CN104181102B - A kind of experimental provision and experimental technique impacting tension-torsion loading - Google Patents
A kind of experimental provision and experimental technique impacting tension-torsion loading Download PDFInfo
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- CN104181102B CN104181102B CN201410387345.7A CN201410387345A CN104181102B CN 104181102 B CN104181102 B CN 104181102B CN 201410387345 A CN201410387345 A CN 201410387345A CN 104181102 B CN104181102 B CN 104181102B
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Abstract
The invention discloses a kind of experimental provision and the experimental technique that impact tension-torsion loading, belong to shock dynamics experiment field.This experimental provision comprise drop hammer, test specimen, impact load transfer device, load disk, measurement mechanism, test piece fixing device; Drop impact of dropping hammer transmission target, move in orbit after transmission target is impacted, base is provided with prestress charger, by regulating, screw thread is dry to be applied prestress on impact target, impact target both sides connect on loading disk respectively by wire rope, wire rope is provided with force snesor, and disk transmits tensile force and tension-torsion power on the reinforcing bar of test specimen, at the inner metal clad foil gauge of the reinforcing bar of test specimen for measuring the stress distribution along anchorage length of steel bar.The present invention have studied reinforced concrete anchoring reinforcing bar at the stretching withstood shocks and the bond stress distribution under reversing superimpose loads effect, for the constitutive relation of research anchoring bond slippage under complex stress effect establishes strong basis.
Description
Technical field
The present invention relates to and a kind ofly impact the experimental provision and experimental technique that tension-torsion loads, be specifically related to a kind of experimental provision and the experimental technique that impact the solid bond stress of reinforced concrete anchors under tension-torsion load action, belong to shock dynamics experiment field.
Background technology
Reinforcing bar and concrete bonding are the interactions of a kind of complexity between reinforcing bar and peripheral concrete, be the prerequisite that composite component that bi-material forms is able to work, generally stressed for the reinforced concrete rear shear stress along reinforcing bar and concrete surface produce be defined as bond stress.The reinforced concrete anchors done at present adheres knot stress analysis experimental study and is roughly divided into simple drawing experiment, dynamic drawing experiment and impact drawing experiment, and apply the above-mentioned experiment of confined pressure, and impact tension-torsion experiment almost do not have, for under the effect of impact tension-torsion load, the experimental data of reinforced concrete bond stress distribution quite lacks.In fact, the destruction of a lot of reinforced concrete structure is all be subject to suddenly impact loading, stress is very complicated, finite element analysis to be carried out to these structures, it is important that the dynamic adhesion stress distribution of reinforced concrete just seems particularly, and lay the foundation for the constitutive relation of research anchoring bond slippage under complex stress effect.
Summary of the invention
The present invention aims to provide a kind of experimental provision and the experimental technique that impact tension-torsion, two kinds of load modes are combined, application is dropped hammer and is obtained impact load, and be translated into tensile impact power and impact twisting resistance, in order to the dynamic adhesion performance of anchor bar when being subject to tensile impact and impact torsion of Study on Steel reinforced concrete.
The invention provides a kind of impact tension-torsion load experimental provision, it is characterized in that: it comprise drop hammer, test specimen, impact load transfer device, load disk, measurement mechanism, test piece fixing device, describedly to drop hammer as impact mass block, vertically do the movement of falling object, described test specimen is the reinforced concrete test specimen of rectangular structure, and test specimen center is provided with reinforcing bar, described impact load transfer device comprises impact target, guide rail, wire rope, fixed pulley, drop hammer and apply dynamic load on impact target, impact target runs on upright guide rail, impact target both sides are respectively equipped with columniform cantilever lever, the end of cantilever lever is provided with fan groove, guide rail both sides are provided with adjustment hole, cantilever lever passes from adjustment hole, cantilever lever can move up and down along adjustment hole, base is provided with prestress charger, prestress charger comprises iron plate and screw, threaded engagement is passed through in the hole at screw and iron plate center, the end of cantilever lever is contacted bottom screw, apply prestress on impact target cantilever lever by set screw, guide rail is fixed on base, fixed pulley is fixed on pedestal, described loading disk comprises wheel disc, the axis of rolling, the first rolling bearing, the second rolling bearing, dish core, wheel disc and the axis of rolling are structure as a whole, the axis of rolling is coaxial with wheel disc, wheel disc, the axis of rolling, dish core rotate around rolling bearing, be fixed on outside rolling bearing on pedestal, first wire rope is walked around the first fixed pulley and is connected with loading disk dish core by the cantilever lever of impact target side, second wire rope one end connects the cantilever lever of impact target opposite side, and the other end walks around the second fixed pulley and the 3rd fixed pulley is wound around and is connected on the wheel disc of loading disk, near the first wire rope side is the first rolling bearing, and the first rolling bearing is two-way bearing, and moving radially of restriction wheel disc moves forward with axial, and the second rolling bearing, near reinforcing bar side, controls the radial motion of wheel disc, dish core moves vertically or rotates around axle center in the axis of rolling, described measurement mechanism comprises force snesor, metal strain plate sensor, between 3rd fixed pulley and the wheel disc loading disk, the first force snesor is set, the second force snesor is provided with, at the inner metal clad strain-ga(u)ge transducer of the reinforcing bar of test specimen for measuring the stress distribution along anchorage length of steel bar between wire rope and dish core, the front console that described test piece fixing device comprises removable base plate and side plate and is fixed on pedestal, front console center is provided with circular hole, the axis of test specimen reinforcing bar and the center line of front end face plate hole and coil the dead in line of core, base plate and base into contact place are provided with studdle, studdle is welded on base plate, and side plate is bolted on base plate.
In such scheme, described impact target and guide rail are that piston type contacts, and guide rail is the rectangular structure of boring, and wire rope is fixed on the cantilever lever of impact target both sides, it is 0-5cm that impact target runs altitude range, and impact target traffic direction on guide rail falls direction and parallels with dropping hammer.
In such scheme, the cylinder plate core of described loading disk moves vertically or rotates around axle center in the axis of rolling; Described dish core is connected with the first wire rope, and dish core, along axis of rolling axially-movable, transmits tensile impact power; Described dish core is provided with two ribs, axis of rolling inwall is provided with two chutes, rib on dish core coordinates with the chute on the axis of rolling, band Moving plate core rotates, the wheel disc of described loading disk is connected with the second wire rope, second rope belt runner disc rotates, and wheel disc band Moving plate core rotates, and transmits and impacts twisting resistance; Described tensile impact power and impact twisting resistance by fixed pulley and wire rope transfers on the reinforcing bar of test specimen.
In such scheme, distance between the height of described base plate and biside plate is regulated by bolt, according to the size of test specimen, by the height of bolt regulating base board, the axis regulating the distance between two side plates to make the axis of test specimen reinforcing bar and the center line of front end face plate hole again and to coil core is on same straight line, the sidewall contact of side plate and test specimen, test specimen can not move.
In such scheme, the material of described impact mass block, guide rail, impact target, test specimen fixed case, fixed pulley, wheel disc and dish core is plow-steel, and described wire rope is twisted into by the finer wire with high strength.
In such scheme, the iron plate of described prestress charger is fixed on base, and iron plate is the n shape structure that top is arc plate, below is two rectangular parallelepiped plates; The arc plate center inside of iron plate is provided with hole, is provided with screw thread in hole, and screw inserts in iron plate hole above iron plate, coordinates with the screw thread in hole; Iron plate is above cantilever lever; Described prestress charger acts on the both sides of impact target respectively, arranges prestressed size by regulating the screw of upper end.
The invention provides a kind of experimental technique of above-mentioned experimental provision, comprise the following steps:
(1) test specimen is arranged in test specimen pickup groove, the height of regulating base board makes the axis of reinforcing bar and the axis being parallel of dish core, the side plate of described test piece fixing device is close to test specimen side and is fixed on base plate, reinforcing bar welds together with dish core, dish core is connected with wire rope, wire rope and dish core between be provided with the second force snesor, between wheel disc and the 3rd fixed pulley, the first force snesor is set, research be that dynamic tension-torsion load acts on the bond stress distribution of lower anchor bar in concrete simultaneously;
(2) impact mass block impacts on impact target with certain altitude freely falling body, wire rope becomes the dynamic pressure load conversion on impact target dynamic tensile load and dynamically reverses moment load to be applied on reinforcing bar, the reinforcing bar in reinforced concrete is made to be reversed drawing fast, power, the moment of flexure of test specimen on reinforcing bar of drawing reinforcing bar is measured respectively by force snesor and metal strain plate sensor, with reinforcing bar strain, thus the bond stress distribution of anchor bar in concrete under obtaining dynamic tension-torsion load action;
(3) quality of regulation block release altitude, repeats above-mentioned steps, can study the impact of LOADING RATES on reinforced concrete dynamic adhesion stress distribution.
Of the present invention
beneficial effect:
The present invention utilizes impact target, wire rope and fixed pulley, the dynamic impulsion pressure acted on by mass freely falling body on impact target converts to and is applied to dynamic pulling capacity on reinforcement in concrete and dynamic twisting resistance, thus achieve the dynamic impulsion tension-torsion experiment of reinforced concrete, the ease of Use impacted is realized in conjunction with dropping hammer;
The experimental technique that the impact pulling capacity that the present invention is formed under devising Impact Load is first combined with impact twisting resistance, pulling capacity and twisting resistance are delivered on reinforcing bar by the ingehious design loading disk simultaneously, synchronism while ensure that loading, in this and reality, the stress of reinforced concrete is more close.
Accompanying drawing explanation
Fig. 1 is the structural representation of experimental provision of the present invention.
Fig. 2 is the vertical view (without dropping hammer) of Fig. 1.
Fig. 3 is the left view (without dropping hammer) of Fig. 1.
Fig. 4 is the A direction view (broken section) of test piece fixing device in Fig. 1.
in figure1 for dropping hammer, 2 is impact target, 3 is guide rail, 4 is adjustment hole, 5 is cantilever lever, 6 is screw, 7 is iron plate, 8 is the first fixed pulley, 9 is the second fixed pulley, 10 is the 3rd fixed pulley, 11 is the first wire rope, 12 is the second wire rope, 13 is wheel disc, 14 is dish core, 15 is the first rolling bearing, 16 is the second rolling bearing, 17 is the first force snesor, 18 is the second force snesor, 19 is metal strain plate sensor, 20 is reinforced concrete test specimen, 21 is reinforcing bar, 22 is front console, 23 is base plate, 24 is side plate, 25 is studdle, 26 is side plate set bolt, 27 is bolt adjustment hole, 28 is pedestal, 29 is base.
Embodiment
Further illustrate the present invention below by embodiment, but be not limited to following examples.
Embodiment:
First the structure that Fig. 1 ~ 3 illustrate experimental provision of the present invention is contrasted:
Impact tension-torsion load an experimental provision, it comprise drop hammer, test specimen, impact load transfer device, load disk, measurement mechanism, test piece fixing device;
Describedly drop hammer 1 for impact mass block, vertically do the movement of falling object;
Described test specimen is the reinforced concrete test specimen 20 of rectangular structure, and test specimen center is provided with reinforcing bar 21;
Described impact load transfer device comprises impact target 2, guide rail 3, wire rope, fixed pulley, and fixed pulley comprises the first fixed pulley 8, second fixed pulley 9, the 3rd fixed pulley 10, and wire rope comprises the first wire rope 11 and the second wire rope 12, drop hammer 1 applying dynamic load on impact target 2, impact target 2 runs on upright guide rail 3, impact target 2 both sides are respectively equipped with columniform cantilever lever 5, the end of cantilever lever 5 is provided with fan groove, guide rail 3 both sides are provided with adjustment hole 4, cantilever lever 5 passes from adjustment hole 4, cantilever lever 5 can move up and down along adjustment hole 4, base 29 is provided with prestress charger, prestress charger comprises iron plate 7 and screw 6, screw 6 passes through threaded engagement with the hole at iron plate 7 center, the end fan groove of cantilever lever 5 is pushed down bottom screw 6, apply prestress on impact target cantilever lever 5 by the upper and lower displacement of set screw 6, guide rail 3 is fixed on base 29, fixed pulley is fixed on pedestal 28,
Described loading disk comprises wheel disc 13, the axis of rolling, first rolling bearing 15, second rolling bearing 16, dish core 14, wheel disc and the axis of rolling are structure as a whole, and the axis of rolling is coaxial with wheel disc, wheel disc 13, the axis of rolling, dish core 14 rotates around rolling bearing, be fixed on pedestal 28 outside rolling bearing, first wire rope 11 is walked around the first fixed pulley 8 and is connected with loading disk dish core 14 by the cantilever lever of impact target 2 side, second wire rope 12 one end connects the cantilever lever of impact target 2 opposite side, the other end walks around the second fixed pulley 9 and the 3rd fixed pulley 10 is wound around and is connected on the wheel disc 13 of loading disk, near the first wire rope 11 side is the first rolling bearing 15, first rolling bearing 15 is two-way bearings, the first prevents dish core axially to move forward by the tensile force hour wheel hair updo life of the first wire rope, it two is stop wheel disc to move radially when being subject to the twisting resistance of the second wire rope, second rolling bearing 16, near reinforcing bar 21 side, controls the radial motion of wheel disc, dish core moves vertically or rotates around axle center in the axis of rolling,
Described measurement mechanism comprises force snesor, metal strain plate sensor, between 3rd fixed pulley 10 and the wheel disc 13 loading disk, the first force snesor 17 is set, the second force snesor 18 is provided with between first wire rope 11 and dish core 14, at the inner metal clad strain-ga(u)ge transducer 19 of the reinforcing bar 21 of test specimen, for measuring the stress distribution along anchorage length of steel bar;
The front console 22 that described test piece fixing device comprises removable base plate 23 and side plate 24 and is fixed on pedestal, front console 22 center is provided with circular hole, test specimen is the reinforced concrete test specimen 20 of cylindrical structure, test specimen center is reinforcing bar 21, the axis of test specimen reinforcing bar 21 and the center line in front console 22 hole and coil the dead in line of core 14, base plate 23 and pedestal 28 contact position are provided with studdle 25, studdle 25 is welded on base plate 23, side plate 24 is angle steel, is provided with side plate set bolt 26 is connected with base plate 23 in side plate 24 angle steel corner.
In above-mentioned experimental provision, described impact target 2 with guide rail 3 for piston type contacts, guide rail 3 is the rectangular structure of boring, wire rope is fixed on the cantilever lever 5 of impact target 2 both sides, it is 0-5cm that impact target 2 runs altitude range, and impact target 2 on guides 3 traffic direction 1 falls direction and parallels with dropping hammer.
Described loading disk cylinder plate core 14 is connected with the first wire rope 11, and dish core 14, along axis of rolling axially-movable, transmits impact tension; Described dish core 14 is provided with two ribs, and axis of rolling inwall is provided with two chutes, and the rib on dish core 14 coordinates with the chute on the axis of rolling, band Moving plate core rotates, and wheel disc 13 is connected with the second wire rope 12, and rotating band Moving plate core rotates, form impulsive torque, transmit and impact twisting resistance; Described tensile impact power and impact twisting resistance by fixed pulley and wire rope transfers on the reinforcing bar of test specimen.Described first force snesor 17 measures and impacts twisting resistance, and the second force snesor 18 measures tensile impact power.
Distance between the height of described base plate 23 and biside plate 24 is regulated by bolt, concrete operation method is: according to the size of test specimen, by the upper and lower displacement of backplanes support screw rod 25 regulating base board, side plate 24 is angle steel, bolt adjustment hole 27 is provided with in base plate 23 and biside plate 24 contact position, side plate set bolt 26 can moving left and right at bolt adjustment hole 27, by the distance between the position-adjustable biside plate 24 of mobile side plate set bolt 26, the center line making the axis of test specimen reinforcing bar 21 and front console 22 hole and the axis coiling core 14 are on same straight line, the sidewall contact of side plate and test specimen, test specimen can not move.
The material of described impact mass block, guide rail, impact target, test specimen fixed case, fixed pulley, wheel disc and dish core is plow-steel, and described wire rope is twisted into by the finer wire with high strength.
The iron plate of described prestress charger is fixed on base, and iron plate 7 is n shape structures that top is arc plate, below is two rectangular parallelepiped plates; The arc plate center inside of iron plate 7 is provided with hole, is provided with screw thread in hole, and screw 6 inserts in iron plate hole above iron plate 7, coordinates with the screw thread in hole; Iron plate 7 is above cantilever lever 5; Described prestress charger acts on the both sides of impact target cantilever lever respectively, and screw 6 contacts with the plane place of cantilever lever 5 end fan groove, arranges prestressed size by set screw 6.
The following describes the experimental technique of said apparatus:
The experimental technique of above-mentioned impact tension-torsion loading experimental apparatus, comprises the following steps:
(1) test specimen is arranged in test specimen pickup groove, the height of regulating base board makes the axis of reinforcing bar and the axis being parallel of dish core, the side plate of described test piece fixing device is close to test specimen side and is fixed on base plate, reinforcing bar welds together with dish core, dish core is connected with wire rope, wire rope and dish core between be provided with the second force snesor, between wheel disc and the 3rd fixed pulley, the first force snesor is set, research be that dynamic tension-torsion load acts on the bond stress distribution of lower anchor bar in concrete simultaneously; Concrete steps are:
A, reinforced concrete test specimen 20 is put into test specimen pickup groove, the height of adjustment backplanes support screw rod 25, make reinforcing bar 21 through the center in test specimen pickup groove front console 22 hole, and the axis being parallel of the axis of reinforcing bar and dish core, again side plate 24 is abutted against on test specimen two sides, by fastening for side plate set bolt 26;
B, by reinforcing bar 21 with dish core 14 be connected;
The height of the screw 6 of c, adjustment prestress charger, Shi Hanzhang, makes the first wire rope 11 and the second wire rope 12 tighten.
(2) impact mass block impacts on impact target with certain altitude freely falling body, wire rope becomes the dynamic pressure load conversion on impact target dynamic tensile load and dynamically reverses moment load to be applied on reinforcing bar, the reinforcing bar in reinforced concrete is made to be reversed drawing fast, power, the moment of flexure of test specimen on reinforcing bar of drawing reinforcing bar is measured respectively by force snesor and metal strain plate sensor, with reinforcing bar strain, thus the bond stress distribution of anchor bar in concrete under obtaining dynamic tension-torsion load action; Concrete steps are:
D, mention and drop hammer 1 to specified altitude assignment;
Whether e, inspection force snesor connect normally, and record prestress value;
F, release are dropped hammer and 1 are completed Impulsive load;
The data of g, derivation force snesor and metal strain plate sensor.
(3) quality of regulation block release altitude, repeats above-mentioned steps, can study the impact of LOADING RATES on reinforced concrete dynamic adhesion stress distribution.Repeat above-mentioned steps a ~ g and complete experiment.
Claims (7)
1. impact tension-torsion load an experimental provision, it is characterized in that: it comprise drop hammer, test specimen, impact load transfer device, load disk, measurement mechanism, test piece fixing device;
Describedly to drop hammer as impact mass block, vertically do the movement of falling object;
Described test specimen is the reinforced concrete test specimen of rectangular structure, and test specimen center is provided with reinforcing bar;
Described impact load transfer device comprises impact target, guide rail, wire rope, fixed pulley, drop hammer and apply dynamic load on impact target, impact target runs on upright guide rail, impact target both sides are respectively equipped with columniform cantilever lever, the end of cantilever lever is provided with fan groove, guide rail both sides are provided with adjustment hole, cantilever lever passes from adjustment hole, cantilever lever can move up and down along adjustment hole, base is provided with prestress charger, prestress charger comprises iron plate and screw, threaded engagement is passed through in the hole at screw and iron plate center, the end of cantilever lever is contacted bottom screw, apply prestress on impact target cantilever lever by set screw, guide rail is fixed on base, fixed pulley is fixed on pedestal,
Described loading disk comprises wheel disc, the axis of rolling, the first rolling bearing, the second rolling bearing, dish core, wheel disc and the axis of rolling are structure as a whole, the axis of rolling is coaxial with wheel disc, wheel disc, the axis of rolling, dish core rotate around rolling bearing, be fixed on outside rolling bearing on pedestal, first wire rope is walked around the first fixed pulley and is connected with loading disk dish core by the cantilever lever of impact target side, second wire rope one end connects the cantilever lever of impact target opposite side, and the other end walks around the second fixed pulley and the 3rd fixed pulley is wound around and is connected on the wheel disc of loading disk; Near the first wire rope side is the first rolling bearing, and the first rolling bearing is two-way bearing, and moving radially of restriction wheel disc moves forward with axial, and the second rolling bearing, near reinforcing bar side, controls the radial motion of wheel disc; Dish core moves vertically or rotates around axle center in the axis of rolling;
Described measurement mechanism comprises force snesor, metal strain plate sensor, between 3rd fixed pulley and the wheel disc loading disk, the first force snesor is set, the second force snesor is provided with, at the inner metal clad strain-ga(u)ge transducer of the reinforcing bar of test specimen for measuring the stress distribution along anchorage length of steel bar between wire rope and dish core;
The front console that described test piece fixing device comprises removable base plate and side plate and is fixed on pedestal, front console center is provided with circular hole, the axis of test specimen reinforcing bar and the center line of front end face plate hole and coil the dead in line of core, base plate and base into contact place are provided with studdle, studdle is welded on base plate, and side plate is bolted on base plate.
2. the experimental provision of impact tension-torsion loading according to claim 1, it is characterized in that: described impact target and guide rail are that piston type contacts, guide rail is the rectangular structure of boring, wire rope is fixed on the cantilever lever of impact target both sides, it is 0-5cm that impact target runs altitude range, and impact target traffic direction on guide rail falls direction and parallels with dropping hammer.
3. the experimental provision of impact tension-torsion loading according to claim 1, is characterized in that: described dish core is connected with the first wire rope, and dish core, along axis of rolling axially-movable, transmits tensile impact power; Described dish core is provided with two ribs, and axis of rolling inwall is provided with two chutes, and the rib on dish core coordinates with the chute on the axis of rolling, and band Moving plate core rotates, and the wheel disc of described loading disk is connected with the second wire rope, transmits and impacts twisting resistance; Described tensile impact power and impact twisting resistance by fixed pulley and wire rope transfers on the reinforcing bar of test specimen.
4. the experimental provision of impact tension-torsion loading according to claim 1, it is characterized in that: the distance between the height of described base plate and biside plate is regulated by bolt, according to the size of test specimen, by the height of studdle regulating base board, the axis regulating the distance between two side plates to make the axis of test specimen reinforcing bar and the center line of front end face plate hole again and to coil core is on same straight line, the sidewall contact of side plate and test specimen, test specimen can not move.
5. the experimental provision of impact tension-torsion loading according to claim 1, it is characterized in that: the material of described impact mass block, guide rail, impact target, test specimen fixed case, fixed pulley, wheel disc and dish core is plow-steel, the material of described wire rope is that the finer wire with high strength twists into.
6. the experimental provision of impact tension-torsion loading according to claim 1, is characterized in that: the iron plate of described prestress charger is fixed on base, and iron plate is the n shape structure that top is arc plate, below is two rectangular parallelepiped plates; The arc plate center inside of iron plate is provided with hole, is provided with screw thread in hole, and screw inserts in iron plate hole above iron plate, coordinates with the screw thread in hole; Iron plate is above cantilever lever; Described prestress charger acts on the both sides of impact target respectively, arranges prestressed size by regulating the screw of upper end.
7. an experimental technique for the experimental provision that the impact tension-torsion described in any one of claim 1 ~ 6 loads, is characterized in that: comprise the following steps:
(1) test specimen is arranged in test specimen pickup groove, the height of regulating base board makes the axis of reinforcing bar and the axis being parallel of dish core, the side plate of described test piece fixing device is close to test specimen side and is fixed on base plate, reinforcing bar welds together with dish core, dish core is connected with wire rope, wire rope and dish core between be provided with the second force snesor, between wheel disc and the 3rd fixed pulley, the first force snesor is set, research be that dynamic tension-torsion load acts on the bond stress distribution of lower anchor bar in concrete simultaneously;
(2) impact mass block impacts on impact target with certain altitude freely falling body, wire rope becomes the dynamic pressure load conversion on impact target dynamic tensile load and dynamically reverses moment load to be applied on reinforcing bar, the reinforcing bar in reinforced concrete is made to be reversed drawing fast, moment of flexure on reinforcing bar of the power of drawing reinforcing bar, test specimen and reinforcing bar strain is measured respectively by force snesor and metal strain plate sensor, thus the bond stress distribution of anchor bar in concrete under obtaining dynamic tension-torsion load action;
(3) quality of regulation block release altitude, repeats above-mentioned steps, can study the impact of LOADING RATES on reinforced concrete dynamic adhesion stress distribution.
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| CN104181102A (en) | 2014-12-03 |
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