A test device and test method for masonry rigid core shear loading

Abstract

The application discloses a kind of test device and test method for masonry rigid core shear loading, belong to masonry measurement technical field, including loading support, the loading support is equipped with jack holder, hydraulic jack is installed in the bottom of the jack holder, the piston rod bottom of the hydraulic jack is connected with movable force transmission cushion block, and the movable force transmission cushion block is connected with first load transmission steel base.The application uses the above-mentioned test device and test method for masonry rigid core shear loading, changes the position of hydraulic jack, can realize the position change of external load action, makes the resultant force of external load act on the stiffness center of masonry sample, so that the masonry sample occurs pure shear failure, and the load transmission lower steel base is fixed on the base through support bolt, which is convenient to disassemble and replace, so that the load transmission lower steel base can adapt to different masonry samples.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of masonry measurement, in particular to a test device and test method for masonry rigid center shear loading. BACKGROUND

[0002] The existing shear test method of brick masonry is diagonal shear loading of brick masonry wall, which adopts full-interface direct loading method, and the load is concentrated on the center of the test piece. The test piece is not pure shear failure, and is affected by the in-plane bending moment. The experimental results have errors. The existing masonry test piece usually adopts single-face reinforcement method. The masonry test piece is not pure shear failure. Due to the non-uniformity of the stiffness between the reinforcing material and the masonry of the reinforced masonry, the single-face reinforced test piece is usually affected by the in-plane bending moment during the diagonal shear test, and the experimental results have errors. SUMMARY

[0003] The purpose of the present application is to provide a test device and test method for masonry rigid center shear loading. The position of the hydraulic jack is changed, the position of the external load is changed, the resultant force of the external load acts on the stiffness center of the masonry test piece, so that the masonry test piece is pure shear failure. The lower steel seat is fixed on the base through the support bolt, which is convenient for disassembly and replacement, so that the lower steel seat can adapt to different masonry test pieces.

[0004] In order to achieve the above purpose, the present application provides a test device and test method for masonry rigid center shear loading, which comprises a loading support, a jack seat is arranged on the loading support, a hydraulic jack is installed at the bottom of the jack seat, the piston rod of the hydraulic jack is connected with a movable force transmission pad at the bottom, and the movable force transmission pad is connected with a first load transmission steel seat.

[0005] Preferably, the first load transmission steel seat is a combined steel plate with a groove, the first load transmission steel seat and the movable force transmission pad are engaged, the number of the first load transmission steel seat and the number of the movable force transmission pad are both two, and the shapes of the two first load transmission steel seats are both V-shaped.

[0006] Preferably, a base is arranged below the jack seat, a second load transmission steel seat is fixed on the top of the base through a support bolt, a movable force transmission pad is welded on the top of the second load transmission steel seat, and the movable force transmission pad is engaged with the first load transmission steel seat.

[0007] Preferably, the top of the jack seat is connected with a hydraulic loading device.

[0008] Preferably, a load sensor is arranged between the piston rod of the hydraulic jack and the movable force transmission pad.

[0009] A test method for masonry rigid center shear loading comprises the following steps:

[0010] S1, preparing a masonry sample;

[0011] S2, placing one corner of the masonry sample prepared in S1 on the first load transmission steel base below, and then placing another first load transmission steel base at the opposite corner of the masonry sample;

[0012] S3, starting the hydraulic loading device to adjust the position of the hydraulic jack through the jack holder, starting the hydraulic jack to make the movable force transmission pad engage with the first load transmission steel base;

[0013] S4, adjusting the hydraulic jack to change the size of the applied load of the masonry sample;

[0014] S5, analyzing the performance parameter change rule of the ultimate shear bearing capacity of the masonry sample when the resultant force of the applied load acts on the stiffness center of the masonry sample;

[0015] S6, on the basis of S1 to S5, changing the position of the hydraulic jack relative to the movable force transmission pad, and studying the influence of the eccentric distance on the shear bearing capacity of the masonry sample.

[0016] Therefore, the test device and test method for masonry stiffness center shear loading are adopted, the position of the hydraulic jack is changed, the position of the applied load is changed, the resultant force of the applied load acts on the stiffness center of the masonry sample, the masonry sample is subjected to pure shear failure, the lower load transmission steel base is fixed on the base through the support bolt, and the lower load transmission steel base can be conveniently disassembled and replaced, so that the lower load transmission steel base can adapt to different masonry samples.

[0017] The technical solutions of the present application will be further described in detail below with reference to the drawings and embodiments. BRIEF DESCRIPTION OF DRAWINGS

[0018] Fig. 1 is a perspective structural schematic view of a test device for masonry stiffness center shear loading according to the present application;

[0019] Fig. 2 is a perspective structural schematic view of a test device for masonry stiffness center shear loading according to the present application;

[0020] Fig. 3 is a perspective structural schematic view of a test device for masonry stiffness center shear loading according to the present application;

[0021] Fig. 4 is a perspective structural schematic view of a test device for masonry stiffness center shear loading according to the present application.

[0022] REFERENCE NUMERALS

[0023] 1, masonry sample; 2, loading support; 3, first load transmission steel base; 4, second load transmission steel base; 5, movable force transmission cushion block; 6, hydraulic jack; 7, jack holder; 8, support bolt; 9, base. DETAILED DESCRIPTION

[0024] The technical solutions of the present application are further described below by means of the accompanying drawings and examples.

[0025] Unless otherwise defined, technical terms or scientific terms used in the present application shall have the common meaning understood by one of ordinary skill in the art to which the present application belongs. The terms "first", "second", and similar terms used in the present application do not indicate any order, number, or importance, but are only used to distinguish different components. The terms "include" or "contain" and similar terms mean that the elements or objects before the terms encompass the elements or objects listed after the terms and their equivalents, and do not exclude other elements or objects. The terms "connected" or "connected" and similar terms are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. The terms "up", "down", "left", "right", and the like are only used to indicate relative positional relationships, and when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0026] Example 1

[0027] As shown in Figs. 1 to 4 The present application provides a test device for masonry rigid core shear loading, which comprises a loading support 2, a jack holder 7 is arranged on the loading support 2, and the loading support 2 provides support for the jack holder 7. The top of the jack holder 7 is connected with a hydraulic loading device, and the hydraulic loading device adopts the method of the prior art, can realize multi-directional loading through multiple hydraulic cylinders and direction controllers, and can flexibly adjust the loading direction and angle, so as to drive the jack holder 7 to move.

[0028] The bottom of the jack holder 7 is provided with a hydraulic jack 6, and the movement of the jack holder 7 will drive the hydraulic jack 6 to move, so that the resultant force of the external load of the masonry sample 1 acts on the stiffness center of the masonry sample 1. The piston rod of the hydraulic jack 6 is connected with the movable force transmission cushion block 5, and a load sensor is arranged between the piston rod of the hydraulic jack 6 and the movable force transmission cushion block 5. The position of the hydraulic jack 6 is moved by moving the jack holder 7, and is fixed by embedding it in the movable force transmission cushion block 5. By changing the position and size of the movable force transmission cushion block 5, the external load of the masonry sample 1 can be adjusted, and continuous test with different eccentric distances can be realized.

[0029] The movable force transmission cushion 5 is connected with the first load transmission steel seat 3. The first load transmission steel seat 3 is a combined steel plate with a groove, and the first load transmission steel seat 3 and the movable force transmission cushion 5 are engaged to form a force transmission whole. The width and spacing of the groove on the first load transmission steel seat 3 can be adjusted and designed according to the masonry sample 1. The movable force transmission cushion 5 is provided with a caliper at the top, which can ensure the accurate position and height of the movable force transmission cushion, so as to ensure that the force transmission is more uniform and accurate. The spacing between each group of calipers should be controlled within 10-50mm, and the height of each caliper should be uniformly controlled within 10-30mm.

[0030] The number of the first load transmission steel seat 3 and the movable force transmission cushion 5 is two, and the shape of the two first load transmission steel seats 3 is the same V-shaped. The height of the first load transmission steel seat 3 should be controlled within 100-300mm, and the width should be 10-50mm. The base 9 is arranged below the jack seat 7, and the base 9 is fixed on the ground. The height of the base 9 is 500-1500mm. The second load transmission steel seat 4 is fixed on the top of the base 9 through the support bolt 8, which can not only maintain stability, but also be convenient to disassemble when needed. The movable force transmission cushion 5 is welded on the top of the second load transmission steel seat 4, and the top of the movable force transmission cushion 5 is engaged with the first load transmission steel seat 3, which can support the lower part of the masonry sample 1 and facilitate the shear test.

[0031] Example two

[0032] A test method for masonry rigid core shear loading, using a test device for masonry rigid core shear loading of example one, comprising the following steps:

[0033] S1, preparing a masonry sample 1;

[0034] S2, placing one corner of the masonry sample 1 prepared in S1 on the lower first load transmission steel seat 3, and then placing another first load transmission steel seat 3 at the opposite corner of the masonry sample 1;

[0035] S3, starting the hydraulic loading device to adjust the position of the hydraulic jack 6 through the jack seat 7, and starting the hydraulic jack 6 to make the movable force transmission cushion 5 engage with the first load transmission steel seat 3;

[0036] S4, adjusting the hydraulic jack 6 to change the size of the applied load of the masonry sample 1;

[0037] S5, analyzing the performance parameter change rule of the ultimate shear bearing capacity of the masonry sample 1 when the resultant force of the applied load acts on the stiffness center of the masonry sample 1;

[0038] The conversion coefficient of the shear bearing capacity between the centroid force and the rigid core force is proposed, and the range of the coefficient is 0.80-0.95.

[0039] S6, on the basis of S1 to S5, change the position of the hydraulic jack 6 relative to the movable force block 5, and study the influence of the eccentric distance on the shear bearing capacity of the masonry sample 1.

[0040] Therefore, the application adopts the above-mentioned test device and test method for masonry rigid center shear loading, changes the position of the hydraulic jack, can realize the change of the position of the applied load, makes the resultant force of the applied load act on the stiffness center of the masonry sample, so that the masonry sample occurs pure shear failure, the steel seat under the load transmission is fixed on the base through the support bolt, which is convenient for disassembly and replacement, so that the steel seat under the load transmission can adapt to different masonry samples.

[0041] Finally, it should be noted that: the above examples are only used to illustrate the technical solutions of the present application, but not to limit it, although the present application has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that: it can still modify or equivalently replace the technical solutions of the present application, and these modifications or equivalent replacements also cannot make the modified technical solutions deviate from the spirit and scope of the technical solutions of the present application.

Claims

1. A test apparatus for use in the determination of the core shear strength of masonry, characterised in that: The loading support is provided with a jack seat, a hydraulic jack is installed at the bottom of the jack seat, the piston rod of the hydraulic jack is connected with a movable force transmission pad, and the movable force transmission pad is connected with a first load transmission steel base; The first load transmission steel base is a combined steel plate with a groove, the first load transmission steel base and the movable force transmission pad are in engagement, the number of the first load transmission steel bases and the number of the movable force transmission pads are both two, and the two first load transmission steel bases are in the same V-shaped form.

2. A test device for use in the determination of the rigid core shear of masonry according to claim 1, wherein: A base is arranged below the jack seat, a second load transmission steel base is fixed on the top of the base through support bolts, a movable force transmission pad is welded on the top of the second load transmission steel base, and the movable force transmission pad is in engagement with the first load transmission steel base.

3. The test device for the determination of the rigid core shear strength of masonry according to claim 1, characterized in that The top of the jack seat is connected with a hydraulic loading device.

4. The testing device for the straight core shear loading of masonry according to claim 1, characterized in that: A load sensor is arranged between the piston rod of the hydraulic jack and the movable force transmission pad.

5. A test method for a test device for the right-angle shear loading of masonry, according to any one of claims 1 to 4, characterized in that: The method comprises the following steps: S1, preparing a masonry sample; S2, placing one corner of the masonry sample prepared in S1 on the first load transmission steel base below, and then placing another first load transmission steel base at the opposite corner of the masonry sample; S3, starting the hydraulic loading device to adjust the position of the hydraulic jack through the jack seat, and starting the hydraulic jack to make the movable force transmission pad engage with the first load transmission steel base; S4, adjusting the hydraulic jack to change the magnitude of the external load of the masonry sample; S5, analyzing the performance parameter change rule of the ultimate shear bearing capacity of the masonry sample when the resultant force of the external load acts on the stiffness center of the masonry sample; S6, on the basis of S1 to S5, changing the position of the hydraulic jack relative to the movable force transmission pad, and studying the influence of the eccentric distance on the shear bearing capacity of the masonry sample.

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