CN111678812A - 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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- CN111678812A CN111678812A CN202010587379.6A CN202010587379A CN111678812A CN 111678812 A CN111678812 A CN 111678812A CN 202010587379 A CN202010587379 A CN 202010587379A CN 111678812 A CN111678812 A CN 111678812A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/24—Investigating strength properties of solid materials by application of mechanical stress by applying steady shearing forces
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M7/00—Vibration-testing of structures; Shock-testing of structures
- G01M7/02—Vibration-testing by means of a shake table
- G01M7/06—Multidirectional test stands
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/02—Details
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/32—Investigating strength properties of solid materials by application of mechanical stress by applying repeated or pulsating forces
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0001—Type of application of the stress
- G01N2203/0003—Steady
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0001—Type of application of the stress
- G01N2203/0005—Repeated or cyclic
- G01N2203/0007—Low frequencies up to 100 Hz
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0014—Type of force applied
- G01N2203/0025—Shearing
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/003—Generation of the force
- G01N2203/0042—Pneumatic or hydraulic means
- G01N2203/0048—Hydraulic means
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0058—Kind of property studied
- G01N2203/006—Crack, flaws, fracture or rupture
- G01N2203/0062—Crack or flaws
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/026—Specifications of the specimen
- G01N2203/0262—Shape of the specimen
- G01N2203/0264—Beam
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/06—Indicating or recording means; Sensing means
- G01N2203/0617—Electrical or magnetic indicating, recording or sensing means
- G01N2203/0635—Electrical or magnetic indicating, recording or sensing means using magnetic properties
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/06—Indicating or recording means; Sensing means
- G01N2203/067—Parameter measured for estimating the property
- G01N2203/0682—Spatial dimension, e.g. length, area, angle
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- General Health & Medical Sciences (AREA)
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- Pathology (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The invention belongs to a test device for the shock resistance of a shear wall test piece, and discloses a double-top L-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 invention relates to a shear wall test piece shock resistance test device, in particular to a double-top L-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.
Disclosure of Invention
The invention provides a double-top L-beam loading compression-shear test system, which aims to solve the technical problems that a test device in the prior art occupies a large space, a loading beam is easy to incline and destabilize in a series and the like.
In order to solve the technical problems, the invention adopts the 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.
Preferably, the bottom of the upright column is fixedly connected with the experiment pedestal through a pedestal pull rod, the top of the upright column is connected with the main cross beam of the upright column through an auxiliary cross beam, and two ends of the cross beam rotation constraint four-bar linkage are respectively connected with the L-shaped loading beam cross beam and the main cross beam.
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 invention 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, enables the middle position of a shear wall test piece to be close to a pure shear section, ensures that the cross beam of the L-shaped loading beam is always kept in a horizontal state in the test process, and can prevent the loading beam from being unstable out of the plane; 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 diagram of a double-top L-beam loading compression-shear test system provided by the present invention;
fig. 2 is a schematic structural diagram of a vertical guide mechanism provided by the present invention.
Detailed Description
The invention aims to provide a double-top L-beam loading compression-shear test system to solve the technical problems that a test device in the prior art is large in occupied space, a loading beam is prone to a series of inclination and instability and the like.
In order that those skilled in the art will be better able to understand the present invention, the following detailed description of the invention is given in conjunction with the accompanying drawings.
Fig. 1-2 illustrate a preferred embodiment of the present invention, and as shown in the figures, a double-top L-beam loading compression-shear test system includes an experiment pedestal 14, a fixing device, a supporting device, an L-shaped loading beam, a loading device, and a guiding device, where the supporting device includes two parallel columns 1 mounted on the experiment pedestal 14 and a main beam 2 connected to the columns 13, the bottom of the column 1 is fixedly connected to the experiment pedestal 14 through a pedestal draw bar 4, the top of the column 1 is connected to the main beam 3 through a sub beam 2, the L-shaped loading beam includes 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 to the upper end of the shear wall test piece H, and the loading device is connected to the L-shaped loading beam and applies horizontal and vertical loads 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 specific test method of the test device provided by the invention is 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.
The double-top L-beam loading compression-shear test system provided by the invention is described in detail above. The principles and embodiments of the present invention are explained herein using specific examples, which are presented only to assist in understanding the method and central concepts of the present invention. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications 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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| Application Number | Priority Date | Filing Date | Title |
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| CN202010587379.6A CN111678812A (en) | 2020-06-24 | 2020-06-24 | Double-top L-beam loading compression shear test system |
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| CN202010587379.6A CN111678812A (en) | 2020-06-24 | 2020-06-24 | Double-top L-beam loading compression shear test system |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112179789A (en) * | 2020-11-13 | 2021-01-05 | 福州大学 | Assembled connecting piece shearing experiment device and using method |
| CN112964463A (en) * | 2021-04-13 | 2021-06-15 | 哈尔滨工业大学 | Parallel four-bar test loading device matched with reaction frame |
| CN113008709A (en) * | 2021-03-19 | 2021-06-22 | 定南县沃土园林养护有限公司 | Adjustable measuring device for shear wall strength detection and implementation method thereof |
| CN113567274A (en) * | 2021-07-21 | 2021-10-29 | 同济大学 | Single-side loading type large-scale compression-shear-bending composite loading test device and application thereof |
| CN114441323A (en) * | 2021-12-24 | 2022-05-06 | 中国商用飞机有限责任公司北京民用飞机技术研究中心 | Double-acting-cylinder coordinated loading test bed and coordinated loading test method |
| NL2032696B1 (en) * | 2022-08-06 | 2023-05-16 | Univ Jilin Jianzhu | Stress detection and analysis test bench |
-
2020
- 2020-06-24 CN CN202010587379.6A patent/CN111678812A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112179789A (en) * | 2020-11-13 | 2021-01-05 | 福州大学 | Assembled connecting piece shearing experiment device and using method |
| CN113008709A (en) * | 2021-03-19 | 2021-06-22 | 定南县沃土园林养护有限公司 | Adjustable measuring device for shear wall strength detection and implementation method thereof |
| CN112964463A (en) * | 2021-04-13 | 2021-06-15 | 哈尔滨工业大学 | Parallel four-bar test loading device matched with reaction frame |
| CN113567274A (en) * | 2021-07-21 | 2021-10-29 | 同济大学 | Single-side loading type large-scale compression-shear-bending composite loading test device and application thereof |
| CN114441323A (en) * | 2021-12-24 | 2022-05-06 | 中国商用飞机有限责任公司北京民用飞机技术研究中心 | Double-acting-cylinder coordinated loading test bed and coordinated loading test method |
| NL2032696B1 (en) * | 2022-08-06 | 2023-05-16 | Univ Jilin Jianzhu | Stress detection and analysis test bench |
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