a nursing home for the elderly.

  The wood-steel composite floor structure 1 to which the present invention is applied is, for example, in a wooden building 8 including a plurality of floors such as a two-story building or a three-story building, a column member 81 continuous from the lower floor to the upper floor, and each floor. It is provided together with the wall material 82 such as the load bearing wall and the tree joists 83, and has a floor structure that separates the upper floor and the lower floor.

  The wood-steel composite floor structure 1 to which the present invention is applied includes a plurality of main beam members 2 erected on a column member 81, a sub-beam member 3 and a stiffening member 4 erected on the plurality of main beam members 2, The beam member 3 and the floor member 6 mounted and fixed on the stiffening member 4 are provided. In the wood-steel composite floor structure 1 to which the present invention is applied, the stiffening member 4 and the main beam member 2 or the sub-beam member 3 have a total moment and a total shearing force because the floor member 6 is fixed. It is joined by a rigid joint which is transmitted or a semi-rigid joint which transmits a part of moment and total shear force.

  In the wood-steel composite floor structure 1 to which the present invention is applied, a plurality of main beam members 2 are arranged along the outer circumference of the wooden building 8 and the sub-beams extend from the outer circumference of the wooden building 8 toward the inside. The material 3 is arranged. In the wood-steel composite floor structure 1 to which the present invention is applied, a floor surface member 6 is formed into a substantially rectangular planar shape, and each main beam member 2 is arranged on four sides of the substantially rectangular floor surface member 6. It

  The floor surface material 6 is mainly made of solid wood, plywood, laminated wood, LVL, CLT, or other substantially plate-shaped wood, and the depth direction X and the width direction Y of the wooden building 8 are in-plane. Direction. In the floor surface material 6, a column material 81 is arranged at each corner 60 at a position that is substantially the center in the depth direction X and the width direction Y is the center C in the in-plane direction, and is at four corners in the in-plane direction. To be done.

  The main beam member 2 is mainly made of solid wood, laminated wood, LVL or CLT, and the main beam member 2 is formed to have a substantially rectangular cross-section. Each of the main beam members 2 is adjacent to the depth direction X of the wooden structure 8 and extends in the height direction Z, or a plurality of pillar members 81, or adjacent to the width direction Y of the wooden structure 8 in the height direction Z. Is erected on a plurality of pillar members 81 extending to the.

  As shown in FIG. 2, the plurality of main beam members 2 are arranged on each of the four sides of the flooring member 6, and the main beam members 2 extending in the depth direction X are provided as a pair in the width direction Y. A pair of main beam members 2 extending in the width direction Y is provided in the depth direction X. Each of the plurality of main beam members 2 is installed on a column member 81 at each corner 60 in the in-plane direction of the floor surface member 6.

  In the plurality of main beam members 2, for example, one or a plurality of sub-beam members 3 are arranged between the pair of main beam members 2 in the width direction Y. At this time, in the case where the plurality of main beam members 2 are arranged, the plurality of sub beam members 3 are arranged at substantially equal intervals between the pair of main beam members 2 in the width direction Y. Are arranged so that, for example, one sub-beam member 3 passes through the center C of the floor surface member 6 in the in-plane direction.

  As shown in FIG. 3, the plurality of main beam members 2 include a main beam member 2 extending in the depth direction X and a main beam member 2 extending in the width direction Y at corners 60 in the in-plane direction of the floor surface member 6. , So as to intersect with each other. The plurality of main beam members 2 intersect the main beam member 2 extending in the depth direction X and the main beam member 2 extending in the width direction Y so as to be substantially orthogonal to each other, for example, to intersect in an obtuse shape or an acute angle shape. May be.

  In the plurality of main beam members 2, the main beam members 2 extending in the width direction Y intersecting with each other are one main beam member 21, and the main beam members 2 extending in the depth direction X intersecting with each other are the other main beam members. Material 22. In the plurality of main beam members 2, the main beam member 2 extending in the depth direction X may be one main beam member 21, and the main beam member 2 extending in the width direction Y may be the other main beam member 22. In order to show the relationship between the main beam members 2, the expression that they intersect with each other will be used hereinafter.

  As the sub-beam member 3 and the stiffening member 4, as shown in FIG. 4, a steel material 5 such as lightweight H-section steel or thin sheet lightweight section steel is mainly used. The lightweight H-section steel is manufactured by roll forming, laser welding, electric resistance welding, arc welding, or the like. The plate thickness of the flange 51 and the web 52 is often 12 mm or less.

  Here, in the lightweight H-section steel, as shown in FIG. 4A, a web 52 extending in the height direction Z is formed at an intermediate portion in the material width direction of a pair of flanges 51 in the height direction Z. It has a cross-sectional shape. As shown in FIG. 4 (b), the thin sheet light-section steel has a cross-sectional shape in which a web 52 extending in the height direction Z is formed at one end portion in the material width direction of a pair of flanges 51 in the height direction Z. Becomes

  When one or both of the sub-beam member 3 and the stiffening member 4 is used as the lightweight H-shaped steel material 5, for example, the member composition H is about 80 mm to 450 mm, and the width dimension B is about 40 mm to 200 mm. Becomes Further, the plate thickness t1 of the web 52 is about 2.3 mm to 6 mm, and the plate thickness t2 of the flange 51 is about 2.3 mm to 12 mm.

  When one or both of the sub-beam member 3 and the stiffening member 4 is used, for example, when the steel material 5 of thin plate lightweight section steel is used, the member composition H is about 80 mm to 300 mm, and the width dimension B is about 30 mm to 50 mm. Becomes Further, the plate thickness t1 of the web 52 is about 0.8 mm to 2.2 mm, and the plate thickness t2 of the flange 51 is also about 0.8 mm to 2.2 mm.

  As shown in FIG. 2A, the sub-beam member 3 is provided so as to extend only in the depth direction X, and is installed on the pair of main beam members 2 in the depth direction X. At this time, in the sub-beam member 3, as shown in FIG. 2B, the main beam member 2 extending in the width direction Y is used as one main beam member 21 at the corner 60 in the in-plane direction of the floor surface member 6. It is installed on one of the main beam members 21 that intersect with each other.

  The sub-beam member 3 is installed so as to be substantially orthogonal to the main beam member 2, but may be installed so as to be inclined with respect to the main beam member 2 as necessary. The sub-beam member 3 has a relatively large span length L in the material axis direction, particularly in a store-combined housing or a health care facility for the elderly, for example, a span length L of 6 m or more and 10 m or less, and further, 7 m or more, The span length L is 9 m or less.

  The sub-beam member 3 is formed so as to continuously extend in the depth direction X, and each of the pair of main beam members 21 in the depth direction X is connected to both end portions 31 in the material axial direction. To be done. The sub-beam member 3 is attached to the side surface of the main beam member 2 and the side surface of the sub-beam member 3, for example, by attaching a jointing metal 7 having a substantially L shape and bolt-joining or screw-joining the both ends of the main beam member 2. 31 is connected. In addition, the sub-beam member 3 may be provided so as to extend only in the width direction Y and be installed on the main beam member 2 paired in the width direction Y, if necessary.

  As shown in FIGS. 5 to 11, the stiffening member 4 is arranged at a position closer to the corner side S than the center C of the floor surface member 6 in the in-plane direction. At this time, in the stiffening member 4, as shown in FIGS. 5 to 8, each of the one end portion 41 and the other end portion 42 in the material axis direction has one main beam member 21 and the other main beam member. 22 are connected to each. Further, as shown in FIGS. 9 to 11, the stiffening member 4 may have one end 41 connected to the sub-beam member 3 and the other end 42 connected to the other main beam member 22. Good.

  As shown in FIGS. 5 to 8, the stiffening member 4 is inclined with respect to the main beam member 2 on the corner side S in the in-plane direction of the floor surface member 6 in the first to fourth embodiments. Arranged to do so. At this time, as shown in FIG. 3 (b), the stiffening member 4 is one main beam in which one end 41 in the material axis direction crosses each other at a corner 60 in the in-plane direction of the floor surface member 6. It is connected to the material 21 by the joining metal fitting 7 or the like. In addition, the stiffening member 4 is connected to the other main beam member 22 in which the other end portion 42 intersects with each other at the corner portion 60 in the in-plane direction of the floor surface member 6 in the material axis direction by the joining metal fitting 7 or the like. .

  As shown in FIG. 5, in the first embodiment, the stiffening member 4 is provided on the corner side S in the in-plane direction of the floor surface member 6 without being divided by the sub-beam member 3 in the material axial direction. . The stiffening member 4 is connected to the one main beam member 21 and the other main beam member 22 from the one end portion 41 to the other end portion 42 without being divided in the material axial direction, and the floor member 6 Is arranged at a position close to the corner 60 of the.

  As shown in FIG. 6, in the second embodiment, the stiffening member 4 is divided into two in the material axial direction by one sub-beam member 3 at the corner side S in the in-plane direction of the floor surface member 6. Will be provided. At this time, although the stiffening member 4 is divided into two in the material axis direction, one end portion 41 is connected to one main beam member 21 and the other end portion 42 is connected to the other main beam member. It is connected to 22 and is arranged closer to the center C of the floor surface material 6 than the stiffening material 4 of the first embodiment.

  As shown in FIG. 7, the stiffening member 4 is divided into three parts in the axial direction by the two sub-beam members 3 on the corner side S in the in-plane direction of the floor surface member 6 in the third embodiment. Will be provided. At this time, although the stiffening member 4 is divided into three parts in the material axis direction, one end portion 41 is connected to one main beam member 21 and the other end portion 42 is connected to the other main beam member. It is connected to 22 and is arranged closer to the center C of the floor surface material 6 than the stiffening material 4 of the second embodiment.

  As shown in FIG. 8, the stiffening member 4 is divided into four parts in the axial direction by the three auxiliary beam members 3 on the corner side S in the in-plane direction of the floor surface member 6 in the fourth embodiment. Will be provided. At this time, although the stiffening member 4 is divided into four in the material axis direction, one end portion 41 is connected to one main beam member 21 and the other end portion 42 is connected to the other main beam member. 22 and is arranged closer to the center C side of the floor surface material 6 than the stiffening material 4 of the third embodiment.

  As shown in FIG. 9 and FIG. 10, the stiffening member 4 is in the in-plane direction corner side S of the floor surface member 6 with respect to the main beam member 2 in the fifth and sixth embodiments. You may arrange | position so that it may be substantially orthogonal. At this time, the stiffening member 4 is connected to the sub-beam member 3 that is erected on the one main beam member 21 that intersects with each other, and the one end portion 41 in the material axis direction is particularly The other end portion 42 is connected to the other main beam member 22 that intersects with each other.

  As shown in FIG. 9, in the fifth embodiment, the stiffening member 4 is provided on the corner side S in the in-plane direction of the floor surface member 6 without being divided by the sub-beam member 3 in the material axial direction. . The stiffening member 4 is connected from the one end 41 to the other end 42 in the material axial direction without being divided, and the one end 41 is connected to the sub-beam member 3 and the other end 42 is It is connected to the other main beam member 22 and arranged at a position close to the corner portion 60 of the floor surface member 6.

  As shown in FIG. 10, the stiffening member 4 is substantially stepwise in the material axial direction by one or a plurality of sub-beam members 3 on the corner side S in the in-plane direction of the floor surface member 6 in the sixth embodiment. It is divided into two parts. At this time, although the stiffening member 4 is divided in a substantially stepwise manner in the material axis direction, one end portion 41 is connected to the sub-beam member 3 and the other end portion 42 is connected to the other main beam member 22. And is arranged closer to the center C side of the floor surface material 6 than the stiffening material 4 of the fifth embodiment.

  The stiffening member 4 is arranged such that all of the stiffening members 4 divided in the material axis direction are inclined with respect to the sub-beam member 3, as shown in FIGS. As shown in FIG. 10, they are arranged so as to be substantially orthogonal to the sub-beam member 3. Further, as shown in FIG. 11, the stiffening member 4 is arranged such that a part of the stiffening member 4 divided in the material axis direction is inclined or substantially orthogonal to the sub beam member 3, and The stiffening member 4 inclined with respect to the beam member 3 and the stiffening member 4 substantially orthogonal to each other may be combined.

  One end 41 of the stiffening member 4 in the material axis direction may be connected to the sub-beam member 3 as well as the main beam member 2. At this time, as shown in FIG. 12A, the stiffening member 4 is provided on the side surface of the web 52 or the like of the sub-beam member 3 and the side surface of the web 52 or the like of the stiffening member 4 for an end portion having a substantially V shape. One end portion 41 is connected to the sub-beam member 3 by attaching the joining member 71 and performing bolt joining or screw joining.

  As shown in FIG. 12B, the stiffening member 4 is fixed by placing the floor member 6 together with the sub-beam member 3. At this time, the stiffening member 4 is fixed to the floor member 6 by bolting or screwing so as to straddle the upper beam 51a of the sub-beam member 3 and the stiffening member 4. Further, the stiffening member 4 has a substantially flat plate-like lower surface joining member 72 such as a bolt joint or a screw joint so as to straddle the sub-beam member 3 and the lower flange 51b of the stiffener member 4 as necessary. May be fixed at.

  When the stiffening member 4 is provided by being divided in the material axis direction by the sub-beam member 3, for example, as shown in FIG. 13A, the side surface of the web 52 of the sub-beam member 3 and the stiffening member 4 are provided. A dividing joining member 73 having a substantially mountain shape or the like is attached to a side surface of the web 52 or the like. At this time, the stiffening member 4 is to be bolt-bonded or screw-bonded by attaching the dividing joining member 73 to the side surfaces of the sub-beam member 3 and the stiffening member 4 at the dividing point D divided by the sub-beam member 3. Then, the dividing point D is connected to the sub-beam member 3.

  As shown in FIG. 13 (b), the stiffening member 4 has the floor member 6 placed on the sub-beam member 3 and the stiffening member 4 at the dividing point D divided in the axial direction of the sub-beam. The floor material 6 is fixed together with the material 3. At this time, the stiffening member 4 is fixed to the floor member 6 by bolt bonding or screw bonding so as to straddle the sub-beam member 3 and the upper flange 51a of the stiffening member 4. In addition, the stiffening member 4 is of a substantially flat plate shape or the like so as to straddle the sub-beam member 3 and the lower flange 51b of the stiffening member 4 at a dividing position D that is divided in the material axis direction, if necessary. The lower surface joining member 72 may be fixed by bolt joining, screw joining, or the like.

  In the wood-steel composite floor structure 1 to which the present invention is applied, as shown in FIG. 14 (a), the floor surface material 6 is placed and fixed on the stiffening material 4. At this time, in the wood-steel composite floor structure 1 to which the present invention is applied, not only the shearing force Q is transmitted from the sub-beam member 3 to the stiffening member 4 and from the stiffening member 4 to the main beam member 2, but also the floor surface From the sub-beam member 3 integrated with the member 6 to the stiffener member 4 integrated with the floor member 6, and the stiffener member 4 integrated with the floor member 6 integrated with the floor member 6. By transmitting the bending moment M to the main beam member 2, floor vibration when the occupant or the like walks on the floor is suppressed.

  On the other hand, in the conventional reinforced frame 9 for seismic isolated building, as shown in FIG. 14 (b), the striking beam 91 is connected to the floor beam 92 forming the corner portion of the gantry frame in an inclined manner. However, the striking beam 91 is not fixed to the floor material 93, and the pin connection is not intended to transmit the bending moment M only for transmitting the shearing force Q, and only the web portion of the striking beam 91 is the web portion of the floor beam 92. Will be joined to. Therefore, in the conventional reinforced frame 9 for a base-isolated building, the shearing force Q is transmitted from the floor beam 92 to the striking beam 91, but the bending moment M is not transmitted from the floor material 93 to the striking beam 91.

  In the wood-steel composite floor structure 1 to which the present invention is applied, the floor surface material 6 is placed and fixed on the stiffening material 4, and in particular, as shown in FIGS. The stiffener 4 is arranged at a position closer to the corner side S than the center C in the inward direction. At this time, in the wood-steel composite floor structure 1 to which the present invention is applied, the bending moment M is transmitted from the floor surface material 6 to the stiffening material 4, and floor vibration during walking on the floor is suppressed. The floor vibration region F is only on the side of the center C excluding the corner side S of 6.

  On the other hand, in the conventional reinforced base 9 for a seismic isolated building shown in FIG. 14B, since the striking beam 91 is not fixed to the floor material 93, the entire surface of the floor material 93 becomes the floor vibration area F. Therefore, in the wood-steel composite floor structure 1 to which the present invention is applied, as compared with the case where the entire surface including the corner side S of the floor surface material 6 is the floor vibration area F, the corner side of the floor material 6 is Since the floor vibration region F is reduced only on the side of the center C excluding S, the primary natural frequency of the floor surface material 6 at the time of walking on the floor is improved.

  In addition, in FIGS. 12 and 14 (a), the joint metal 7 shown in FIG. 2 (b) for connecting the sub-beam member 3 and the main beam member 2, and the stiffening member 4 and the main beam member 2 are connected. Illustration of the metal joint 7 and the like shown in FIG.

  Here, vibration eigenvalue analysis was performed to examine the environmental performance related to floor vibration when walking on the floor. In this vibration eigenvalue analysis, as shown in FIG. 15, seven sub-beam members 3 having a span length L of 7280 mm were provided. In addition, the sub-beam member 3 and the stiffening member 4 are both H-shaped steels having a member composition of 400 mm, a flange width of 135 mm, a flange plate thickness of 6 mm, and a web plate thickness of 4.5 mm. Was used as a pin support. Furthermore, the floor surface material 6 has a width dimension and a depth dimension of 7280 mm, and after plywood with a plate thickness of 24 mm, gypsum board with a plate thickness of 12.5 mm, and flooring with a plate thickness of 12 mm are overlapped, all in the in-plane direction. The circumference was used as a pin support.

  In this vibration eigenvalue analysis, as the wood-steel composite floor structure 1 to which the present invention shown in FIG. 15 (a) is applied, first to fourth examples shown in FIGS. 5 to 8 and sixth example shown in FIG. An example was used as an analytical model. As a comparative example for comparison with the wood-steel composite floor structure 1 to which the present invention is applied, as shown in FIG. 15B, three orthogonal beam members 90 extending over the entire length of the floor surface member 6 in the width direction Y are provided. However, the analysis model is provided in such a manner that the stiffening member 4 is not provided although the stiffening member 4 is provided at substantially equal intervals orthogonal to the sub-beam member 3. In addition, the screw connection between the sub-beam member 3 and the stiffening member 4 and the floor surface member 6 was set to a predetermined spring constant so that the experimental result and the analysis result match.

  In FIG. 16, in consideration of the symmetry of the floor surface, only the ¼ area from the center C side to the corner side S in the in-plane direction of the floor surface material 6 in the height direction Z of the floor surface material 6 The mode vector is shown. Here, a region in which the component in the height direction Z of the floor surface material 6 is relatively large is shown in dark color, and a region in which the component in the height direction Z of the floor surface material 6 is relatively small is shown in light color. There is. At this time, in the second embodiment of the wood-steel composite floor structure 1 to which the present invention shown in FIG. 16 (a) is applied, the dark color portion is narrower than that of the comparative example shown in FIG. 16 (b), and the floor covering 6 It can be seen that the region in which the component in the height direction Z becomes large is reduced.

  In FIG. 17, in comparison with the first to fourth examples and the sixth example in which the stiffening member 4 is provided in the wood-steel composite floor structure 1 to which the present invention is applied, and three orthogonal beam members 90 are provided. The examples were compared with the primary natural frequency of the flooring material 6. Here, as shown in FIG. 17A, also in the comparative example in which three orthogonal beam members 90 are provided, the three orthogonal beam members 90 together with the seven auxiliary beam members 3 have the rigidity of the floor material 6. It can be seen that the primary natural frequency itself of the flooring material 6 is improved because it contributes to the improvement.

  However, in the comparative example in which the three orthogonal beam members 90 are provided, since the orthogonal beam members 90 are provided over the entire length of the floor surface member 6 in the width direction Y, the weight of the steel material used for the orthogonal beam members 90 increases. To do. Therefore, as shown in FIG. 17 (b), in order to consider both the suppression of the weight of the steel material and the improvement of the primary natural frequency, a plurality of sub-beam members 3 and stiffening members 4 or orthogonal beam members 90 are The primary natural frequency of the floor material 6 was divided by the total of the steel material weights, and the primary natural frequency per unit weight was compared.

  Then, the primary natural frequency per unit weight, in the case where the comparative example is set to the reference value (= 1.0), in any of the first to fourth examples and the sixth example of the present invention, It can be seen that the primary natural frequency per unit weight is improved. Therefore, in the wood-steel composite floor structure 1 to which the present invention is applied, it is not necessary to provide the orthogonal beam members 90 extending over the entire length of the floor surface member 6 in the width direction Y, and the wood beam can be brought close to the corner side S of the floor surface member 6. By arranging the stiffening member 4 at a different position, it is possible to improve the primary natural frequency while suppressing the weight of the steel material.

  Moreover, in the wood-steel composite floor structure 1 to which the present invention is applied, not only the primary natural frequency per unit weight is improved, but especially in the third embodiment or the fourth embodiment, as shown in FIG. As shown, the primary natural frequency itself of the flooring material 6 is higher than that of the comparative example in which the orthogonal beam material 90 is provided. Therefore, in the wood-steel composite floor structure 1 to which the present invention is applied, as shown in FIGS. 7 and 8, the stiffening member 4 is arranged so as to be divided in the axial direction and inclined with respect to the main beam member 2. By doing so, it becomes possible to achieve both suppression of the weight of the steel material and reliable improvement of the primary natural frequency.

  In the wood-steel composite floor structure 1 to which the present invention is applied, as shown in FIG. Further, not only the shearing force Q is transmitted from the stiffening member 4 to the main beam member 2, but also the sub-beam member 3 integrated with the floor member 6 to the stiffening member 4 integrated with the floor member 6. Further, the bending moment M is transmitted from the stiffening member 4 integrated with the floor member 6 to the main beam member 2 integrated with the floor member 6, and the effect of the continuous beam is exerted. At this time, in the wood-steel composite floor structure 1 to which the present invention is applied, in the peripheral portion of the floor vibration region F shown in FIGS. It becomes possible to fix it.

  Further, in the wood-steel composite floor structure 1 to which the present invention is applied, the stiffening member 4 is arranged at a position closer to the corner side S than the center C of the floor surface member 6 in the in-plane direction. The self-weight of 4 does not act to reduce the primary natural frequency. At this time, in the wood-steel composite floor structure 1 to which the present invention is applied, it is possible to avoid the effect that the primary natural frequency decreases due to the weight of the steel material, so that the primary natural frequency can be efficiently improved.

  Further, in the wood-steel composite floor structure 1 to which the present invention is applied, since the stiffening member 4 is arranged at a position closer to the corner side S in the in-plane direction of the floor surface material 6, the center C of the floor surface material 6 is placed. A large space can be secured behind the ceiling on the side. At this time, in the wood-steel composite floor structure 1 to which the present invention is applied, the space behind the ceiling on the center C side of the floor surface material 6 becomes large, so that an installation space for a ceiling-embedded air conditioner or the like is provided in this ceiling behind. Can be secured.

  Further, in the wood-steel composite floor structure 1 to which the present invention is applied, since the stiffening member 4 is arranged at a position closer to the corner side S in the in-plane direction of the floor surface member 6, as shown in FIG. Floor vibration during walking on the floor can be suppressed without increasing the member formation H and the plate thickness of the sub-beam member 3 and the steel member 5 serving as the stiffening member 4. At this time, in the wood-steel composite floor structure 1 to which the present invention is applied, it is possible to secure a large indoor space by not thickening the back of the ceiling where the sub-beam member 3 and the stiffening member 4 are provided more than necessary. . Further, since the plate thickness of the steel material 5 is small, simple dry joining by screw joining is also possible.

  In the wood-steel composite floor structure 1 to which the present invention is applied, since the steel material 5 such as the lightweight H-section steel or the thin sheet lightweight steel is used as the sub-beam member 3 or the stiffening member 4, the sub-beam member 3 or the auxiliary beam member 3 is particularly used. It is possible to reliably suppress an increase in the weight of the steel material that becomes the rigid material 4. At this time, the wood-steel composite floor structure 1 to which the present invention is applied can efficiently improve the primary natural frequency while reliably suppressing the weight of the steel material that becomes the sub-beam material 3 or the stiffening material 4. Become.

  As shown in FIG. 2, the wood-steel composite floor structure 1 to which the present invention is applied is mainly applied to a relatively large-scale wooden building 8 in which the span length L of the main beam member 2 or the sub-beam member 3 is large. As shown in FIGS. 5 to 11, the stiffening member 4 is arranged at a position closer to the corner side S than the center C of the floor surface member 6. At this time, the wood-steel composite floor structure 1 to which the present invention is applied is made up of a sub-beam member 3 and a stiffener member 4 for a large-scale wooden building 8 such as a store-house or a nursing home for the elderly. It is possible to suppress the floor vibration without increasing the plate thickness and improve the environmental performance of the wooden building 8.

  Although the examples of the embodiments of the present invention have been described in detail above, the above-described embodiments are merely examples of specific embodiments for carrying out the present invention, and the technical aspects of the present invention are thereby described. The range should not be construed as limiting.

1: Wood-steel composite floor structure 2: Main beam member 21: One main beam member 22: The other main beam member 3: Sub-beam member 31: Both ends 4: Stiffening member 41: One end 42: The other End 5: Steel material 51: Flange 51a: Upper flange 51b: Lower flange 52: Web 6: Floor material 60: Corner 7: Joining metal 71: End joining member 72: Bottom joining member 73: Dividing joint Member 8: Wooden building 81: Pillar material 82: Wall material 83: Tree joist C: Center S: Corner side F: Floor vibration area X: Depth direction Y: Width direction Z: Height direction

Claims (4)

A wooden steel composite floor structure provided as a floor structure of a wooden building,
A plurality of main beam members erected on a pillar member, a sub-beam member and a stiffening member erected on the main beam member, and a floor surface member placed and fixed on the sub-beam member and the stiffening member With and
The plurality of main beam members are provided so as to intersect each other at corners in the in-plane direction of the floor surface member, and the sub beam members are connected to one of the main beam members that intersect with each other,
The stiffening member has one end connected to the sub-beam and the other end connected to the other main beam in the axial direction, or in the axial direction. Each end is connected to each of the main beam members intersecting each other, and arranged at a position closer to the corner side than the center of the floor surface member in the in-plane direction ,
The stiffening member is arranged so as to be inclined with respect to the main beam member on the corner side in the in-plane direction of the floor surface member, and one end portion of which crosses one another in the material axis direction. A wood-steel composite floor structure, characterized in that it is connected to the main beam member and is connected to the other main beam member having the other ends intersecting each other in the material axis direction. A wooden steel composite floor structure provided as a floor structure of a wooden building,
A plurality of main beam members erected on a pillar member, a sub-beam member and a stiffening member erected on the main beam member, and a floor surface member placed and fixed on the sub-beam member and the stiffening member With and
The plurality of main beam members are provided so as to intersect each other at corners in the in-plane direction of the floor surface member, and the sub beam members are connected to one of the main beam members that intersect with each other,
The stiffening member has one end connected to the sub-beam and the other end connected to the other main beam in the axial direction, or in the axial direction. Each end is connected to each of the main beam members intersecting each other, and arranged at a position closer to the corner side than the center of the floor surface member in the in-plane direction ,
The stiffening member is provided on the corner side in the in-plane direction of the floor surface member by being divided in the material axial direction by one or a plurality of the sub-beam members, and the stiffening material divided in the material axial direction. A part of or all of the timber is arranged so as to be inclined with respect to the sub-beam material, or is arranged so as to be substantially orthogonal to the sub-beam material. . 3. The wood-steel composite floor structure according to claim 1, wherein wood is used for the main beam member and the floor member, and steel is used for the auxiliary beam member and the stiffening member. One or both of the sub-beam member and the stiffening member has a cross-sectional lightweight H shape in which a web extending in the height direction is formed at an intermediate portion in the material width direction of a pair of flanges in the height direction. steel, or claim 3, wherein the thin light-weight shaped steel cross-sectional shape web is formed is used which extends in height direction at one end portion of the timber width direction of the flange which became a pair in a height direction Wood steel composite floor structure.