Test device and test method for masonry rigid core shear loading

Abstract

The invention discloses a test device and a test method for masonry rigid core shear loading, and belongs to the technical field of masonry measurement, the test device comprises a loading support, a jack clamping seat is arranged on the loading support, a hydraulic jack is installed at the bottom of the jack clamping seat, the bottom of a piston rod of the hydraulic jack is connected with a movable force transmission cushion block, and the movable force transmission cushion block is connected with a hydraulic cylinder. And the movable force transfer cushion block is connected with the first load transfer steel seat. According to the test device and the test method for masonry rigid core shear loading, the position of the hydraulic jack is changed, so that the action position of an external load can be changed, and the resultant force of the external load acts on the rigid center of a masonry sample, so that the masonry sample is subjected to pure shear damage; the load transfer lower steel seat is fixed on the base through a support bolt, so that the load transfer lower steel seat is convenient to disassemble and replace, and can adapt to different masonry samples.

Description

Technical Field

[0001] The invention relates to the technical field of masonry measurement, in particular to a test device and a test method for masonry rigid core shear loading. Background Art

[0002] The existing shear test method for brick masonry is to perform diagonal shear loading on the brick masonry wall, using the full-interface direct loading method. The load is concentrated at the centroid of the specimen. The specimen does not fail in pure shear, but is affected by the in-plane bending moment, and there are errors in the test results. Existing masonry specimens usually use a single-sided reinforcement method. The masonry specimens do not fail in pure shear. Due to the uneven stiffness between the reinforcement material and the masonry of the reinforced masonry, during the diagonal shear test, the single-sided reinforced specimens are usually affected by the in-plane bending moment, and there are errors in the test results. Summary of the invention

[0003] The purpose of the present invention is to provide a test device and a test method for shear loading of the rigid center of masonry. By changing the position of the hydraulic jack, the position of the external load can be changed, so that the combined force of the external load acts on the rigidity center of the masonry specimen, thereby causing pure shear failure of the masonry specimen. The load-transmitting steel seat is fixed to the base by support bolts, which is convenient for disassembly and replacement, so that the load-transmitting steel seat can adapt to different masonry specimens.

[0004] To achieve the above-mentioned purpose, the present invention provides a test device and a test method for masonry rigid core shear loading, including a loading bracket, a jack socket is provided on the loading bracket, a hydraulic jack is installed at the bottom of the jack socket, the bottom of the piston rod of the hydraulic jack is connected to a movable force transmission pad, and the movable force transmission pad is connected to a first load transmission steel seat.

[0005] Preferably, the first load transfer steel seat is a combined steel plate with grooves, the first load transfer steel seat and the movable force transfer pad are snap-connected, the number of first load transfer steel seats and the number of movable force transfer pads are both two, and the two first load transfer steel seats have the same shape, both are V-shaped.

[0006] Preferably, a base is provided under the jack socket, a second load-transferring steel seat is fixed to the top of the base by support bolts, a movable force-transferring pad is welded to the top of the second load-transferring steel seat, and the top of the movable force-transferring pad is engaged and connected with the first load-transferring steel seat.

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

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

[0009] A test method for masonry rigid core shear loading, comprising the following steps: S1. Prepare masonry specimens; S2, placing one corner of the masonry specimen prepared in S1 on the first load transfer steel seat below, and then placing another first load transfer steel seat at the opposite corner of the masonry specimen; S3, start the hydraulic loading device to adjust the position of the hydraulic jack through the jack holder, start the hydraulic jack, and make the movable force transmission pad engage with the first load transmission steel seat; S4. Adjust the hydraulic jack to change the magnitude of the applied load on the masonry specimen; S5. Analyze the variation law of performance parameters of the ultimate shear bearing capacity of masonry specimens when the combined force of external loads acts on the stiffness center of masonry specimens; S6. Based on S1 to S5, the position of the hydraulic jack relative to the movable force transfer pad is changed to study the effect of eccentricity on the shear bearing capacity of the masonry specimen.

[0010] Therefore, the present invention adopts the above-mentioned test device and test method for shear loading of masonry rigid center, and changes the position of the hydraulic jack to realize the change of the position of the external load, so that the combined force of the external load acts on the rigidity center of the masonry specimen, thereby causing pure shear failure of the masonry specimen. The load-transmitting steel seat is fixed to the base by support bolts, which is convenient for disassembly and replacement, so that the load-transmitting steel seat can adapt to different masonry specimens.

[0011] The technical solution of the present invention is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a three-dimensional structural schematic diagram of a test device for masonry rigid core shear loading according to the present invention; Figure 2 It is a three-dimensional structural schematic diagram of a hydraulic jack, a movable force transfer pad and a load transfer upper steel seat of a test device for masonry rigid core shear loading of the present invention; Figure 3 It is a three-dimensional structural schematic diagram of a steel seat under load transfer of a test device for masonry rigid core shear loading of the present invention; Figure 4 The present invention is a three-dimensional structural schematic diagram of a test device base for masonry rigid core shear loading.

[0013] Reference numerals 1. Masonry specimen; 2. Loading bracket; 3. First load-transfer steel seat; 4. Second load-transfer steel seat; 5. Movable force-transfer pad; 6. Hydraulic jack; 7. Jack holder; 8. Support bolts; 9. Base. DETAILED DESCRIPTION

[0014] The technical solution of the present invention is further described below through the accompanying drawings and embodiments.

[0015] Unless otherwise defined, the technical terms or scientific terms used in the present invention should be understood by people with ordinary skills in the field to which the present invention belongs. The words "first", "second" and similar words used in the present invention do not indicate any order, quantity or importance, but are only used to distinguish different components. "Include" or "comprise" and similar words mean that the elements or objects appearing before the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. "Connect" or "connected" and similar words are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0016] Embodiment 1 like Figures 1 to 4 As shown, the present invention provides a test device for masonry rigid core shear loading, comprising a loading bracket 2, on which a jack holder 7 is provided, and the loading bracket 2 provides support for the jack holder 7. The top of the jack holder 7 is connected to a hydraulic loading device, which adopts the method of the prior art and can realize multi-directional loading through multiple hydraulic cylinders and a direction controller, and can flexibly adjust the loading direction and angle, thereby driving the jack holder 7 to move.

[0017] A hydraulic jack 6 is installed at the bottom of the jack holder 7. 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 specimen 1 acts on the stiffness center of the masonry specimen 1. The bottom of the piston rod of the hydraulic jack 6 is connected to the movable force transmission pad 5, and a load sensor is provided between the piston rod of the hydraulic jack 6 and the movable force transmission pad 5. The position of the hydraulic jack 6 is moved by moving the jack holder 7, and it is embedded in the movable force transmission pad 5 and fixed. By changing the position and size of the movable force transmission pad 5, the external load of the masonry specimen 1 can be adjusted to achieve continuous testing with different eccentricities.

[0018] The movable force transfer pad 5 is connected to the first load transfer steel seat 3. The first load transfer steel seat 3 is a combined steel plate with grooves. The first load transfer steel seat 3 and the movable force transfer pad 5 are engaged and connected to form a force transfer whole. The width and spacing of the grooves on the first load transfer steel seat 3 can be adjusted and designed according to the masonry sample 1. A caliper is provided on the top of the movable force transfer pad 5. The caliper can ensure the precise position and height of the movable force transfer pad, thereby ensuring that the force transmission is more uniform and accurate. The spacing between each set of calipers should be controlled at 10~50mm, and the height of each caliper should be uniformly controlled at 10~30mm.

[0019] There are two first load-transfer steel seats 3 and two movable force-transfer pads 5. The two first load-transfer steel seats 3 have the same shape of V-shape. The height of the first load-transfer steel seat 3 should be controlled at 100~300mm, and the width should be 10~50mm. A base 9 is provided under the jack seat 7. The base 9 is fixed on the ground. The height of the base 9 is 500~1500mm. The second load-transfer steel seat 4 is fixed to the top of the base 9 by support bolts 8, which can maintain stability and facilitate disassembly when replacement is needed. A movable force-transfer pad 5 is welded on the top of the second load-transfer steel seat 4. The top of the movable force-transfer pad 5 is engaged with the first load-transfer steel seat 3, which can support the bottom of the masonry specimen 1 and facilitate shear testing.

[0020] Embodiment 2 A test method for masonry rigid core shear loading, using a test device for masonry rigid core shear loading of embodiment 1, comprises the following steps: S1. Prepare masonry specimen 1; S2, placing one corner of the masonry sample 1 prepared in S1 on the first load transfer steel seat 3 below, and then placing another first load transfer steel seat 3 at the opposite corner of the masonry sample 1; S3, start the hydraulic loading device to adjust the position of the hydraulic jack 6 through the jack holder 7, start the hydraulic jack 6, so that the movable force transmission pad 5 is engaged with the first load transmission steel seat 3; S4, adjusting the hydraulic jack 6 to change the magnitude of the applied load on the masonry specimen 1; S5. Analyze the variation law of the performance parameters of the ultimate shear bearing capacity of masonry specimen 1 when the resultant force of the external load acts on the stiffness center of masonry specimen 1; The shear bearing capacity conversion coefficient between centroidal force and rigid center force is proposed, and the coefficient ranges from 0.80 to 0.95.

[0021] S6. Based on S1 to S5, the position of the hydraulic jack 6 relative to the movable force transfer pad 5 is changed to study the influence of the eccentricity on the shear bearing capacity of the masonry specimen 1.

[0022] Therefore, the present invention adopts the above-mentioned test device and test method for shear loading of masonry rigid center, and changes the position of the hydraulic jack to realize the change of the position of the external load, so that the combined force of the external load acts on the rigidity center of the masonry specimen, thereby causing pure shear failure of the masonry specimen. The load-transmitting steel seat is fixed to the base by support bolts, which is convenient for disassembly and replacement, so that the load-transmitting steel seat can adapt to different masonry specimens.

[0023] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that they can still modify or replace the technical solution of the present invention with equivalents, and these modifications or equivalent replacements cannot cause the modified technical solution to deviate from the spirit and scope of the technical solution of the present invention.

Claims

1. A test device for masonry rigid core shear loading, characterized in that: It comprises a loading bracket, a jack holder is arranged on the loading bracket, a hydraulic jack is installed at the bottom of the jack holder, the bottom of 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 seat.

2. A test device for masonry rigid core shear loading according to claim 1, characterized in that: The first load-transfer steel seat is a combined steel plate with grooves. The first load-transfer steel seat and the movable force-transfer pad are engaged with each other. The number of the first load-transfer steel seats and the number of the movable force-transfer pads are both two, and the two first load-transfer steel seats have the same shape, which is V-shaped.

3. A test device for masonry rigid core shear loading according to claim 2, characterized in that: A base is provided below the jack socket, a second load-transfer steel seat is fixed to the top of the base by support bolts, a movable force-transfer pad is welded to the top of the second load-transfer steel seat, and the top of the movable force-transfer pad is engaged and connected with the first load-transfer steel seat.

4. A test device for masonry rigid core shear loading according to claim 1, characterized in that: The top of the jack seat is connected to the hydraulic loading device.

5. A test device for masonry rigid core shear loading 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.

6. A test method for a test device for masonry rigid core shear loading according to any one of claims 1 to 5, characterized in that: The following steps are involved: S1. Prepare masonry specimens; S2, placing one corner of the masonry specimen prepared in S1 on the first load transfer steel seat below, and then placing another first load transfer steel seat at the opposite corner of the masonry specimen; S3, start the hydraulic loading device to adjust the position of the hydraulic jack through the jack holder, start the hydraulic jack, and make the movable force transmission pad engage with the first load transmission steel seat; S4. Adjust the hydraulic jack to change the magnitude of the applied load on the masonry specimen; S5. Analyze the variation law of performance parameters of the ultimate shear bearing capacity of masonry specimens when the combined force of external loads acts on the stiffness center of masonry specimens; S6. Based on S1 to S5, the position of the hydraulic jack relative to the movable force transfer pad is changed to study the effect of eccentricity on the shear bearing capacity of the masonry specimen.

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