CN104198306B - A kind of dynamic drawing experimental provision impacted under active confined pressure and experimental technique - Google Patents
A kind of dynamic drawing experimental provision impacted under active confined pressure and experimental technique Download PDFInfo
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- CN104198306B CN104198306B CN201410387344.2A CN201410387344A CN104198306B CN 104198306 B CN104198306 B CN 104198306B CN 201410387344 A CN201410387344 A CN 201410387344A CN 104198306 B CN104198306 B CN 104198306B
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Abstract
The invention discloses a kind of dynamic drawing experimental provision impacted under active confined pressure and experimental technique, mass freely falling body is acted on the dynamic impulsion pressure on impact target and is converted into the dynamic pulling capacity acting on reinforced concrete and the most actively confined pressure power being applied on test specimen sidewall by the present invention, lever principle is utilized to be applied on test specimen side by impact dynamic loads, reinforcing bar is applied dynamic pulling capacity simultaneously, study under this impact confined pressure and dynamic pulling capacity act on simultaneously, the distribution of the solid bond stress of reinforced concrete anchors, comparative analysis can be done by bond stress distribution solid with the reinforced concrete anchors under passive confined pressure and under constant active confined pressure；And the LOADING RATES of confined pressure can be changed by adjusting steel wire rope position in lever parallel arms, thus the anchorage bond stress distribution under different confined pressure LOADING RATES and the failure mode of test specimen can be studied.
Description
Technical field
The present invention relates to a kind of dynamic drawing experimental provision impacted under active confined pressure and experimental technique, be specifically related to simultaneously under impact active confined pressure and dynamic pulling capacity act on, the experimental provision of the solid bond stress distribution of reinforced concrete anchors and experimental technique.
Background technology
The bonding of reinforcing bar and concrete is the interaction of a kind of complexity between reinforcing bar and peripheral concrete, it is the composite component that bi-material the is formed premise that is able to work, typically the shear stress produced along reinforcing bar and concrete surface after armored concrete stress is defined as bond stress.According to bond stress distribution feature, anchorage bond stress and crack gaps bond stress typically can be classified as.What the paper " Rc Structure Bond performance and the research of durability " that nineteen ninety Xu has the paper " deformed bar concrete binding anchoring property experimental study " of neighbour, calendar year 2001 Zhao Yu to practise was studied is the solid adhesive property of the reinforced concrete anchors under semi-static load effect, and the latter considers the reinforcing bar impact on adhesive property of getting rusty；What the paper " Corrosion Reinforcement and concrete dynamic adhesion performance study " of Zheng Xiao swallow in 2004 was studied is the solid adhesive property of the reinforced concrete anchors under circulation triangular pulse (simulation earthquake load) loading effect；For a lot of reinforced concrete structures under blast load or ballistic impact load effect, before armored concrete bonding failure, the stress state of concrete changes greatly owing to thump load action all there occurs.It is true that the destruction of a lot of reinforced concrete structures is all affected by suddenly Strong Impact Loading effect, these structures to be carried out finite element analysis, armored concrete under different stress the research of dynamic adhesion stress distribution just seem particularly important.
Summary of the invention
It is desirable to provide a kind of dynamic drawing experimental provision impacted under active confined pressure, the anchorage bond stress distribution of armored concrete under research impact actively confined pressure effect, present invention application is dropped hammer and is obtained dynamic impulsion load, and it is translated into the dynamic force of drawing reinforcing bar and the most actively confined pressure power being applied on test specimen, change the relations of distribution of two kinds of power by adjusting the link position of the second steel wire rope, study the anchorage bond stress distribution of armored concrete under different confined pressures and different pulling capacity.
The invention provides a kind of dynamic drawing experimental provision impacted under actively confined pressure, including dropping hammer, test specimen, measurement apparatus, impact load transfer device, confining pressure device, it is characterised in that drop hammer as impact mass block described in:, do the movement of falling object along vertical rail；Described test specimen is the armored concrete test specimen of cylindrical structure, and test specimen center is reinforcing bar；Described measurement apparatus includes force snesor, metal strain plate sensor and oil pressure sensor, metal clad strain-ga(u)ge transducer in the reinforcing bar at described test specimen center；Described impact load transfer device includes impact target, guide rail, steel wire rope, leverage, drop hammer applying dynamic load on impact target, impact target runs on upright guide rail, guide rail is fixed on base, fixed pulley is fixed on pedestal, and pedestal includes two pieces of risers, connects one piece of crossbeam between two pieces of risers；Described leverage includes lever arm, shaft core, first steel wire rope one end connects impact target, the other end is walked around fixed pulley and is sequentially connected with movable pulley, force snesor and connecting plate, connecting plate is provided with hole, the connecting plate other end is connected with reinforcing bar, the first regulation bolt it is provided with between first steel wire rope and connecting plate, when making loading original state, movable pulley and the second steel wire rope are tangent, second steel wire rope connects lever arm, the second regulation bolt it is provided with in one end of the second steel wire rope, for applying confined pressure prestressing force, shaft core is the center of rotation of two lever arms, shaft core is welded on the crossbeam of pedestal, connecting plate is enclosed within shaft core and on the disk at lever rotation center, it is provided with steel ball between the other end and the confined pressure piston of lever；Described confining pressure device is rectangular structure, confining pressure device includes oil pressure chamber and inner cavity chamber, the outer wall of oil pressure chamber is rectangular structure, and inner cavity chamber is positioned at the center of oil pressure chamber, and inner cavity chamber is cylindrical structure, inner cavity chamber is provided with rubber finger sleeve and fixes ring flat-plate, the centre of inner cavity chamber's left end panel is provided with hole, and the center line in hole is consistent with the axis of inner cavity chamber, and oil pressure chamber roof is provided with oil-in and exhaust outlet, being provided with oil pressure sensor in vent cap, oil pressure chamber two sides are provided with confined pressure piston；Inner cavity chamber is provided with test specimen, is provided with rubber finger sleeve outside test specimen, and the mid portion of rubber finger sleeve contacts with test specimen, and two ends are enclosed within rubber finger sleeve and fix on ring flat-plate, fixes being provided with collar outside ring flat-plate at rubber finger sleeve, and rubber finger sleeve two ends are fastened on ring flat-plate by the collar.
In above-mentioned experimental provision, described impact target is that piston type contacts with guide rail, guide rail is the rectangular structure of boring, steel wire rope is fixed at 1/3rd of distance impact target top, impact target is provided with contiguous block, and the hole on steel wire penetrating contiguous block is connected with impact target, and it is 0-5cm that impact target runs altitude range, impact target traffic direction on guide rail is paralleled with the guide rail that drops hammer, and one end that guide rail contacts with impact target contiguous block is provided with groove.
In above-mentioned experimental provision, described confining pressure device is made up of casing and case lid, and casing is upper and lower open-close type, and case lid is bolted on casing, and casing is fixed on pedestal；Casing and case lid junction are provided with a circle rubber ring.
In above-mentioned experimental provision, described connecting plate is enclosed within disk and the shaft core of lever central, and can be movable thereon, connecting plate one end connects the first steel wire rope, the other end is connected with reinforcing bar, and impact pulling capacity is delivered on reinforcing bar by connecting plate, it is achieved the impact drawing to armored concrete anchoring reinforcing bar.
In above-mentioned experimental provision, described force snesor is high-precision force sensor, and metal strain plate sensor and oil pressure sensor are connected with high performance oscillograph.
In above-mentioned experimental provision, described movable pulley two ends are connected with the first steel wire rope, pulley inside groove and the contact of the second steel wire rope, and the dynamic impact forces that impact target produces is decomposed into the power of drawing reinforcing bar and applies the power of confined pressure by movable pulley.
In above-mentioned experimental provision, described second steel wire rope is connected on the lever arm of lever, by regulating second steel wire rope position along lever arm, thus controls to impact the size of confined pressure power, and the second steel wire rope is the biggest the closer to confined pressure LOADING RATES during lever rotation axle center.
In above-mentioned experimental provision, described lever arm pulls it to rotate by the second steel wire rope, and dynamic force is delivered on confined pressure piston by the other end of lever.
The invention provides a kind of dynamic drawing experimental technique impacted under active confined pressure, comprise the following steps:
(1) test specimen is fixed on inner cavity chamber, connects reinforcing bar and connecting plate, apply by the second regulation bolt and record prestressing force after filling oil in oil pressure chamber；
(2) impact mass block impacts on impact target with certain altitude freely falling body, steel wire rope becomes the dynamic tensile load being applied on reinforcing bar and the impact acting in surface of test piece actively confined pressure power the dynamic pressure load conversion on impact target, the power of drawing reinforcing bar, the pressure size of concrete sample surface applying and the strain of reinforcing bar is measured respectively by force snesor, oil pressure sensor and metal strain plate sensor, thus along the dynamic stress distribution situation of anchorage length when obtaining dynamically drawing reinforcing bar under impact actively confined pressure；
(3) regulation mass release altitude, repeat the above steps, can study the LOADING RATES impact on armored concrete dynamic adhesion stress distribution.
Further, described experimental technique, comprise the following steps:
A, opening confining pressure device case lid, from casing right-hand member, test specimen is put into inner cavity chamber, the reinforcing bar of test specimen front end is through the circular hole on casing front end-plate, and the left side of test specimen abuts against on the inwall of casing；
B, launching to be fixed on concrete sample by rubber finger sleeve, two ends are enclosed within rubber finger sleeve and fix on ring flat-plate, and with collar, rubber finger sleeve are fixed on rubber finger sleeve and fix on ring flat-plate；
C, with bolt, case lid is fixed on casing, for the rubber ring pad that seals at casing and the contact surface of case lid；
D, connect end reinforced and connecting plate；
E, open exhaust outlet, by oil-in to oil pressure chamber oiling, treat that oil fills vent cap and oil-feed lid on bonnet.
F, inspection force snesor, metal strain plate sensor and oil pressure sensor connect the most normal with corresponding oscillograph；
G, according to planning of experiments, regulate second steel wire rope position along lever arm, regulation the second regulation bolt, apply confined pressure prestressing force, and record structural initial pre stress value；Adjust the first regulation bolt so that when the first steel wire rope is tight, second steel wire rope is tangent with fixed pulley simultaneously；
H, lifting are dropped hammer to specified altitude assignment, release, record data: force snesor records drop impact drawing reinforcing bar power；Regulating second steel wire rope position on lever arm thus adjust the size of impact confined pressure power, metal strain plate sensor records the strain of reinforcing bar；Oil pressure sensor is recorded in impact process, the confined pressure size being applied on test specimen；
I, derivation oscilloscope data, change test specimen；
J, regulation mass release altitude, repeat the above steps, study the LOADING RATES impact on armored concrete dynamic adhesion stress distribution.
The dynamic impulsion pressure that mass freely falling body is acted on impact target by the present invention passes through load transfer device, it is converted into the dynamic pulling capacity acting on reinforced concrete and the most actively confined pressure power being applied on test specimen sidewall: utilize lever principle to be applied on test specimen side by impact dynamic loads, reinforcing bar is applied dynamic pulling capacity simultaneously, study under this impact confined pressure and dynamic pulling capacity act on simultaneously, the distribution of the solid bond stress of reinforced concrete anchors, comparative analysis can be done by bond stress distribution solid with the reinforced concrete anchors under passive confined pressure and under constant active confined pressure；And the LOADING RATES of confined pressure can be changed by adjusting steel wire rope position in lever parallel arms, thus the anchorage bond stress distribution under different confined pressure LOADING RATES and the failure mode of test specimen can be studied.
The present invention'sBeneficial effect:
(1) invention utilizes impact target, steel wire rope, fixed pulley, movable pulley and lever, act on the impact load on target body dexterously by dropping hammer and be converted into the impact actively confined pressure being applied to concrete sample side and the dynamic pulling capacity being applied on reinforcement in concrete, it is achieved thereby that the dynamic drawing experiment that armored concrete is under impact actively confined pressure；
(2) present invention utilizes oil gear, efficiently solves the problem of concrete generation cleavage fracture in the dynamic drawing process of armored concrete；
(3) present invention utilizes oil gear and lever principle, achieve the loading of impact actively confined pressure, and utilizing pressure sensor to record the change of confined pressure in loading procedure, the time-history curves of time-history curves and pulling capacity by comparing confined pressure can analyze the confined pressure impact on armored concrete bond-slip quantitatively；
(4) present invention utilizes movable pulley, lever principle and oil gear dexterously, the dynamic drawing achieved under impact actively confined pressure loads, armored concrete residing stress state before occurring bond-slip to lose efficacy more is consistent with reality, the bonding-slip relationship studied will with the fact closer to, reinforced concrete structure is had certain Engineering Guidance meaning at anti-explosion design.
Accompanying drawing explanation
Fig. 1 is the front view of apparatus of the present invention.
Fig. 2 is the top view of Fig. 1.
Fig. 3 be in Fig. 1 confining pressure device along the sectional view of line A-A.
In figure, 1 for dropping hammer, 2 is impact target, 3 is guide rail, 4 is fixed pulley, 5 is movable pulley, 6 is the first steel wire rope, 7 is the second steel wire rope, 8 is connecting plate, 9 is lever arm, 10 is shaft core, 11 is case lid, 12, for casing, 13 is rubber ring, 14 is rubber finger sleeve, 15 fix ring flat-plate for rubber finger sleeve, 16 is the collar, 17 is reinforcing bar, 18 is test specimen, 19 is oil-in, 20, for exhaust outlet, 21 is confined pressure piston, 22 is oil pressure chamber, 23 is force snesor, 24 is metal strain plate sensor, 25 is oil pressure sensor, 26 is the first regulation bolt, 27 is the second regulation bolt, 28 is pedestal, 29 is base, 30 is crossbeam.
Detailed description of the invention
Further illustrate the present invention below by embodiment, but be not limited to following example.
Embodiment:
First compare Fig. 1 ~ 3 illustrate experimental provision of the present invention structure:
A kind of dynamic drawing experimental provision impacted under actively confined pressure, including dropping hammer, test specimen, measurement apparatus, impact load transfer device, confining pressure device, it is characterised in that drop hammer 1 for impact mass block described in:, do the movement of falling object along vertical rail；Described test specimen 18 is the armored concrete test specimen of cylindrical structure, and test specimen 18 center is reinforcing bar 17；
Described measurement apparatus includes force snesor 23, metal strain plate sensor 24 and oil pressure sensor 25, metal clad strain-ga(u)ge transducer 24 in the reinforcing bar 17 at described test specimen center；
Described impact load transfer device includes impact target 2, guide rail 3, steel wire rope, leverage, drop hammer applying dynamic load on impact target, impact target 2 runs on upright guide rail 3, guide rail 3 is fixed on base 29, fixed pulley 4 is fixed on pedestal 28, pedestal 28 includes two pieces of risers, connects one piece of crossbeam 30 between two pieces of risers；Described leverage includes lever arm 9, shaft core 10, first steel wire rope 6 one end connects impact target 2, the other end is walked around fixed pulley 4 and is sequentially connected with movable pulley 5, force snesor 23 and connecting plate 8, connecting plate 8 is provided with hole, connecting plate 8 other end is connected with reinforcing bar 17, the first regulation bolt 26 it is provided with between first steel wire rope 6 and connecting plate 8, when making loading original state, movable pulley 5 is tangent with the second steel wire rope 7, second steel wire rope 7 connects lever arm 9, it is provided with the second regulation bolt 27 in one end of the second steel wire rope 7, for applying confined pressure prestressing force, shaft core 10 is the center of rotation of two lever arms 9, shaft core 10 is welded on the crossbeam 30 of pedestal 28, connecting plate 8 is enclosed within the disk at shaft core 10 and lever rotation center, it is provided with steel ball between the other end and the confined pressure piston 21 of lever；
Described confining pressure device is rectangular structure, confining pressure device includes oil pressure chamber and inner cavity chamber, the outer wall of oil pressure chamber is rectangular structure, inner cavity chamber is positioned at the center of oil pressure chamber, inner cavity chamber is cylindrical structure, inner cavity chamber is provided with rubber finger sleeve and fixes ring flat-plate 15, the centre of inner cavity chamber's left end panel is provided with hole, the center line in hole is consistent with the axis of inner cavity chamber, oil pressure chamber roof is provided with oil-in and 19 exhaust outlets 20, oil pressure chamber two sides are provided with confined pressure piston 21, and exhaust outlet 20 covers and is provided with oil pressure sensor 25；Inner cavity chamber is provided with test specimen 18, being provided with rubber finger sleeve 14 outside test specimen 18, the mid portion of rubber finger sleeve 14 contacts with test specimen 18, and two ends are enclosed within rubber finger sleeve and fix on ring flat-plate 15, fixing at rubber finger sleeve and be provided with collar 16 outside ring flat-plate 15, rubber finger sleeve 14 two ends are fastened on ring flat-plate by the collar 16.
Described impact target 2 contacts for piston type with guide rail 3, guide rail 3 is the rectangular structure of boring, first steel wire rope is fixed at 1/3rd of distance impact target 2 top, impact target 2 is provided with contiguous block, hole on steel wire penetrating contiguous block is connected with impact target, it is 0-5cm that impact target 2 runs altitude range, and impact target 2 traffic direction on guides 3 is paralleled with the guide rail that drops hammer, and one end that guide rail 3 contacts with impact target 2 contiguous block is provided with groove.
Described confining pressure device is made up of casing 12 and case lid 11, and casing 12 is upper and lower open-close type, and case lid 11 is bolted on casing 12, and casing 12 is fixed on pedestal 28；Casing 12 and case lid 11 junction are provided with a circle rubber ring 13.
Described connecting plate 8 is enclosed within disk and the shaft core 10 of lever central, and can be movable thereon, connecting plate 8 one end connects the first steel wire rope 6, and the other end is connected with reinforcing bar 17, impact pulling capacity is delivered on reinforcing bar 17 by connecting plate 8, it is achieved the impact drawing to armored concrete anchoring reinforcing bar.
Described force snesor 23 is high-precision force sensor, and metal strain plate sensor 24 and oil pressure sensor 25 are connected with high performance oscillograph.
Described movable pulley 5 two ends are connected with the first steel wire rope 6, and movable pulley 5 inside groove and the second steel wire rope 7 contact, and the dynamic impact forces that impact target 2 produces is decomposed into the power of drawing reinforcing bar and applies the power of confined pressure by movable pulley 5.
Described second steel wire rope 7 is connected on the lever arm 9 of lever, by regulating second steel wire rope 7 position along lever arm 9, thus controls to impact the size of confined pressure power, and the second steel wire rope 7 is the biggest the closer to confined pressure LOADING RATES during lever rotation shaft core.
Described lever arm 9 pulls it to rotate by the second steel wire rope 7, and dynamic force is delivered on confined pressure piston 21 by the other end of lever.
The following detailed description of the present invention dynamic drawing experimental technique:
A kind of dynamic drawing experimental technique impacted under active confined pressure, it is characterised in that: comprise the following steps:
(1) test specimen is fixed on inner cavity chamber, connects reinforcing bar and connecting plate, apply by the second regulation bolt and record prestressing force after filling oil in oil pressure chamber；Concretely comprise the following steps:
A, opening confining pressure device case lid 11, from casing 12 right-hand member, test specimen 18 is put into inner cavity chamber, the reinforcing bar 17 of test specimen 18 front end is through the circular hole on casing 12 front end-plate, and the left side of test specimen 18 abuts against on the inwall of casing 12；
B, launching to be fixed on concrete sample 18 by rubber finger sleeve 14, two ends are enclosed within rubber finger sleeve and fix on ring flat-plate 15, and with collar 16, rubber finger sleeve 14 are fixed on rubber finger sleeve and fix on ring flat-plate 15；
C, with bolt, case lid 11 is fixed on casing 12, pads at casing 12 and the contact surface of case lid 11 for the rubber ring 13 sealed；
D, connection reinforcing bar 17 end and connecting plate 8；
E, open exhaust outlet 19, by oil-in 20 to oil pressure chamber 22 oiling, treat that oil fills vent cap and oil-feed lid on bonnet.
F, inspection force snesor 23, metal strain plate sensor 24 and oil pressure sensor 25 connect the most normal with corresponding oscillograph；
G, according to planning of experiments, regulate second steel wire rope 7 position along lever arm 9, regulation the second regulation bolt 27, apply confined pressure prestressing force, and record structural initial pre stress value.Adjust the first regulation bolt 26 so that when the first steel wire rope 6 is tight, second steel wire rope 7 is tangent with fixed pulley 4 simultaneously；
(2) impact mass block impacts on impact target with certain altitude freely falling body, steel wire rope becomes the dynamic tensile load being applied on reinforcing bar and the impact acting in surface of test piece actively confined pressure power the dynamic pressure load conversion on impact target, the power of drawing reinforcing bar, the pressure size of concrete sample surface applying and the strain of reinforcing bar is measured respectively by force snesor, oil pressure sensor and metal strain plate sensor, thus along the dynamic stress distribution situation of anchorage length when obtaining dynamically drawing reinforcing bar under impact actively confined pressure；Concretely comprise the following steps:
H, promote and drop hammer 1 to specified altitude assignment, release, record data: force snesor records drop impact drawing reinforcing bar power；Regulating second steel wire rope position on lever arm thus adjust the size of impact confined pressure power, metal strain plate sensor records the strain of reinforcing bar；Oil pressure sensor is recorded in impact process, the confined pressure size being applied on test specimen.
I, derivation oscilloscope data, change test specimen；
(3) regulation mass release altitude, repeat the above steps, can study the LOADING RATES impact on armored concrete dynamic adhesion stress distribution.
Claims (10)
1. impact the dynamic drawing experimental provision under actively confined pressure, including dropping hammer, test specimen, measurement apparatus, impact load transfer device, confining pressure device, it is characterised in that:
Described drop hammer as impact mass block, do the movement of falling object along vertical rail；
Described test specimen is the armored concrete standard specimen of cylindrical structure, a diameter of 150mm, a height of 300mm, and test specimen center is reinforcing bar；
Described measurement apparatus includes force snesor, metal strain plate sensor and oil pressure sensor, metal clad strain-ga(u)ge transducer in the reinforcing bar at described test specimen center；
Described impact load transfer device includes impact target, guide rail, steel wire rope, leverage, drop hammer applying dynamic load on impact target, impact target runs on upright guide rail, guide rail is fixed on base, fixed pulley is fixed on pedestal, and pedestal includes two pieces of risers, connects one piece of crossbeam between two pieces of risers；Described leverage includes lever arm, shaft core, first steel wire rope one end connects impact target, the other end is walked around fixed pulley and is sequentially connected with movable pulley, force snesor and connecting plate, connecting plate is provided with hole, the connecting plate other end is connected with reinforcing bar, the first regulation bolt it is provided with between first steel wire rope and connecting plate, when making loading original state, movable pulley and the second steel wire rope are tangent, second steel wire rope connects lever arm, the second regulation bolt it is provided with in one end of the second steel wire rope, for applying confined pressure prestressing force, shaft core is the center of rotation of two lever arms, shaft core is welded on the crossbeam of pedestal, connecting plate is enclosed within the disk at shaft core and lever rotation center, it is provided with steel ball between the other end and the confined pressure piston of lever；
Described confining pressure device is rectangular structure, confining pressure device includes oil pressure chamber and inner cavity chamber, the outer wall of oil pressure chamber is rectangular structure, and inner cavity chamber is positioned at the center of oil pressure chamber, and inner cavity chamber is cylindrical structure, inner cavity chamber is provided with rubber finger sleeve and fixes ring flat-plate, the centre of inner cavity chamber's left end panel is provided with hole, and the center line in hole is consistent with the axis of inner cavity chamber, and oil pressure chamber roof is provided with oil-in and exhaust outlet, being provided with oil pressure sensor in vent cap, oil pressure chamber two sides are provided with confined pressure piston；Inner cavity chamber is provided with test specimen, is provided with rubber finger sleeve outside test specimen, and the mid portion of rubber finger sleeve contacts with test specimen, and rubber finger sleeve two ends are enclosed within rubber finger sleeve and fix on ring flat-plate, fixes being provided with collar outside ring flat-plate at rubber finger sleeve, and rubber finger sleeve two ends are fastened on ring flat-plate by the collar.
Dynamic drawing experimental provision under impact the most according to claim 1 actively confined pressure, it is characterized in that: described impact target is that piston type contacts with guide rail, guide rail is the rectangular structure of boring, steel wire rope is fixed at 1/3rd of distance impact target top, impact target is provided with contiguous block, hole on steel wire penetrating contiguous block is connected with impact target, it is 0-5cm that impact target runs altitude range, impact target traffic direction on guide rail is paralleled with the guide rail that drops hammer, and one end that guide rail contacts with impact target contiguous block is provided with groove.
Dynamic drawing experimental provision under impact the most according to claim 1 actively confined pressure, it is characterised in that: described confining pressure device is made up of casing and case lid, and casing is upper and lower open-close type, and case lid is bolted on casing, and casing is fixed on pedestal；Casing and case lid junction are provided with a circle rubber ring.
Dynamic drawing experimental provision under impact the most according to claim 1 actively confined pressure, it is characterized in that: described connecting plate is enclosed within disk and the shaft core of lever central, and can be movable thereon, connecting plate one end connects the first steel wire rope, the other end is connected with reinforcing bar, impact pulling capacity is delivered on reinforcing bar by connecting plate, it is achieved the impact drawing to armored concrete anchoring reinforcing bar.
Dynamic drawing experimental provision under impact the most according to claim 1 actively confined pressure, it is characterised in that: described force snesor is high-precision force sensor, and metal strain plate sensor and oil pressure sensor are connected with high performance oscillograph.
Dynamic drawing experimental provision under impact the most according to claim 1 actively confined pressure, it is characterized in that: described movable pulley two ends are connected with the first steel wire rope, pulley inside groove and the contact of the second steel wire rope, the dynamic impact forces that impact target produces is decomposed into the power of drawing reinforcing bar and applies the power of confined pressure by movable pulley.
Dynamic drawing experimental provision under impact the most according to claim 1 actively confined pressure, it is characterized in that: described second steel wire rope is connected on the lever arm of lever, by regulating second steel wire rope position along lever arm, thus controlling to impact the size of confined pressure power, the second steel wire rope is the biggest the closer to confined pressure LOADING RATES during lever rotation axle center.
Dynamic drawing experimental provision under impact the most according to claim 1 actively confined pressure, it is characterised in that: described lever arm pulls it to rotate by the second steel wire rope, and dynamic force is delivered on confined pressure piston by the other end of lever.
9. impact the dynamic drawing experimental technique under active confined pressure, use the dynamic drawing experimental provision under the actively confined pressure of the impact described in any one of claim 1 ~ 8, it is characterised in that: comprise the following steps:
(1) test specimen is fixed on inner cavity chamber, reinforcing bar is connected with connecting plate, apply by the second regulation bolt and record prestressing force after filling oil in oil pressure chamber；
(2) impact mass block impacts on impact target with certain altitude freely falling body, steel wire rope becomes the dynamic tensile load being applied on reinforcing bar and the impact acting in surface of test piece actively confined pressure power the dynamic pressure load conversion on impact target, the power of drawing reinforcing bar, the pressure size of concrete sample surface applying and the strain of reinforcing bar is measured respectively by force snesor, oil pressure sensor and metal strain plate sensor, thus along the dynamic stress distribution situation of anchorage length when obtaining dynamically drawing reinforcing bar under impact actively confined pressure；
(3) regulation mass release altitude, repeat the above steps, can study the LOADING RATES impact on armored concrete dynamic adhesion stress distribution.
Dynamic drawing experimental technique under impact the most according to claim 9 actively confined pressure, it is characterised in that: comprise the following steps:
A, opening confining pressure device case lid, from casing right-hand member, test specimen is put into inner cavity chamber, the reinforcing bar of test specimen front end is through the circular hole on casing front end-plate, and the left side of test specimen abuts against on the inwall of casing；
B, launching to be fixed on concrete sample by rubber finger sleeve, two ends are enclosed within rubber finger sleeve and fix on ring flat-plate, and with collar, rubber finger sleeve are fixed on rubber finger sleeve and fix on ring flat-plate；
C, with bolt, case lid is fixed on casing, for the rubber ring pad that seals at casing and the contact surface of case lid；
D, connect end reinforced and connecting plate；
E, open exhaust outlet, by oil-in to oil pressure chamber oiling, treat that oil fills vent cap and oil-feed lid on bonnet；
F, inspection force snesor, metal strain plate sensor and oil pressure sensor connect the most normal with corresponding oscillograph；
G, according to planning of experiments, regulate second steel wire rope position along lever arm, regulation the second regulation bolt, apply confined pressure prestressing force, and record structural initial pre stress value；Adjust the first regulation bolt so that when the first steel wire rope is tight, second steel wire rope is tangent with fixed pulley simultaneously；
H, lifting are dropped hammer to specified altitude assignment, release, record data: force snesor records drop impact drawing reinforcing bar power；Regulating second steel wire rope position on lever arm thus adjust the size of impact confined pressure power, metal strain plate sensor records the strain of reinforcing bar；Oil pressure sensor is recorded in impact process, the confined pressure size being applied on test specimen；
I, derivation oscilloscope data, change test specimen；
J, regulation mass release altitude, repeat the above steps, study the LOADING RATES impact on armored concrete dynamic adhesion stress distribution.
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| JP4466431B2 (en) * | 2005-03-29 | 2010-05-26 | 富士通株式会社 | Impact test equipment |
| CN102169069B (en) * | 2011-05-30 | 2012-09-05 | 浣石 | Three-dimensional impact loading experiment device |
| CN202101910U (en) * | 2011-06-10 | 2012-01-04 | 中国矿业大学 | Triaxial impact dynamic load and dead load combined tester |
| CN102331366B (en) * | 2011-07-18 | 2012-10-24 | 河海大学 | Hopkinson bar active pressure confining device for stabilizing pressure |
| CN202720167U (en) * | 2012-05-15 | 2013-02-06 | 哈尔滨工程大学 | Impaction tension testing device |
| CN103134750A (en) * | 2013-02-01 | 2013-06-05 | 河海大学 | Steel bar drawing testing device suitable for Hopkinson pressure bar |
| CN103278404B (en) * | 2013-05-20 | 2015-06-03 | 洛阳理工学院 | Testing device and method for simulating deep rock mass impact failure |
| CN103852373A (en) * | 2014-03-20 | 2014-06-11 | 中国人民解放军理工大学 | Three-way confining pressure and temperature combined loading device for Hopkinson compression bar impact test |
-
2014
- 2014-08-08 CN CN201410387344.2A patent/CN104198306B/en not_active Expired - Fee Related
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| CN104198306A (en) | 2014-12-10 |
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