Push-out test loading device considering application of transverse load

Abstract

The utility model discloses a push-out test loading device considering application of a transverse load, which belongs to the technical field of building structure tests and comprises a vertical threaded connecting rod sequentially penetrating through a lower end plate, a support plate and an upper end plate. Two parallel steel plates are arranged on the supporting plate and connected through a transverse threaded connecting rod. A test piece is placed between the steel plate and the transverse threaded connecting rod and on the supporting plate; a vertical load sensor is arranged above the test piece; arranging a transverse load sensor between the test piece and the steel plate; second nuts are in threaded connection with the transverse threaded connecting rods on the side, away from the test piece, of the steel plate; and first nuts are in threaded connection with the vertical threaded connecting rods on the upper and lower sides of the lower end plate and the upper end plate. The first nut or the second nut is adjusted, the value of the vertical or transverse load sensor is read at the same time, and the magnitude of applied vertical or transverse load is controlled. And by fixing the first nut or the second nut, constant load application on the test piece in the transverse direction or the vertical direction is realized.

Description

Technical Field

[0001] The utility model belongs to the technical field of building structure testing, and in particular relates to a push-out test loading device considering the application of a lateral load. Background Art

[0002] The statements in this section merely provide background technical information related to the present invention and do not necessarily constitute prior art.

[0003] The shear performance test of steel-concrete composite beam shear connectors is often carried out by push-out test to determine the shear performance of steel-concrete composite beam shear connectors.

[0004] Currently, in push-out tests of shear connectors in steel-concrete composite beams, lateral pull-out forces are typically applied using jacks. However, long-term loading with jacks can lead to "pressure relief," which reduces the applied lateral load. This makes it impossible to maintain long-term stable lateral load, thus affecting the accuracy of the test results. Utility Model Content

[0005] In response to the above problems, the present invention provides a push-out test loading device that takes into account the application of lateral loads. The device can control the size of the applied vertical load or lateral load by adjusting the first nut or the second nut on the vertical threaded connecting rod or the lateral threaded screw and reading the value of the vertical load sensor or the lateral load sensor at the same time; and can achieve constant application of load to the test piece in the lateral or vertical direction by fixing the first nut or the second nut; the overall structure of the device is simpler and easy to use, which solves the "pressure relief" problem of the jack during the loading process.

[0006] In order to achieve the above purpose, the present invention adopts the following technical solutions:

[0007] A push-out test loading device that considers applying a transverse load includes a vertical threaded connecting rod that passes through a lower end plate, a support plate, and an upper end plate in sequence from bottom to top; two parallel steel plates are set on the support plate, and the steel plates are connected by a transverse threaded connecting rod; a steel-concrete structure test piece is placed on the support plate between the steel plates and the transverse threaded connecting rod;

[0008] A vertical load sensor is set above the specimen;

[0009] A transverse load sensor is set between the specimen and the steel plate;

[0010] On the side of the steel plate away from the test piece, the transverse threaded connecting rods are all threadedly connected with a second nut;

[0011] First nuts are threadedly connected to the vertical threaded connecting rods on the upper and lower sides of the lower end plate and the upper end plate.

[0012] Preferably, a plurality of vertical pads are arranged above the vertical load sensor, and the bottom of the upper end plate is in close contact with the top of the uppermost vertical pad.

[0013] Preferably, the transverse load sensor is provided with a socket on the side facing the specimen, a thin screw is inserted into the socket, and the thin screw is in close contact with the specimen; a plurality of transverse pads are provided between the transverse load sensor and the steel plate.

[0014] Preferably, each of the four corner ends of the support plate is provided with a large circular hole, and the large circular hole is used to pass the vertical threaded connecting rod.

[0015] Preferably, the sizes of the upper and lower end plates are consistent with those of the support plate, and the large circular holes are also provided at the same positions of the four corner ends of the upper and lower end plates; the diameter of the vertical threaded connecting rod is smaller than the diameter of the large circular hole.

[0016] Preferably, two small circular holes are opened at both ends of the steel plate for passing the transverse threaded connecting rod; the diameter of the transverse threaded connecting rod is smaller than the diameter of the small circular hole; the length of the transverse threaded connecting rod is longer than the width of the specimen.

[0017] Preferably, the number of the vertical threaded connecting rods and the number of the horizontal threaded connecting rods are four.

[0018] Preferably, a spring is provided between the lower end plate and the support plate, and the spring is sleeved on the vertical threaded connecting rod.

[0019] Preferably, on the upper side of the upper end plate, there are multiple first nuts on each vertical threaded connecting rod.

[0020] Preferably, on the side of the steel plate away from the test piece, there are multiple second nuts on each transverse threaded connecting rod.

[0021] Compared with the prior art, the advantages and positive effects of this utility model are:

[0022] This utility model enables concrete push-out tests on steel-concrete structure specimens under vertical and lateral loads. By adjusting the first or second nut on the vertical threaded connecting rod or the horizontal threaded screw, and simultaneously reading the values of the vertical load sensor or the horizontal load sensor, the applied vertical or lateral load can be controlled. Furthermore, by fixing the first or second nut, a constant horizontal or vertical load can be applied to the specimen. The device has a simpler overall structure and is easy to use, resolving the "pressure relief" problem that can occur with jacks during loading. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The drawings in the specification, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention.

[0024] Figure 1 This is an overall schematic diagram of the test device of an embodiment of the utility model;

[0025] Figure 2 This is a front view of a test device according to an embodiment of the present utility model;

[0026] Figure 3 It is a side view of the test device of the embodiment of the utility model;

[0027] Figure 4 is a top view of a support plate according to an embodiment of the present invention;

[0028] Figure 5 It is a side view of a steel plate according to an embodiment of the present invention;

[0029] Figure 6 This is a schematic diagram of a nut according to an embodiment of the present utility model;

[0030] In the figure: 1. Vertical threaded connecting rod; 2. Upper end plate; 3. First nut; 4. Support plate; 5. Lower end plate; 6. Spring; 7. Horizontal threaded connecting rod; 8. Steel plate; 9. Second nut; 10. Vertical spacer; 11. Vertical load sensor; 12. Test piece; 13. Thin screw; 14. Horizontal load sensor; 15. Horizontal spacer. DETAILED DESCRIPTION

[0031] It should be noted that the following detailed descriptions are illustrative and intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used herein have the same meanings as those commonly understood by those skilled in the art to which the present invention belongs.

[0032] The present invention will be described in detail below with reference to the accompanying drawings. This embodiment discloses a push-out test loading device that takes into account the application of a lateral load, such as Figure 1 As shown, it includes four vertical threaded connecting rods 1, which pass through the lower end plate 5, the support plate 4 and the upper end plate 2 in sequence from bottom to top; Figure 1 、 Figure 4 As shown, two parallel steel plates 8 are provided on the support plate 4, and the steel plates 8 are connected by a transverse threaded connecting rod 7; between the steel plates 8 and the transverse threaded connecting rod 7, a steel-concrete structure specimen 12 to be tested is placed on the support plate 4.

[0033] like Figure 1 、 Figure 2 、 Figure 3As shown, a vertical load sensor 11 is arranged above the specimen 12, and multiple vertical pads 10 are arranged above the vertical load sensor 11. The bottom of the upper end plate 2 is in close contact with the top of the uppermost vertical pad 10. The vertical pad 10 plays a role in transferring the vertical load and filling the gap between the vertical load sensor 11 and the upper end plate 2.

[0034] like Figure 1 、 Figure 2 、 Figure 3 As shown, a thin screw 13, a transverse load sensor 14, and transverse spacers 15 are sequentially positioned between the specimen 12 and the steel plate 8. It is important to note that the transverse load sensor 14 has a socket on the side facing the specimen 12, into which the thin screw 13 can be inserted, ensuring close contact with the specimen. The diameter of the thin screw must match the transverse load sensor socket to facilitate the transmission of transverse loads. Several transverse spacers 15 are placed between the other side of the transverse load sensor 14 and the steel plate 8 to transfer the transverse load and fill the gap between them.

[0035] like Figure 4 As shown, each of the four corner ends of the support plate 4 is provided with a large circular hole, and the four large circular holes form a square. The large circular holes are used to pass the vertical threaded connecting rod 1. It can be understood that the size of the upper end plate 2 and the lower end plate 5 is consistent with that of the support plate 4, and the four corner ends of the upper end plate 2 and the lower end plate 5 are also provided with large circular holes at the same position; Figure 5 As shown, two small circular holes are opened at both ends of the steel plate 8, one above the other, for passing the transverse threaded connecting rod 7. It should be noted that the diameter of the vertical threaded connecting rod is 2 mm smaller than the diameter of the large circular hole, the diameter of the transverse threaded connecting rod is 2 mm smaller than the diameter of the small circular hole, and the length of the transverse threaded connecting rod is 200 to 300 mm longer than the width of the specimen.

[0036] like Figure 1 、 Figure 2 、 Figure 3 As shown, a spring 6 is provided between the lower end plate 5 and the support plate 4. The spring 6 is sleeved on the vertical threaded connecting rod 1 and is used to protect and buffer the support plate 4 when placing and loading the test piece.

[0037] like Figure 1 、 Figure 2 、 Figure 3As shown, on the side of the steel plate 8 away from the test piece 12, the transverse threaded connecting rod 7 is threaded with a second nut 9; when the staff uses a tool such as a wrench to twist the second nut 9 toward the side of the test piece 12, the steel plate 8 can be used to apply a load to the transverse pad to squeeze the test piece 12, thereby applying a transverse load to the test piece 12; at the same time, the magnitude of the applied load is obtained according to the transverse load sensor. When the transverse applied load reaches the set value, the second nut 9 is stopped from being twisted. At this time, the steel plate 8 continues to squeeze the test piece 12, causing it to bear a constant transverse load. It is understandable that on the side of the steel plate away from the test piece, there is more than one second nut on each transverse threaded connecting rod. In order to ensure stability when applying a transverse load, there are multiple second nuts on each transverse threaded connecting rod on the side of the steel plate away from the test piece.

[0038] like Figure 1 、 Figure 2 、 Figure 3 As shown, first nuts 3 are threadedly connected to the vertical threaded connecting rod 1 on the upper and lower sides of the lower end plate 5; by connecting the first nuts 3 on the upper and lower sides of the lower end plate 5, the lower end plate 5 can be fixed in a certain position and will not move up and down.

[0039] like Figure 1 、 Figure 2 、 Figure 3 As shown, first nuts 3 are threadedly connected to the vertical threaded connecting rod 1 on the upper and lower sides of the upper end plate 2; the first function is that when no test is carried out, the upper end plate 2 can be fixed in a certain position and will not move up and down; the second function is that the distance between the upper end plate 2 and the support plate 4 can be adjusted according to the actual needs of the specimen 12 to expand the scope of application of the device; the third function is that the staff uses a tool such as a wrench to unscrew the first nut 3 on the lower side of the upper end plate 2 so that the bottom of the upper end plate 2 contacts the top of the vertical pad, and then screws the first nut 3 on the lower side of the upper end plate 2 so that the upper end plate 2 squeezes the specimen 12 through the vertical pad, thereby achieving the application of a vertical load to the specimen 12; at the same time, the size of the applied load is obtained according to the vertical load sensor. When the vertical applied load reaches the set value, the first nut on the upper side of the upper end plate 2 is stopped from being screwed. At this time, the upper end plate 2 continues to squeeze the specimen 12, so that it bears a constant vertical load. It is understandable that there is more than one first nut on each vertical threaded connecting rod on the upper side of the upper end plate. In order to ensure stability when applying a lateral load, there are multiple first nuts 3 on each vertical threaded connecting rod on the upper side of the upper end plate 2.

[0040] like Figure 6 As shown, the first nut and the second nut are both hexagonal nuts, the difference being the diameter of the internal threads. It can be understood that the threads on the vertical threaded connecting rod and the horizontal threaded connecting rod are arranged in a common manner.

[0041] Using a push-out test loading device that considers applying a lateral load according to this embodiment, the test is performed according to the following steps:

[0042] Step 1: Place the test piece 12 on the support plate 4 and pass the transverse threaded connecting rod 7 through the steel plate 8;

[0043] Step 2: Place the vertical load sensor 11 and multiple vertical spacers 10 on the test piece 12 in sequence;

[0044] Step 3: Rotate the first nut 3 on the lower side of the upper end plate 2 to below the uppermost vertical spacer 10, adjust the first nut 3 on the upper side of the upper end plate 2 so that the steel plate is in close contact with the vertical spacer 10, continue to adjust the first nut 3 on the upper side of the upper end plate 2, apply a vertical load to the specimen 12, and when the predetermined vertical load value is reached, fix the first nut 3 on the upper side of the upper end plate 2 so that the upper end plate 2 constantly applies a vertical load to the specimen 12;

[0045] Step 4: Place a transverse load sensor 14, a thin screw 13, and multiple spacers 15 between the steel plate 8 and the test piece 12. By adjusting the second nuts 9 on both sides of the steel plate, the thin screw 13 is in close contact with the test piece 12 and squeezes the test piece 12, thereby adding a transverse load. When the predetermined transverse load value is reached, fix the second nuts on the opposite sides of the steel plate 8 so that the steel plate applies a constant transverse load to the test piece 12.

[0046] Although the above description of the specific implementation methods of the present invention is combined with the accompanying drawings, it does not limit the scope of protection of the present invention. Technical personnel in the relevant field should understand that on the basis of the technical solution of the present invention, various modifications or deformations that can be made by technical personnel in this field without creative work are still within the scope of protection of the present invention.

Claims

1. A push-out test loading device considering the application of lateral load, characterized in that: It includes a vertical threaded connecting rod, which passes through the lower end plate, the support plate and the upper end plate from bottom to top; two parallel steel plates are set on the support plate, and the steel plates are connected by a transverse threaded connecting rod; a steel-concrete structure specimen is placed on the support plate between the steel plates and the transverse threaded connecting rod; A vertical load sensor is set above the specimen; A transverse load sensor is set between the specimen and the steel plate; On the side of the steel plate away from the test piece, the transverse threaded connecting rods are all threadedly connected with a second nut; First nuts are threadedly connected to the vertical threaded connecting rods on the upper and lower sides of the lower end plate and the upper end plate.

2. A push-out test loading device considering the application of lateral load as claimed in claim 1, characterized in that: A plurality of vertical pads are arranged above the vertical load sensor, and the bottom of the upper end plate is in close contact with the top of the uppermost vertical pad.

3. A push-out test loading device considering the application of lateral load as claimed in claim 1, characterized in that: The transverse load sensor is provided with a socket on the side facing the specimen, a thin screw is inserted into the socket, and the thin screw is in close contact with the specimen; a plurality of transverse pads are provided between the transverse load sensor and the steel plate.

4. A push-out test loading device considering the application of lateral load as claimed in claim 1, characterized in that: The four corner ends of the support plate are each provided with a large circular hole, and the large circular hole is used to pass the vertical threaded connecting rod.

5. A push-out test loading device considering the application of lateral load as claimed in claim 4, characterized in that: The sizes of the upper and lower end plates are consistent with those of the support plate, and the large circular holes are also provided at the same positions of the four corner ends of the upper and lower end plates; the diameter of the vertical threaded connecting rod is smaller than that of the large circular hole.

6. A push-out test loading device considering the application of lateral load as claimed in claim 1, characterized in that: Two small circular holes are opened at both ends of the steel plate for passing the transverse threaded connecting rod; the diameter of the transverse threaded connecting rod is smaller than the diameter of the small circular hole; the length of the transverse threaded connecting rod is longer than the width of the test piece.

7. A push-out test loading device considering the application of lateral load as claimed in claim 1, characterized in that: The number of the vertical threaded connecting rods and the number of the horizontal threaded connecting rods are both four.

8. A push-out test loading device considering the application of lateral load as claimed in claim 1, characterized in that: A spring is arranged between the lower end plate and the support plate, and the spring is sleeved on the vertical threaded connecting rod.

9. A push-out test loading device considering the application of lateral load as claimed in claim 1, characterized in that: On the upper side of the upper end plate, there are multiple first nuts on each vertical threaded connecting rod.

10. The push-out test loading device considering the application of lateral load as claimed in claim 1, characterized in that: On the side of the steel plate away from the test piece, there are multiple second nuts on each transverse threaded connecting rod.

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