Profiled steel sheet group nail bearing capacity test device and use method

Abstract

The invention discloses a profiled steel sheet group nail bearing capacity test device and a using method, the test device comprises a top frame and a bottom frame which are used for bearing profiled steel sheets, a temporary fixing device is arranged between the top frame and the bottom frame, and loading equipment connecting devices are arranged on the upper side of the top frame and the lower side of the bottom frame. And a data acquisition device connected with the profiled steel sheet is arranged on one side of the top frame / bottom frame. According to the invention, adverse effects on the profiled steel sheet caused by possible relative displacement of the frame in the installation process of the test device can be effectively prevented, additional loads generated by direct clamping loading of the loading end are avoided, and the accuracy and reliability of test results are improved. In addition, the test equipment is convenient to install, simple to operate and reusable, greatly reduces the test cost, improves the resource utilization rate, and has a wide application market and a good development prospect.

Description

Technical Field

[0001] The present invention relates to the technical field of building steel structures, and more specifically to a corrugated steel plate nail group bearing capacity testing device and a use method thereof. Background Art

[0002] In order to meet the needs of integrated construction of steel structure and roof, it is generally necessary to conduct a group nail shear performance test on the self-tapping nail connection node between the roof corrugated steel sheet and the lower purlin to study its node bearing capacity, node failure form and node failure definition. However, there is a relative lack of research on the performance of the group nail connection between the corrugated steel sheet and the purlin, especially the lack of special test equipment to support this research. Due to the generally thin thickness characteristics of the roof corrugated steel sheet material, the slightest carelessness during the installation of the test device may cause unnecessary deformation of the steel plate or introduce additional stress, thereby affecting the accuracy of the test results. In addition, the traditional method of directly using a clamp to clamp and load at the loading end makes it difficult to ensure that the specimen is only subjected to axial tension, which will also interfere with the reliability and validity of the test data. Therefore, we need to develop or optimize the existing test equipment to overcome these technical difficulties and ensure that the group nail shear performance test can accurately reflect the performance of the connection node under actual working conditions.

[0003] In view of this, this application is made. Summary of the invention

[0004] The invention provides a corrugated steel plate group nail bearing capacity test device and a use method thereof, which has the advantages of simple installation and disassembly, less adverse effect on the corrugated steel plate during the installation process, uniform force distribution on the test piece, and reusable device.

[0005] To achieve the above-mentioned purpose, the present invention adopts the following technical scheme: a corrugated steel plate group nail bearing capacity test device, comprising a top frame and a bottom frame for bearing the corrugated steel plate, a temporary fixing device is arranged between the top frame and the bottom frame, a loading device connecting device is arranged on the upper side of the top frame and the lower side of the bottom frame, and a data acquisition device connected to the corrugated steel plate is arranged on one side of the top frame / bottom frame.

[0006] Furthermore, the top frame and the bottom frame are both integral U-shaped structures, the top frame includes a top crossbeam and outer vertical frames on both sides, and the bottom frame includes a bottom crossbeam and inner vertical frames on both sides.

[0007] Furthermore, the temporary fixing device comprises a limiting strip one arranged between the outer vertical frame and the inner vertical frame, one end of the limiting strip one is installed on the outer vertical frame and can be rotated and tightened to adjust.

[0008] Furthermore, the temporary fixing device also includes a second limiting strip arranged between the top crossbeam and the inner vertical plate, one end of the limiting strip is rotatably mounted on the top crossbeam, and the other end is detachably connected to the inner vertical frame.

[0009] Furthermore, the first limiting slat and the second limiting slat are installed by means of tension bolts.

[0010] Furthermore, the limiting strip is installed on the front and back of the top frame.

[0011] Further, the second limiting slat is installed on the back side of the top frame.

[0012] Furthermore, scale lines are provided on the top crossbeam and the bottom crossbeam.

[0013] Furthermore, the data acquisition device includes a data acquisition instrument and a self-folding thin plate connected to the point to be measured on the corrugated steel plate, a displacement meter is connected to the free end of the self-folding thin plate, and the displacement meter is connected to the data acquisition instrument.

[0014] The method for using the above-mentioned corrugated steel plate group nail bearing capacity test device mainly includes the following steps: 1. Weld the frame. Cut the steel of appropriate length according to the test requirements, weld them to form the top frame and the bottom frame, and use tension bolts to fix multiple limit steel strips 1 on the outer vertical frame on the front of the top frame. The initial installation direction of the limit strips 1 is parallel to the direction of the outer vertical frame. Similarly, install multiple limit strips 1 and multiple limit strips 2 on the back of the top frame. Weld the loading end connecting plate on the side where the corrugated steel plate is to be installed on the top beam and bottom beam of the top frame; 2. Assemble the steel frame. After the assembly is completed, loosen the tension bolts, rotate the limiting steel strip 1 and the limiting steel strip 2 by 90 degrees, and tighten the tension bolts to limit the horizontal direction of the bottom steel frame. Install the second tension bolt on the limiting steel strip 2, and fix the other end of the limiting steel strip 2 on the top beam to temporarily limit the relative displacement of the top frame and the bottom frame. 3. Install the corrugated steel sheet, adjust the installation position of the corrugated steel sheet by the scale line, install the self-tapping screws at the trough position of the corrugated steel sheet, and the connection line of the self-tapping screw group should be straight; 4. Install the test device. Install the test device on the test loading platform. The test device and the test loading platform are connected by a pin shaft. After the installation is completed, remove a loose bolt of the second limit plate; 5. Arrange the data acquisition device, paste the self-folding thin steel plate near the point to be measured, connect the free end of the self-folding thin steel plate to the displacement meter, and fix the displacement meter to other fixed equipment in the laboratory through a clamp; 6. Preload, apply a pre-tension force not exceeding 5% of the specified strength or expected yield strength, ensure that the specimen is aligned with the chuck and the specimen is straight; 7. Loading test: load the test device and collect and record the test data through the data acquisition instrument.

[0015] In summary, the invention has the following beneficial effects: (1) The frame of the present invention realizes stable horizontal limitation of the frame structure by means of a plurality of limit slats fixed by one bolt. At the same time, a plurality of limit slats fixed by two bolts are arranged on the back of the frame to temporarily fix the frame structure, thereby effectively preventing the adverse effect of relative displacement of the frame on the nail group shear test during the test, thereby ensuring the smoothness and accuracy of the entire installation process. Furthermore, the slats do not need to be removed during the test, which is simple to operate and has high installation efficiency.

[0016] (2) The present invention adopts a pin-connected test device and a loading device. The test piece can achieve uniform force distribution through deflection, avoiding the additional load generated by direct clamping connection loading in the traditional method, thereby improving the accuracy and reliability of the test results.

[0017] (3) The design of the test device of the present invention fully considers practicality and convenience, and the installation and disassembly process is simple and quick. In addition, due to its reusable characteristics, it greatly reduces the test cost and improves resource utilization. It has a broad application market and good development prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the overall structure of the corrugated steel plate group nail bearing capacity test device of the present invention; Figure 2 This is a schematic diagram of the detailed structure of the front side of the steel frame structure before the corrugated steel plate of the present invention is installed; Figure 3 This is a schematic diagram of the detailed structure of the back of the steel frame structure before the corrugated steel plate of the present invention is installed; Figure 4 This is a bottom bottom view of the steel frame structure after the corrugated steel sheet of the present invention is installed; Figure 5 It is a schematic diagram of the connection between the clamping device and the test device of the corrugated steel frame structure loading test bench of the present invention.

[0019] Marking instructions: 1. Top frame; 11. Top crossbeam; 12. Outer vertical frame; 13. Upper scale line; 14. Limit slat 1; 15. Tension bolt; 2. Bottom frame; 21. Bottom crossbeam; 22. Inner vertical frame; 23. Lower scale line; 24. Limit slat 2; 3. Corrugated steel plate; 4. Self-tapping screws; 5. Loading equipment connection device, 51. L-shaped connecting plate; 52. Pin; 6. Data acquisition device; 61. Self-folding thin plate; 62. Displacement meter; 63. Data acquisition instrument; 7. Test loading platform. DETAILED DESCRIPTION

[0020] The following is combined with Figures 1 to 5 The specific implementation methods of the corrugated steel plate nail group bearing capacity testing device and the use method of the present invention are further described in detail.

[0021] like Figure 1 As shown, a corrugated steel plate group nail bearing capacity test device includes a top frame 1, a bottom frame 2, a corrugated steel plate 3, self-tapping screws 4, a loading device connection device 5 and a data acquisition device 6. The frame structure should preferably use high-quality profiles such as square steel, flat steel, channel steel or H-shaped steel. When using closed steel pipe profiles such as square steel and flat steel, it should be ensured that the internal space of the steel pipe is large enough to prevent the loose bolts 15 from being unable to be installed. One end of the corrugated steel plate 3 is fixed to the top frame 1, and the other end is fixed to the bottom frame 2. The corrugated steel plate 3 is connected to the frame structure by self-tapping screws 4. The loading device connection device 5 is installed on the top frame 1 and the bottom frame 2.

[0022] A plurality of 1 mm thick self-folding thin plates 61 with dimensions of L20×30 mm and a length of 30 mm are installed on the corrugated steel plate 3. One end of the self-folding thin plate 61 is fixed to the corrugated steel plate 3 by AB glue, and the other end is pressed against the spring of the displacement meter 62. The deformation of the displacement meter 62 is collected by the data acquisition instrument 63, and the displacement deformation of multiple test points can be measured.

[0023] like Figure 2 As shown, the top steel frame 1 is welded by a top crossbeam 11 and two outer vertical frames 12, and a plurality of 10 mm thick limit strips 14 are fixed to the outer vertical frame 12 by a tension bolt 15. The limit strips 14 can be rotatably fixed by the tension bolt 15 to horizontally limit the bottom steel frame 2; the bottom frame 2 is welded by a bottom crossbeam 21 and two inner vertical frames 22. The thickness of the top crossbeam 11 and the bottom crossbeam 21 should be consistent with the thickness of the purlin in actual working conditions.

[0024] The top crossbeam 11 and the bottom crossbeam 21 are respectively provided with upper scale lines 13 and lower scale lines 23 distributed along the length direction. The scale line 0 is located in the middle of the crossbeam. The position of the corrugated steel sheet 3 can be adjusted according to the scale lines during installation to ensure that the corrugated steel sheet 3 is straight and centered.

[0025] like Figure 3 As shown, a plurality of limiting slats 24 are installed on the back of the bottom frame 2. The limiting slats 24 are made of 10 mm thick rectangular steel slats. The top frame 1 and the bottom frame 2 are temporarily connected and fixed by two tension bolts 15. After the test device is installed on the loading device, one of the tension bolts 15 of the limiting steel slats 24 is removed to release the temporary fixation of the two frames, and only horizontal limiting is performed.

[0026] like Figure 4As shown, a loading device connection device 5 is installed on the top crossbeam 11 and the bottom crossbeam 21. The loading device connection device 5 includes a loading end connection plate 51 and a pin 52. The loading end connection plate 51 can be made of a 10 mm thick L-shaped steel plate, a rectangular steel plate, a T-shaped steel plate, etc., welded to the side of the frame or close to the top / top edge to ensure that the pin hole position and the self-tapping screw drilling position are coplanar from top to bottom.

[0027] like Figure 5 As shown, the test device is connected to the loading device via a pin shaft 52 for loading, and both ends of the test device can deflect around the pin shaft, and uniform distribution of force can be achieved through deflection.

[0028] A method for using a corrugated steel plate group nail bearing capacity test device comprises the following steps: 1. Welding the frame: Cut the steel of appropriate length according to the test requirements, weld them to form the top frame 1 and the bottom frame 2, and use the tension bolts 15 to fix the multiple limit strips 14 on the outer vertical frame 12 on the front of the top frame. The initial installation direction of the limit strips 14 is parallel to the direction of the outer vertical frame 12. Similarly, install multiple limit strips 14 and multiple limit strips 24 on the back of the frame. Weld the loading end connecting plate 51 on the side where the corrugated steel plate 3 is to be installed on the top crossbeam 11 and the bottom crossbeam 21 of the frame.

[0029] 2. Assemble the frame. After the assembly is completed, loosen the tension bolt 15, rotate the limit strip 14 and the limit strip 24 by 90 degrees, and then tighten the tension bolt 15 to limit the horizontal direction of the bottom frame 2. Install the second tension bolt 15 on the limit strip 24, and fix the other end of the limit strip 24 on the top beam 11 to temporarily limit the relative displacement of the top frame 1 and the bottom frame 2.

[0030] 3. Install the corrugated steel sheet 3, adjust the installation position of the corrugated steel sheet 3 by the scale line 12, install the self-tapping screws 4 at the trough position of the corrugated steel sheet 3, and the connection line of the self-tapping screw group should be straight.

[0031] 4. Installation of the test device: Install the test device on the test loading platform 7. The test device and the test loading platform 7 are connected via a pin 52. After the installation is completed, remove a tension bolt 15 of the second limit strip 24.

[0032] 5. Arrange the data acquisition device 6, paste the self-folding thin plate 61 near the point to be measured, connect the displacement meter 62 to the free end of the self-folding thin plate 61, and fix the displacement meter 62 to other fixed equipment in the laboratory through a clamp.

[0033] 6. Preload: Apply a pre-tension force not exceeding 5% of the specified strength or expected yield strength to ensure that the specimen is aligned with the chuck and the specimen is straight.

[0034] 7. Loading test: Load the test device and collect and record the test data through the data acquisition device 63.

[0035] The above is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments. All technical solutions under the concept of the present invention belong to the protection scope of the present invention. It should be pointed out that for ordinary technicians in this technical field, some improvements and modifications without departing from the principle of the present invention should also be regarded as the protection scope of the present invention.

Claims

1. A corrugated steel plate nail group bearing capacity test device, characterized in that: It includes a top frame and a bottom frame for carrying corrugated steel plates, a temporary fixing device is arranged between the top frame and the bottom frame, a loading equipment connecting device is arranged on the upper side of the top frame and the lower side of the bottom frame, and a data acquisition device connected to the corrugated steel plate is arranged on one side of the top frame / bottom frame.

2. The corrugated steel plate group nail bearing capacity test device according to claim 1, characterized in that: The top frame and the bottom frame are both integral U-shaped structures. The top frame includes a top crossbeam and outer vertical frames on both sides, and the bottom frame includes a bottom crossbeam and inner vertical frames on both sides.

3. The corrugated steel plate nail group bearing capacity test device according to claim 2, characterized in that: The temporary fixing device comprises a limiting strip one arranged between the outer vertical frame and the inner vertical frame, one end of the limiting strip one is installed on the outer vertical frame and can be rotated and tightened for adjustment.

4. The corrugated steel plate nail group bearing capacity test device according to claim 3, characterized in that: The temporary fixing device also includes a second limiting plate strip arranged between the top crossbeam and the inner vertical plate, one end of the second limiting plate strip is rotatably installed on the top crossbeam, and the other end is detachably connected to the inner vertical frame.

5. The corrugated steel plate nail group bearing capacity test device according to claim 4, characterized in that: The first limiting slat and the second limiting slat are installed by means of tension bolts.

6. The corrugated steel plate group nail bearing capacity test device according to claim 3, characterized in that: The limiting strips are installed on the front and back sides of the top frame.

7. The corrugated steel plate nail group bearing capacity test device according to claim 4, characterized in that: The second limiting slat is installed on the back side of the top frame.

8. The corrugated steel plate nail group bearing capacity test device according to claim 1, characterized in that: The top crossbeam and the bottom crossbeam are both provided with scale lines.

9. The corrugated steel plate nail group bearing capacity test device according to claim 1, characterized in that: The data acquisition device comprises a data acquisition instrument and a self-folding thin plate connected to the point to be measured on the corrugated steel plate. The free end of the self-folding thin plate is connected to a displacement meter, which is connected to the data acquisition instrument.

10. The method for using the corrugated steel plate nail group bearing capacity test device according to any one of claims 1 to 9, characterized in that: The main steps include:

1. Weld the frame. Cut the steel of appropriate length according to the test requirements, weld them to form the top frame and the bottom frame, and use tension bolts to fix multiple limit steel strips 1 on the outer vertical frame on the front of the top frame. The initial installation direction of the limit strips 1 is parallel to the direction of the outer vertical frame. Similarly, install multiple limit strips 1 and multiple limit strips 2 on the back of the top frame. Weld the loading end connecting plate on the side where the corrugated steel plate is to be installed on the top beam and bottom beam of the top frame; 2. Assemble the steel frame. After the assembly is completed, loosen the tension bolts, rotate the limiting steel strip 1 and the limiting steel strip 2 by 90 degrees, and tighten the tension bolts to limit the horizontal direction of the bottom steel frame. Install the second tension bolt on the limiting steel strip 2, and fix the other end of the limiting steel strip 2 on the top beam to temporarily limit the relative displacement of the top frame and the bottom frame.

3. Install the corrugated steel sheet, adjust the installation position of the corrugated steel sheet by the scale line, install the self-tapping screws at the trough position of the corrugated steel sheet, and the connection line of the self-tapping screw group should be straight; 4. Install the test device. Install the test device on the test loading platform. The test device and the test loading platform are connected by a pin shaft. After the installation is completed, remove a loose bolt of the second limit plate; 5. Arrange the data acquisition device, paste the self-folding thin steel plate near the point to be measured, connect the free end of the self-folding thin steel plate to the displacement meter, and fix the displacement meter to other fixed equipment in the laboratory through a clamp; 6. Preload, apply a pre-tension force not exceeding 5% of the specified strength or expected yield strength, ensure that the specimen is aligned with the chuck and the specimen is straight; 7. Loading test: load the test device and collect and record the test data through the data acquisition instrument.

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