JP7326097B2 - brace - Google Patents

Description

The present invention relates to braces used to reinforce buildings.

2. Description of the Related Art Conventionally, as one of braces for reinforcing a building, one has been proposed that includes a core member such as an elongated steel plate and two wooden stiffening members for preventing the core member from buckling. Between its ends, the core member is sandwiched between and held between the stiffening members that are adhered to each other.

According to this, when the building receives an external force such as seismic force, the core member of the brace attached to the building is subjected to a tensile force or a compressive force, which is the axial force. A core member subjected to an axial force deforms in its axial direction between two stiffening members and absorbs part of the seismic force. The stiffening members constrain the core member therebetween so that it does not buckle when subjected to compressive forces.

By the way, in the above conventional brace, when an excessive compressive force acts on the core member, the resulting deformation (bending) of the core member causes the stiffening members to separate from each other. force exerted and the ability of both stiffening members to restrain the core member could be lost.

JP 2008-174932 A

SUMMARY OF THE INVENTION It is an object of the present invention to provide a brace in which the binding ability of the wooden stiffening member to the core member is less likely to be lost.

The present invention relates to braces. The brace comprises an elongated steel core member having opposite ends, a stiffening member of wood extending longitudinally of the core member holding the core member between the ends thereof, and one or more binding members helically wound around the member and exerting a clamping force on the stiffening member from the periphery of the stiffening member , the core member comprising a flat plate, the one stiffening member comprising: The stiffening member has a groove which is open to the peripheral surface and has a depth greater than the width of the core member for receiving and holding the core member between its ends within the groove.
The brace also includes an elongated steel core member having opposite ends, two stiffening members of wood extending longitudinally of the core member holding the core member between the ends thereof, and the stiffener. one or more tying members helically wrapped around the member to exert a clamping force on the stiffening member from the periphery of the stiffening member, the core member comprising a flat plate portion and from opposite sides of the flat plate portion, respectively; The two stiffening members each have an elongated flat surface extending in the longitudinal direction of the core member and a groove opening into the flat surface. one stiffening member contacts one side of the flat plate portion on the flat surface and receives one of the upright plate portions in the groove, and the other stiffening member contacts the flat plate portion on the flat surface. and receive the other upright plate portion in the groove so that the two stiffening members sandwich the flat plate portion at a distance from each other, thereby holding the core member between its ends. do.
The brace also includes an elongated steel core member having opposite ends, four wooden stiffening members extending longitudinally of the core member to hold the core member between the ends thereof, and the stiffener. one or more tying members helically wrapped around the member to exert a clamping force on the stiffening member from the periphery of the stiffening member, the core member comprising a flat plate portion and from opposite sides of the flat plate portion, respectively; The four stiffening members sandwich the flat plate portion and the two upright plate portions, respectively, to support the core member at both ends thereof. Retain between departments.

In the brace according to the present invention, the core member and one or more wooden stiffening members that hold the core member between its ends are spirally wound around the stiffening member to tighten the binding member. They are united under force, and the core member is restrained by the stiffening member. The brace is attached to the building at both ends of its core member. When an external force such as seismic force acts on the building, the core member of the brace receives a tensile force or a compressive force in its longitudinal direction, resisting the frictional force between the stiffening members and the brace in its longitudinal direction. It expands and contracts and functions to absorb part of the external force. On the other hand, the stiffening member serves to prevent buckling of the core member when the core member is subjected to compressive forces.

According to the invention, since the binding member extends spirally around the stiffening member, the stiffening member extends from the periphery of the stiffening member and at all points in the longitudinal direction of the stiffening member. receive a substantially uniform tightening force at Accordingly, it is possible to provide a brace in which separation between the core member and the stiffening member is less likely to occur, and thus the ability to restrain the core member is less likely to be lost.

In an example where the number of the binding members is plural, the plurality of binding members may be wound forward at intervals, or may be wound forward and reverse so as to intersect each other. .

The stiffening member may have as many grooves as the tie members extending spirally around the stiffener member, and the tie members may extend within the grooves. Here, the groove may be filled with a synthetic resin adhesive that fills the binding member in the groove.

Further, preferably, the core member and the stiffening member are in contact with each other via an unbonded material. Further preferably, the stiffening member has a peripheral surface that is a portion of a cylindrical surface. Further preferably, the binding member is made of a stranded wire or a single wire.

Fig. 2 is a schematic diagram showing a brace attached to a building; 2 is a front view of the brace shown in FIG. 1; FIG. 2 is a plan view of the brace shown in FIG. 1; FIG. Figure 2 is a side view of the brace shown in Figure 1; FIG. 11 is a side view of another example of a brace; FIG. 6 is a side view of a stiffening member that constitutes the brace shown in FIG. 5; FIG. 11 is a side view of yet another example of a brace; FIG. 11 is a side view of yet another example of a brace;

Referring to Figure 1, a plurality of braces 10 and a portion of a building 12 to which they are applied are shown. The building 12 to which the brace 10 is applied does not matter whether it is a wooden structure or a structure other than a wooden structure, such as a reinforced concrete structure.

As shown in FIG. 1, a pair of braces 10 are arranged in each rectangular opening 18 defined by two columns 14 forming a building 12 and two upper and lower beams 16 connected to both columns 14 . Both braces 10 are connected at both ends (more specifically, both ends 24A of a core member 24 to be described later) and via a plurality of bolt and nut assemblies (not shown). It is fixed to one and the other of two brackets 20 attached to the lower beam 16 and one bracket 22 attached to the upper beam 16 and extends diagonally with respect to both columns 14 .

The brace 10 shown in FIGS. 2-4 comprises an elongated steel core member 24 having opposite ends 24A, two wooden stiffeners 26 sandwiching the core member 24 between the opposite ends 24A, and both stiffeners. 26 and one tie member 28 exerting a clamping force from their perimeter. Both stiffening members 26 extend in the longitudinal direction of the core member 24 and hold the core member 24 between the two stiffening members 26 .

The core member 24 and both stiffening members 26 are bound by a binding member 28 and thereby integrated. In the integrated core member 24 and stiffening members 26, the stiffening members 26 are arranged so that when the core member 24 is subjected to a tensile or compressive force in its longitudinal direction, the core member 24 and the stiffening members 26 are pulled together. It allows deformation in its longitudinal direction against the frictional force generated between

According to this, when the building 12 is subjected to an external force such as an earthquake force, the core member 24 of the brace 10 is subjected to tensile or compressive force in its longitudinal direction. Upon receiving the longitudinal force, the core member 24 deforms in its longitudinal direction and absorbs part of the seismic force. The stiffeners 26 constrain the core member 24 between them so that the core member 24 does not buckle when subjected to compressive forces.

In the illustrated example, the core member 24 is made of a flat plate and has a strip shape as a whole. Each end 24A of the core member 24 is provided with a plurality of bolt holes 29 through which the bolt and nut assembly is passed.

The stiffening member 26 preferably has a peripheral surface 26a which is a portion of a cylindrical surface. The stiffening member 26 shown in the figure is formed of a semi-cylindrical body which is a half-split wooden body having a cylindrical shape, has a semi-circular cross-sectional shape, and has a semi-cylindrical peripheral surface 26a (see FIG. 4). The illustrated stiffening member 26 has a length corresponding to the distance between the two end portions 24A of the core member 24, and has an elongated rectangular flat surface 26b that defines its cross-sectional shape. The stiffening member 26 is in contact with one side 24a of the core member 24 at its flat surface 26b. Preferably, the one side 24a of the core member 24 and the flat side 26b of the stiffening member 26 are in contact with each other via an unbonding material (not shown) such as grease applied to them. The unbonded material acts as an anti-friction material for both stiffening members 26 of core member 24 .

In the illustrated example, the width dimension of the flat surface 26b of the stiffening member 26 (the diameter of the cylindrical body) is larger than the width dimension of the core member 24, that is, the interval between the side surfaces 24b of the core member 24. As shown in FIG. As another example instead of the illustrated example, the width dimension of the flat surface 26b of the stiffening member 26 and the width dimension of the core member 24 can be equal. In either example, both stiffening members 26 sandwich and hold the core member 24 between these end portions 24A. In the illustrated example, the flat surfaces 26b of both stiffening members 26 are arranged to face each other. Instead of the illustrated example, the stiffening member 26 may be made of a prismatic wood half-split body such as a regular hexagon or a regular octagon, and may have a peripheral surface with a square cross-sectional shape. .

The binding member 28 is, for example, an elongated strip made of steel, synthetic resin, or the like, or a stranded or single wire made of steel, fiber-reinforced plastic (FRP), nylon, or the like. A binding member 28 is spirally wound around both stiffening members 26 . According to this, both stiffening members 26 receive a substantially uniform tightening force from their periphery and at all points in their longitudinal direction. Thereby, the mutual spacing of both stiffening members 26 is maintained substantially constant over their entire length. For this reason, the binding ability of both stiffening members 26 to the core member 24 is less likely to disappear.

Even if the core member 24 receives the compressive force and is bent, the binding member 28 is elongated and the space between the stiffening members 26 is widened. The elongation of 28 and the spread between the stiffeners 26 remains relatively small, allowing the restraint capability of both stiffeners 26 to be maintained. Furthermore, since the core member 24 is subjected to a substantially uniform tightening force at all locations in the longitudinal direction by both stiffening members 26, the amount of deflection that may occur in the core member 24 is It can be substantially equal at any point in the longitudinal direction, thereby preventing the occurrence of excessively large deflection and the accompanying buckling.

Both stiffening members 26 may have grooves 30 extending spirally around them. The binding member 28 extends within and along the groove 30 . Further, the interior of the groove 30 can be filled with a synthetic resin adhesive (not shown) to bury the binding member 28 in the groove 30 .

The core member 24 may have, for example, a cruciform cross-sectional shape, as shown in FIG. 5, instead of the example shown in FIG. The core member 24 having a cruciform cross-sectional shape is composed of a flat plate portion 32 corresponding to the flat plate shown in FIG. . Both illustrated upright plate portions 34 each have the same thickness dimension as plate portion 32 and have a rectangular cross-sectional shape. Both upright plate portions 34 are received in two grooves 36 (see FIG. 6) provided in both stiffening members 26 sandwiching the flat plate portion 32 and open to the flat surfaces 26b of both stiffening members 26, respectively. The groove 36 has the same cross-sectional shape as the upright plate portion 34 , and the upright plate portion 34 is in contact with the wall surface defining the groove 36 .

4 and other portions of the core member 24 connected to the ends (parts between the ends 24A) are the same as those shown in FIG. cruciform cross-sectional shape (not shown). In this example, each stiffening member 26 is provided with a groove (not shown) similar to groove 36 shown in FIG.

The number of stiffening members 26 can be three or more instead of the two examples shown in FIGS. For example, one side and the other side of the semi-cylindrical stiffening members 26 shown in FIG. can be done. These quadrant stiffening members 26 each have a peripheral surface 26a consisting of a quadrant cylindrical surface.

These four quadrant stiffening members 26, as shown in FIG. It can be used as something to be sandwiched and held by the upright plate portion 34 .

The number of stiffening members 26 can be one, as shown in FIG. 8, in place of the above-described example in which a plurality of stiffening members 26 are provided. The one stiffening member 26 shown in the figure has a generally cylindrical shape and has a groove 38 open to its peripheral surface 26a. The grooves 38 extend from one end of the stiffening member 26 to the other. The illustrated groove 38 has a depth larger than the width of the core member 24 made of the belt-like flat plate, and has a width (groove width) slightly larger than the thickness of the core member 24 . Stiffening member 26 receives and retains core member 24 within groove 38 thereof. Therefore, the peripheral surface 26a of the stiffening member 26 in this example consists of a portion of the cylindrical surface excluding a portion corresponding to the width of the groove 38 (groove width).

Further, the number of the binding members 28 may be changed to one in the illustrated example, and another example (not shown) in which the number is two or more. In the other example, the plurality of binding members 28 are wound in forward winding (that is, from one end to the other of both ends 24A of the core member 24) at intervals in the longitudinal direction of the stiffening member 26. Alternatively, it is wound in the forward and reverse windings (that is, from the other to the one of both end portions 24A of the core member 24) and crosses each other. Further, in the other example, the same number of grooves 30 as the plurality of binding members 28 may be provided, and each binding member 28 may extend within each groove 30 . Further, the inside of each groove 30 can be filled with the synthetic resin adhesive, and each binding member 28 can be buried in each groove 30 .

10 Brace 12 Building 24 Core member 24A End 26 Stiffening member 28 Binding member 30 Groove

Claims (10)

an elongated steel core member having opposite ends;
a stiffening member of wood extending longitudinally of said core member for holding said core member between its ends;
one or more binding members spirally wrapped around the stiffening member to exert a clamping force on the stiffening member from around the stiffening member;
The core member is made of a flat plate,
The first stiffening member has a groove which is open to the peripheral surface of the stiffening member and has a depth greater than the width of the core member, and receives the core member between its ends within the groove, The brace that holds the an elongated steel core member having opposite ends;
two stiffening members of wood extending longitudinally of said core member holding said core member between its ends;
one or more binding members spirally wrapped around the stiffening member to exert a clamping force on the stiffening member from around the stiffening member;
The core member comprises a flat plate portion and two upright plate portions extending from both sides of the flat plate portion, and has a cross-shaped cross-sectional shape,
the two stiffening members each have an elongated flat surface extending in the longitudinal direction of the core member and a groove opening into the flat surface;
One of the stiffening members is in contact with one side of the flat plate portion on the flat surface and receives one of the upright plate portions in the groove, and the other stiffening member is on the flat surface on the other side of the flat plate portion. Contacting one side and receiving the other upright plate portion in the groove, the two stiffening members sandwich the flat plate portion at a distance from each other to hold the core member between its ends . , braces. an elongated steel core member having opposite ends;
four stiffening members made of wood extending longitudinally of the core member to hold the core member between its ends;
one or more binding members spirally wrapped around the stiffening member to exert a clamping force on the stiffening member from around the stiffening member;
The core member comprises a flat plate portion and two upright plate portions extending from both sides of the flat plate portion, and has a cross-shaped cross-sectional shape,
A brace, wherein the four stiffening members hold the core member between its ends by sandwiching the flat plate portion and the two upright plate portions, respectively. The brace according to any one of claims 1 to 3 , wherein the plurality of binding members are forwardly wound at intervals. The brace according to any one of claims 1 to 3 , wherein the plurality of binding members are wound forward and reverse so as to cross each other. The stiffening member has the same number of grooves as the binding members extending spirally around the stiffening member, and the binding members extend within the grooves . A brace according to paragraph 1. 7. The brace of claim 6 , including a synthetic resin adhesive that fills the grooves and embeds the binding members within the grooves. The brace according to any one of claims 1 to 7 , wherein the core member and the stiffening member are in contact with each other via an unbonded material. A brace according to any one of claims 1 to 8 , wherein the stiffening member has a peripheral surface consisting of a portion of a cylindrical surface. A brace according to any one of claims 1 to 9, wherein the binding member consists of a stranded wire or a single wire.

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