CN212568305U - Double-top L-beam loading compression shear test system - Google Patents
Double-top L-beam loading compression shear test system Download PDFInfo
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- CN212568305U CN212568305U CN202021194215.9U CN202021194215U CN212568305U CN 212568305 U CN212568305 U CN 212568305U CN 202021194215 U CN202021194215 U CN 202021194215U CN 212568305 U CN212568305 U CN 212568305U
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Abstract
The utility model belongs to shear force wall test piece shock resistance's test device discloses a two L roof beam loading compression shear test system. The system comprises an experiment pedestal, a fixing device, a supporting device, an L-shaped loading beam, a loading device and a guiding device; the guiding device comprises a cross beam, a rotation constraint four-bar linkage and a vertical guiding mechanism, wherein the vertical guiding mechanism comprises a guiding bottom frame, a horizontal guide rail, a vertical guide rail, a guiding beam and a sliding block, the guiding bottom frame is installed on the experiment pedestal, the horizontal guide rail is installed on the guiding bottom frame, the guiding beam is connected with the horizontal guide rail, the vertical guide rail is installed on the guiding beam, and the sliding block is installed inside the lower end of the L-shaped loading beam and connected with the vertical guide rail in a sliding mode. The system can ensure that the L-shaped loading beam can be kept horizontal and well simulate seismic load.
Description
Technical Field
The utility model relates to a shear force wall test piece shock resistance's test device, in particular to double-top L roof beam loading compression shear test system.
Background
When a traditional loading frame is used for a shear wall test piece anti-seismic and anti-shearing test and a beam column node hysteretic test, a horizontal loading actuator is generally directly connected to the upper part of a test piece for loading, and the loading mode has the defects that the maximum bending moment appears at the bottom of the test piece, and the bottom of the test piece is easy to bend and damage, so that an ideal shearing test effect cannot be obtained. Chinese patent CN104198300A discloses a civil engineering array loading test system, the system includes reaction frame, a vertical unit of actuating, unit and a loading roof beam are actuated to an at least level, vertical unit of actuating arranges in the loading roof beam top, it includes two at least vertical actuators of perpendicular parallel arrangement, reaction frame, vertical actuator and loading roof beam constitute plane link mechanism or space coupling mechanism, the level actuates the unit and arranges in the loading roof beam side, every group level actuates the horizontal actuator that the unit includes at least one level and arranges, vertical actuator and horizontal actuator's both ends respectively with reaction frame, the loading roof beam is articulated to be connected. It carries out experimental loading through the loading roof beam, and the actuator provides the loading power of loading roof beam, carries out different experimental loading through link mechanism's different deformations, and this test system not only can be fine satisfies the experimental requirement of civil engineering compression shear, does not need special follow-up device moreover, and no frictional force influence, simultaneously, this system need not reform transform, directly just can accomplish the experimental loading of more various types of structure.
Therefore, although the stress state of the test piece can be optimized and the bending moment at the bottom of the test piece is reduced, the vertical actuator is longer, the test piece occupies a larger experimental space, the offset included angle of the vertical actuator needs to be considered after the horizontal displacement of the test piece occurs, the control mode is more complex, most importantly, the guide device is lacked, and a series of problems of inclination, instability and the like easily occur to the loading beam in the experimental process. In view of this, a novel compression shear test device is developed, the L-shaped loading beam can be kept horizontal, seismic load can be well simulated, and the device has important significance.
SUMMERY OF THE UTILITY MODEL
In order to solve the technical problem such as test device occupation of land space among the prior art is big, the easy slope, the unstability of taking place of load beam, the utility model provides a double-top L roof beam loading compression shear test system.
In order to solve the technical problem, the utility model discloses a following technical scheme:
a double-top L-beam loading compression-shear test system comprises an experiment pedestal, a fixing device, a supporting device, an L-shaped loading beam, a loading device and a guiding device, wherein the fixing device fixes a shear wall test piece on the experiment pedestal, the L-shaped loading beam comprises an L-shaped loading beam cross beam and an L-shaped loading beam vertical beam, the L-shaped loading beam cross beam is fixedly connected with the upper end of the shear wall test piece, and the loading device is connected with the L-shaped loading beam and applies horizontal load and vertical load to the shear wall test piece; the supporting device comprises two mutually parallel stand columns installed on the experiment pedestal and a main cross beam connected with the stand columns, the guiding device comprises a cross beam, a four-bar linkage and a vertical guiding mechanism are rotationally constrained, the vertical guiding mechanism comprises a guiding chassis, a horizontal guide rail, a vertical guide rail, a guiding beam and a sliding block, the guiding chassis is installed on the experiment pedestal, the horizontal guide rail is installed on the guiding chassis, the guiding beam is connected with the horizontal guide rail, the vertical guide rail is installed on the guiding beam, the sliding block is installed inside the lower end of the L-shaped loading beam vertical beam and is connected with the vertical guide rail in a sliding mode.
The guiding device comprises a four-bar guiding mechanism arranged between the main frame and the L-shaped loading beam cross beam, and a vertical guiding mechanism which limits the rotation of the L-shaped loading beam vertical beam is arranged in the lower end of the L-shaped loading beam vertical beam. In order to guarantee the test precision, the guide mechanism can limit the loading beam to rotate, the L-shaped loading beam cross beam is guaranteed to be always kept in a horizontal state in the experimental process, the effect of preventing the loading beam from generating out-of-plane instability can be achieved, and meanwhile, the bending moment at the bottom of the test piece is reduced to be half of the top loading mode.
As preferred, the stand bottom through the pedestal pull rod with experiment pedestal fixed connection, the stand top with the stand main beam passes through vice crossbeam and connects, the crossbeam rotate restraint four connecting rod both ends respectively with L type load beam crossbeam with the main beam is connected.
The loading device comprises a vertical loading system and a transverse loading system; the vertical loading system comprises a follow-up small platform fixed on the L-shaped loading beam cross beam, two hydraulic loading oil cylinders installed on the follow-up small platform and a closed-loop control system for controlling vertical double-top synchronous loading of the vertical loading system. The loading oil cylinders only occupy a small experimental space, a test piece with a large height can be tested on the premise that the space of the loading frame is limited, the vertical loading system adopts a vertical double-top synchronous loading control system to perform closed-loop control, the two vertical loading oil cylinders are guaranteed to have the same displacement and the same resultant force in the experimental process, the L-shaped loading beam cross beam is guaranteed to be kept horizontal, and the earthquake load is well simulated.
Horizontal loading system include with the L type load beam erects the horizontal actuator that the roof beam is connected, with what horizontal actuator was connected installs horizontal reaction frame on the experiment pedestal. The horizontal actuator is installed on the vertical beam of the L-shaped loading beam, the height of a horizontal loading system can be adjusted at will, preferably, the horizontal actuator can also be installed at the height position of the vertical beam 1/2 of the L-shaped loading beam, the height of a loading point is changed, a reverse bending point moves to a position half the height of a test piece, and the transverse loading system is installed at the position 1/2 of the height of the test piece, so that the L-shaped loading beam can be more stable.
The fixing device fixes the shear wall test piece on the experiment pedestal, and preferably comprises a lower pressing beam and a lower anchor rod which are arranged at the lower part of the shear wall test piece, and an upper pressing beam and an upper anchor rod which are arranged at the upper part of the shear wall test piece. The pressing beam and the anchor rod are used for pressing the test piece and transmitting bending moment.
Compared with the prior art, the double-top L-beam loading compression shear test system provided by the utility model has the advantages that the test device adopts multiple means, ensures that the L-shaped loading beam is in a horizontal state, can limit the loading beam to rotate, so that the middle position of the shear wall test piece is close to a pure shear section, ensures that the L-shaped loading beam cross beam is always kept in a horizontal state in the experimental process, and can prevent the loading beam from generating external instability; the loading system only occupies a small experimental space, a test piece with a large height can be tested on the premise that the space of the loading frame is limited, the two vertical loading oil cylinders are guaranteed to have the same displacement and the same resultant force in the experimental process, the L-shaped loading beam cross beam is guaranteed to be kept horizontal, and the earthquake load is well simulated.
Drawings
Fig. 1 is a schematic structural view of a double-top L-beam loading compression-shear test system provided by the present invention;
fig. 2 is a schematic structural view of the vertical guide mechanism provided by the present invention.
Detailed Description
The utility model aims at providing a test system is pressed in loading of two top L roof beams to test device takes up an area of the big, loading roof beam of space and takes place a series of slopes, unstability scheduling technical problem easily among the solution prior art.
In order to enable those skilled in the art to better understand the present invention, the following detailed description of the invention is provided in conjunction with the accompanying drawings.
Fig. 1-2 show a preferred embodiment of the present invention, and as shown in the drawings, a double-top L-beam loading compression-shear test system comprises a test bed 14, a fixing device, a supporting device, an L-shaped loading beam, a loading device and a guiding device, the supporting device comprises two parallel upright posts 1 arranged on a laboratory bench 14 and a main beam 2 connected with the upright posts 13, the bottom of the upright 1 is fixedly connected with the experiment pedestal 14 through a pedestal pull rod 4, the top of the upright 1 is connected with the main beam 3 through an auxiliary beam 2, the L-shaped loading beam comprises an L-shaped loading beam cross beam 6 and an L-shaped loading beam vertical beam 7, the L-shaped loading beam cross beam 6 is fixedly connected with the upper end of the shear wall test piece H, the loading device is connected with the L-shaped loading beam and applies horizontal load and vertical load to the shear wall test piece; the guiding device comprises a beam rotation constraint four-bar linkage 11 and a vertical guiding mechanism, two ends of the beam rotation constraint four-bar linkage 11 are respectively connected with the L-shaped loading beam 6 and the main beam 7, the vertical guide mechanism comprises a guide underframe 20, a horizontal guide rail 19, a vertical guide rail 18, a guide beam 17 and a slide block 21, the guide chassis 20 is fixedly installed on the experiment table 14, the horizontal guide rail 19 is installed on the guide chassis 20, the guide beam 17 is connected with the horizontal guide rail 19, the vertical guide rail 19 is installed on the guide beam 17, the slide block 21 is installed inside the lower end of the L-shaped loading beam vertical beam 7, and is connected with the vertical guide rail 19 in a sliding way, the guide beam 17 can realize horizontal and vertical reciprocating motion under the driving of the L-shaped loading beam vertical beam 7, and can play a role in restraining the L-shaped loading beam vertical beam 7 from rotating in the plane and losing stability out of the plane.
The loading device comprises a vertical loading system and a transverse loading system; the vertical loading system comprises a follow-up small platform 8 fixed on the L-shaped loading beam cross beam 6, two hydraulic loading oil cylinders 9 installed on the follow-up small platform 8 and a closed-loop control system (not shown) for controlling vertical double-top synchronous loading of the vertical loading system. Horizontal loading system include with the L type load beam erects horizontal actuator 10 that roof beam 7 connects, with what horizontal actuator 10 was connected installs horizontal reaction frame 5 on the experiment pedestal, horizontal actuator 10 installs the 1/2 high position department of roof beam 7 is erected to the L type load beam.
The fixing device fixes the shear wall test piece H on the experiment table base 14, and in a preferred embodiment, the fixing device comprises a lower compression beam and a lower anchor rod 13 which are arranged at the lower part of the shear wall test piece, and an upper compression beam and an upper anchor rod 15 which are arranged at the upper part of the shear wall test piece.
The utility model provides a concrete test method of test device as follows:
after the shear wall test piece H is installed in place, vertical load is applied through the two hydraulic loading oil cylinders of the vertical loading system, the two oil cylinders are controlled to move and the like all the time in the loading process, and when the sum of the loads of the two oil cylinders reaches the required load, load keeping is carried out.
The transverse loading system adopts a low-cycle repeated loading mode, firstly, load grading cyclic loading is carried out, when obvious cracks are found in a test piece, the load corresponding to the first crack of the test piece is taken as a cracking load, load sensors (not shown) are arranged at the front ends of the horizontal actuators for measuring vertical loads, then, displacement grading loading is carried out, loading is stopped until the test piece reaches the limit displacement, and the breaking load is 85% of the peak load; the displacement values of two hydraulic loading oil cylinders of two vertical loading systems are always kept to be equal in the horizontal loading process, the sum of oil cylinder loads is customized, the difference value of the two oil cylinder loads is used for balancing additional bending moment generated in the loading process, a magnetostrictive displacement sensor can be arranged in the oil cylinder and used for measuring vertical displacement, and corresponding hysteresis curves and other relevant curves capable of reflecting the shock resistance of the shear wall test piece can be manufactured according to the collected data.
It is right above the utility model provides a two top L roof beam loading compression shear test system has carried out detailed introduction. The principles and embodiments of the present invention have been explained herein using specific examples, which are presented only to assist in understanding the methods and concepts of the present invention. It should be noted that, for those skilled in the art, without departing from the principle of the present invention, the present invention can be subject to several improvements and modifications, which also fall within the scope of the claims of the present invention.
Claims (4)
1. The utility model provides a two top L roof beam loading compression shear test system which characterized in that: the device comprises an experiment pedestal, a fixing device, a supporting device, an L-shaped loading beam, a loading device and a guiding device, wherein the fixing device fixes a shear wall test piece on the experiment pedestal, the supporting device comprises two parallel stand columns arranged on the experiment pedestal and a main cross beam connected with the stand columns, the L-shaped loading beam comprises an L-shaped loading beam cross beam and an L-shaped loading beam vertical beam, the L-shaped loading beam cross beam is fixedly connected with the upper end of the shear wall test piece, and the loading device is connected with the L-shaped loading beam and applies horizontal load and vertical load to the shear wall test piece; the guiding device comprises a cross beam, a rotation constraint four-bar linkage and a vertical guiding mechanism, wherein the vertical guiding mechanism comprises a guiding bottom frame, a horizontal guide rail, a vertical guide rail, a guiding beam and a sliding block, the guiding bottom frame is installed on the experiment pedestal, the horizontal guide rail is installed on the guiding bottom frame, the guiding beam is connected with the horizontal guide rail, the vertical guide rail is installed on the guiding beam, and the sliding block is installed inside the lower end of the L-shaped loading beam and connected with the vertical guide rail in a sliding mode.
2. The double-top L-beam load compression-shear test system of claim 1, wherein: the loading device comprises a vertical loading system and a transverse loading system; the vertical loading system comprises a follow-up small platform fixed on the L-shaped loading beam cross beam, two hydraulic loading oil cylinders installed on the follow-up small platform and a closed-loop control system for controlling vertical double-top synchronous loading of the vertical loading system.
3. The double-top L-beam load compression-shear test system of claim 2, wherein: horizontal loading system include with the L type load beam erects the horizontal actuator that the roof beam is connected, with what horizontal actuator was connected installs horizontal reaction frame on the experiment pedestal.
4. The double-top L-beam load compression-shear test system of claim 3, wherein: and the horizontal actuator is arranged on the L-shaped loading beam vertical beam.
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| CN202021194215.9U CN212568305U (en) | 2020-06-24 | 2020-06-24 | Double-top L-beam loading compression shear test system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113567273A (en) * | 2021-07-21 | 2021-10-29 | 同济大学 | Double-side loading type large-scale compression-shear-bending composite multifunctional loading test device and method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113567273A (en) * | 2021-07-21 | 2021-10-29 | 同济大学 | Double-side loading type large-scale compression-shear-bending composite multifunctional loading test device and method |
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