Beam member load loading equipment and loading method

Abstract

The invention discloses beam member load loading equipment and a loading method, and relates to the technical field of experimental devices.The beam member load loading equipment comprises a mounting frame, a first loading device and a second loading device, a fixing device used for fixing a test piece is arranged on the mounting frame, the first loading device is mounted on the upper side of the fixing device, and the second loading device is mounted on the lower side of the fixing device; the first loading device and the second loading device can respectively load the test piece through the output ends, and the output end of the second loading device can synchronously move along the direction vertical to the axis of the test piece and the output end of the first loading device, so that the load is applied to the test piece in a reciprocating manner along the direction vertical to the axis of the test piece; and real simulation of the stress condition of the beam in the use process is realized.

Description

Technical Field

[0001] The present invention relates to the technical field of experimental devices, and particularly to a beam member load loading device and a loading method. Background Art

[0002] As a core load-bearing member in projects such as buildings and bridges, the safety of a beam structure is directly related to the stability of the overall structure. To ensure the reliability of a beam under the design load, it is usually necessary to verify its bearing capacity, deformation characteristics, and failure mode through load simulation experiments.

[0003] Currently, the loading experiments on beam structures in the industry mainly rely on static loading, such as heavy object loading, air pressure loading, shaking tables, and hydraulic loading, to verify the strength, stiffness, and ultimate bearing capacity of the beam under static loads (such as self-weight and equipment weight).

[0004] However, in the actual application process of a beam, it is often required to withstand high-frequency and reciprocating dynamic loads under the influence of environmental factors such as earthquakes and wind vibrations. Therefore, it is difficult to simulate the true stress state of the beam in the actual use process through the existing static loading devices. Summary of the Invention

[0005] The purpose of the present invention is to provide a beam member load loading device, which realizes the dynamic loading of the load through a first loading device and a second loading device whose output ends can move synchronously along the direction perpendicular to the axis of the specimen.

[0006] To achieve the above purpose, the present invention provides the following solutions: The present invention provides a beam member load loading device, including: A mounting frame, on which a fixing device for fixing the specimen is provided; A first loading device, which is installed on the mounting frame, is located above the fixing device, the output end of the first loading device can extend or retract along the direction perpendicular to the axis of the specimen, and the first loading device can provide a load for the specimen in the direction perpendicular to the axis of the specimen; A second loading device, which is installed on the mounting frame, is located below the fixing device, the second loading device is arranged corresponding to the first loading device along the direction perpendicular to the axis of the specimen, the output end of the second loading device can extend or retract along the direction perpendicular to the axis of the specimen, the second loading device can provide a load for the specimen in the direction perpendicular to the axis of the specimen, and the output end of the second loading device can move synchronously with the output end of the first loading device along the direction perpendicular to the axis of the specimen.

[0007] As an embodiment, adjustment grooves are provided on the columns of the mounting frame, the adjustment grooves extend along the height direction of the columns, and the fixing device is installed in the adjustment grooves and can move along the extending direction of the adjustment grooves.

[0008] As an embodiment, the fixing device includes two first clamping beams and two second clamping beams. The two first clamping beams are arranged vertically and are installed between the two columns on one side of the mounting frame by bolts. There is a first gap for installing the test piece between the two first clamping beams. The two second clamping beams are arranged vertically and are installed between the two columns on the other side of the mounting frame by bolts. There is a second gap for installing the test piece between the two second clamping beams. It further includes two first reinforcing bars and two second reinforcing bars. The two first reinforcing bars penetrate through the two first clamping beams in the vertical direction, the two first reinforcing bars are arranged at intervals, external threads are provided on the two first reinforcing bars, and first nuts are provided at both ends of the two first reinforcing bars. The two second reinforcing bars penetrate through the two second clamping beams in the vertical direction, the two second reinforcing bars are arranged at intervals, external threads are provided on the two second reinforcing bars, and second nuts are provided at both ends of the two second reinforcing bars.

[0009] As an embodiment, rollers are provided between the test piece and the two first clamping beams and between the test piece and the two second clamping beams to form simply supported constraints.

[0010] As an embodiment, the first loading device includes a first jack, a main loading beam, and an auxiliary loading beam. The first jack is installed on the mounting frame through a first cross beam. The output shaft of the first jack is connected to the middle of the main loading beam. There are two auxiliary loading beams. Two first transmission members are arranged at intervals on the side of the main loading beam away from the first jack. The two first transmission members are respectively connected to the middle of the two auxiliary loading beams. The side of the auxiliary loading beam away from the main loading beam is used to provide pressure for the test piece.

[0011] As an embodiment, a second transmission member is installed on the side of the auxiliary loading beam away from the main loading beam. The second transmission member includes a mounting seat and an output head. The mounting seat is installed on the main loading beam. The output head is rotatably connected to the mounting seat. The rotation axis of the output head is perpendicular to the axis of the test piece.

[0012] As an embodiment, an image acquisition device is further included. The image acquisition device is installed on the mounting frame through a second cross beam, and the image acquisition device is arranged corresponding to the test piece.

[0013] As an embodiment, it further includes a strain gauge, which is used to be installed on the surface and / or inside of the test piece, and the strain gauge is signal-connected to the terminal.

[0014] The present invention also discloses a method for loading a beam member, including: Step S1: Fix the test piece between the first loading device and the second loading device, and make the output ends of the first loading device and the second loading device respectively abut against the test piece; Step S2: The first loading device extends in the direction close to the test piece to apply a load to the test piece, and the second loading device retracts synchronously in the direction away from the test piece; Step S3: When the test piece deforms to a certain extent, the first loading device retracts in the direction away from the test piece, and the second loading device extends synchronously in the direction close to the test piece to apply a load to the test piece in the direction opposite to that in Step S2; Step S4: When the test piece deforms reversely to a certain extent, repeat Step S2 - Step S3 until the loading experiment ends.

[0015] As an embodiment, Step S4 further includes: monitoring the displacement change rate of the test piece through a displacement detection device, and when the displacement change rate per minute is less than 5% of the total deformation amount, recording the change process of the test piece through a measuring device.

[0016] The present invention has achieved the following technical effects compared with the prior art: In the beam member load loading device disclosed by the present invention, the fixing device on the mounting frame can fix the test piece. The first loading device installed on the upper side of the fixing device and the second loading device installed on the lower side of the fixing device can provide a load in the direction perpendicular to the axis of the test piece through the telescopic output ends, and the output ends of the first loading device and the second loading device move synchronously. When the output end of the first loading device extends downward, the output end of the second loading device moves downward synchronously, and a downward load can be applied to the test piece during this process. When the test piece deforms to a certain extent, the output end of the second loading device extends upward, and the output end of the first loading device moves upward synchronously, and an upward load can be applied to the test piece during this process. Repeating the above process can apply a reciprocating load to the test piece in the direction perpendicular to the axis of the test piece, realizing a true simulation of the stress condition of the beam during use. Description of the Drawings

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0018] Figure 1 Structural schematic diagram of the beam member load loading device in the embodiment of the present invention; Figure 2 is Figure 1 side view schematic diagram of; Figure 3 is Figure 1 top view schematic diagram of; Figure 4 is Figure 1 schematic diagram of another perspective; Figure 5 Schematic diagram of the auxiliary loading beam in the embodiment of the present invention; Figure 6 Schematic diagram of the fixing device in the embodiment of the present invention; Figure 7 Schematic diagram of the second cross beam in the embodiment of the present invention; Figure 8 Schematic diagram of the installation of the steel bar strain gauge in the embodiment of the present invention; Figure 9 Schematic diagram of the installation of the concrete strain gauge in the embodiment of the present invention; Among them, 1. mounting frame; 2. specimen; 3. first loading device; 4. fixing device; 5. second loading device; 6. adjustment groove; 7. first clamping beam; 8. second clamping beam; 9. first reinforcing bar; 10. second reinforcing bar; 11. roller; 12. first jack; 13. main loading beam; 14. auxiliary loading beam; 15. first cross beam; 16. first transmission member; 17. mounting seat; 18. output head; 19. image acquisition device; 20. second cross beam; 21. connecting plate; 22. first longitudinal beam; 23. sliding groove; 24. auxiliary plate; 25. steel bar strain gauge; 26. concrete strain gauge; 27. column; 28. steel bar. Detailed implementation manners

[0019] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0020] The purpose of the present invention is to provide a beam member load loading device to solve the problems existing in the prior art, enabling the beam member load loading device to apply dynamic loads to the specimen and realizing a true simulation of the stress condition of the beam during use.

[0021] To make the above objects, features and advantages of the present invention more obvious and understandable, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific implementation manners.

[0022] Please refer to Figures 1-9 In the embodiment of the present invention, the beam member load loading device disclosed includes: a mounting frame 1, a first loading device 3, and a second loading device 5; wherein, a fixing device 4 is provided on the mounting frame 1, and the fixing device 4 is used to fix the test piece 2. Both the first loading device 3 and the second loading device 5 are mounted on the mounting frame 1. The first loading device 3 is located above the fixing device 4, and the output end of the first loading device 3 can extend or retract along the direction perpendicular to the axis of the test piece 2. The first loading device 3 can provide a load on the test piece 2 in the direction perpendicular to the axis of the test piece 2. The second loading device 5 is located below the fixing device 4, and the second loading device 5 is arranged corresponding to the first loading device 3 along the direction perpendicular to the axis of the test piece 2. The output end of the second loading device 5 can extend or retract along the direction perpendicular to the axis of the test piece 2. The second loading device 5 can provide a load on the test piece 2 in the direction perpendicular to the axis of the test piece 2. The output end of the second loading device 5 can move synchronously with the output end of the first loading device 3 along the direction perpendicular to the axis of the test piece 2; its working principle is: the test piece 2 is installed on the fixing device 4, and the output ends of both the first loading device 3 and the second loading device 5 extend towards the test piece 2 and abut against the test piece 2. Taking the output end of the first loading device 3 applying the load first as an example, the output end of the first loading device 3 extends downward, and at the same time the output end of the second loading device 5 moves downward synchronously. During this process, the loading device can apply a downward load to the test piece 2. After the test piece 2 deforms to a certain extent, the output end of the second loading device 5 extends upward, and at the same time the output end of the first loading device 3 moves upward synchronously. During this process, the loading device can apply an upward load to the test piece 2. By circulating like this, a reciprocating load can be applied to the test piece 2 along the direction perpendicular to the axis of the test piece 2, realizing a true simulation of the stress condition of the beam during use, and providing a scientific basis for the use of the test piece 2 in the actual working process.

[0023] It can be understood that the test piece 2 can be a beam applied to building structures such as subways, bridges, and houses. In this embodiment, the test piece 2 is a slab beam applied to a subway station.

[0024] In this embodiment, an adjustment groove 6 is provided on the column 27 of the mounting frame 1. The adjustment groove 6 extends along the height direction of the column 27. The fixing device 4 is installed in the adjustment groove 6, and the installation position of the fixing device 4 can be adjusted up and down along the extension direction of the adjustment groove 6, so that the test piece 2 can be fixed at different height positions to match different working conditions, improving the adaptability of the device.

[0025] In this embodiment, there are four columns 27. The four columns 27 are vertically arranged, and the four columns 27 are arranged in a rectangular pattern. Specifically, the four columns 27 enclose a rectangle, and the four columns 27 are respectively located at the four corners of the rectangle.

[0026] In this embodiment, the fixing device 4 includes two first clamping beams 7 and two second clamping beams 8. The two first clamping beams 7 are arranged vertically and are installed between two columns 27 on one side of the mounting frame 1 by bolts. There is a first gap for installing the specimen 2 between the two first clamping beams 7. The two second clamping beams 8 are arranged vertically and are installed between two columns 27 on the other side of the mounting frame 1 by bolts. There is a second gap for installing the specimen 2 between the two second clamping beams 8. The first clamping beam 7 and the second clamping beam 8 can respectively clamp both ends of the specimen 2 to fix the specimen 2. By means of bolt connection, the height adjustment of the first clamping beam 7 and the second clamping beam 8 is realized, and thus the height of the specimen 2 can be adjusted.

[0027] Furthermore, connecting plates 21 are provided at both ends of the first clamping beam 7 and the second clamping beam 8. Threaded holes are provided in the connecting plates 21, and a number of threaded holes are provided in the columns 27 in the vertical direction. Thus, the first clamping beam 7 and the second clamping beam 8 can be installed at different height positions by bolts.

[0028] In this embodiment, connecting plates 21 are provided at both ends of the first clamping beam 7 and the second clamping beam 8. Threaded holes are provided in the connecting plates 21. Different from the previous embodiment, no threaded holes are provided in the columns 27 in this embodiment. As the bolts are screwed into the threaded holes in the connecting plates 21, the ends of the bolts will gradually abut against the bottom of the adjustment groove 6. Thus, the first clamping beam 7 and the second clamping beam 8 can be fixed on the columns 27 by the extrusion force. This connection method can realize stepless adjustment of the height of the first clamping beam 7 and the second clamping beam 8.

[0029] In this embodiment, it further includes two first reinforcing rods 9 and two second reinforcing rods 10. The two first reinforcing rods 9 penetrate through the two first clamping beams 7 in the vertical direction. The two first reinforcing rods 9 are arranged at intervals. External threads are provided on the two first reinforcing rods 9. First nuts are provided at both ends of the two first reinforcing rods 9. By tightening the first nuts, the two first nuts can provide a force that makes the first clamping beams 7 approach each other. On the one hand, the specimen 2 can be fixed more firmly, and on the other hand, the deformation of the first clamping beam 7 during the loading process can be reduced. The two second reinforcing rods 10 penetrate through the two second clamping beams 8 in the vertical direction. The two second reinforcing rods 10 are arranged at intervals. External threads are provided on the two second reinforcing rods 10. Second nuts are provided at both ends of the two second reinforcing rods 10. By tightening the second nuts, the two second nuts can provide a force that makes the second clamping beams 8 approach each other. On the one hand, the specimen 2 can be fixed more firmly, and on the other hand, the deformation of the first clamping beam 7 during the loading process can be reduced.

[0030] Furthermore, gaskets are provided between the first nuts and the first clamping beams 7, and between the second nuts and the second clamping beams 8.

[0031] In this embodiment, rollers 11 are provided between the test piece 2 and the two first clamping beams 7, and between the test piece 2 and the two second clamping beams 8, forming a simply supported constraint. The rollers 11 are equivalent to a translational support, allowing the test piece 2 to translate in the horizontal direction, thereby accurately reproducing the sliding boundary in actual engineering, eliminating the stress distortion caused by fixed constraints, and making the stress state of the test piece 2 closer to the working condition in actual application.

[0032] In this embodiment, the first loading device 3 includes a first jack 12, a main loading beam 13, and an auxiliary loading beam 14. The first jack 12 is installed on the mounting frame 1 through a first cross beam 15. The output shaft of the first jack 12 is connected to the middle of the main loading beam 13. There are two auxiliary loading beams 14. Two first transmission members 16 are spaced apart on the side of the main loading beam 13 away from the first jack 12. The two first transmission members 16 are respectively connected to the middle of the two auxiliary loading beams 14. The side of the auxiliary loading beam 14 away from the main loading beam 13 is used to provide pressure to the test piece 2. The pressure provided by the first jack 12 is transmitted from the main loading beam 13 to the auxiliary loading beam 14 through the first transmission member 16, and then transmitted from the auxiliary loading beam 14 to the test piece 2, enabling the device to uniformly load the test piece 2 with a load.

[0033] In this embodiment, first longitudinal beams 22 are provided between the two columns 27 on the left side of the mounting frame 1 and between the two columns 27 on the right side. A plurality of threaded holes are provided on both first longitudinal beams 22. The first cross beam 15 is bolted to the first longitudinal beams 22 on both sides, thereby providing a supporting force for the first jack 12. Moreover, the threaded connection method enables the position of the first cross beam 15 to be adjustable, meeting the requirements of test pieces 2 of different sizes and different load application points, and improving the adaptability of the device. Of course, instead of providing threaded holes on the first longitudinal beams 22, the first cross beam 15 can also be fixed between the first longitudinal beams 22 by abutting against the first longitudinal beams 22 with bolts, and its connection method is the same as the connection method between the first clamping beam 7 and the column 27.

[0034] In this embodiment, the first longitudinal beam 22 is detachably connected to the column 27 by bolts, and the installation position of the first longitudinal beam 22 can be adjusted along the height direction of the column 27.

[0035] In this embodiment, the first transmission member 16 is a universal hinge. The test piece 2 will deform under the load state, and the universal hinge can adjust the angle in two or more directions, compensating for the offset or inclination of the axis while transmitting torque. That is, when the test piece 2 deforms, the universal hinge can allow the auxiliary loading beam 14 to tilt to a certain extent to ensure that the auxiliary loading beam 14 can stably transmit the load to the test piece 2.

[0036] In this embodiment, a second conduction member is installed on the side of the secondary loading beam 14 away from the main loading beam 13. There are multiple second conduction members, and the multiple second conduction members are arranged at intervals along the axial direction of the test piece 2, which can further improve the uniformity of the load applied to the test piece 2.

[0037] In this embodiment, the second conduction member includes a mounting base 17 and an output head 18. The mounting base 17 is installed on the main loading beam 13, and the output head 18 is rotatably connected to the mounting base 17. The rotation axis of the output head 18 is perpendicular to the axis of the test piece 2. The output head 18 can rotate relative to the mounting base 17 to adapt to the deformation generated when the test piece 2 is stressed, ensuring that the output head 18 can always stably abut against the test piece 2 and ensuring the uniformity of the load received by the test piece 2.

[0038] In this embodiment, the setting form of the second loading device 5 is the same as that of the first loading device 3, which will not be elaborated here.

[0039] In this embodiment, the thrusts of the first jack 12 and the second jack can be read. Specifically, a jack with a reading function can be directly used as the first jack 12 and the second jack to apply the load, or pressure measuring devices can be provided between the base of the first jack 12 and the corresponding main loading beam 13 and between the base of the second jack and the corresponding main loading beam 13.

[0040] In this embodiment, the beam member load loading device further includes an image acquisition device 19. The image acquisition device 19 is installed on the mounting frame 1 through the second cross beam 20. The image acquisition device 19 is arranged corresponding to the test piece 2. The deformation process of the test piece 2 can be recorded in real time through the image acquisition device 19, providing a reference for the mechanical property analysis of the test piece 2.

[0041] Furthermore, there are two groups of image acquisition devices 19. The two groups of image acquisition devices 19 are respectively installed on the front side and the rear side of the test piece 2 through two second cross beams 20 to monitor the test piece 2 from multiple directions.

[0042] In this embodiment, one of the second cross beams 20 is installed between the two columns 27 on the front side of the mounting frame 1, and the other second cross beam 20 is installed between the two columns 27 on the rear side. The two second cross beams 20 are both connected to the columns 27 by bolts, thereby realizing the height adjustment and detachable setting of the second cross beam 20.

[0043] In this embodiment, the image acquisition device 19 is connected to the second crossbeam 20 through a multi-joint robotic arm. The first end of the robotic arm is connected to the image acquisition device 19. A sliding groove 23 is provided on the second crossbeam 20. The second end of the robotic arm is slidably installed in the sliding groove 23, thereby being able to drive the image acquisition device 19 to move along the axis direction of the test piece 2. The loading state of the test piece 2 is observed in full time and space in the form of a robotic arm to achieve more comprehensive monitoring and recording.

[0044] In this embodiment, the second crossbeam 20 is slidably mounted on the column 27 and is capable of moving up and down along the column 27. Furthermore, a locking device is provided between the second crossbeam 20 and the column 27 to secure the second crossbeam 20 at a certain height relative to the column 27. The locking device may be a known structure such as a bolt or a buckle.

[0045] It can be understood that the multi-joint robotic arm is a common structure in the prior art and will not be elaborated here. In addition, the sliding of the robotic arm can be achieved by manual manipulation or by automatic drive through a screw-nut structure. When the screw-nut mechanism is adopted, the nut is connected to the second end of the robotic arm, and the screw is arranged along the extension direction of the sliding groove 23; the image acquisition device 19 is a high-speed or high-precision camera.

[0046] In this embodiment, the beam component load loading device also includes a strain gauge, which is used to be installed on the surface and / or inside of the specimen 2. The strain gauge is connected to the terminal signal. The strain gauge can directly reflect the strain condition of the specimen 2 and provide a reference for the mechanical performance analysis of the specimen 2.

[0047] In this embodiment, the strain gauge includes a steel bar strain gauge 25 and a concrete strain gauge 26. The steel bar strain gauge 25 is attached to the steel bar 28 inside the specimen 2, and the concrete strain gauge 26 is attached to the surface of the specimen 2. Specifically, the beam specimens 2 are all reinforced concrete structures with steel bars 28 cast inside. Before pouring, the steel bar strain gauge 25 is attached to the steel bar 28, and then pouring is carried out. After pouring is completed, the concrete strain gauge 26 is attached to the surface of the specimen 2 as needed.

[0048] In this embodiment, draw-wire displacement sensors are installed on the bottom and side of the specimen 2 , and the deformation and displacement of the specimen 2 can be recorded by the draw-wire displacement sensors, providing a reference for the mechanical property analysis of the specimen 2 .

[0049] In this embodiment, the image acquisition device 19, the wire-type displacement sensor, the steel bar strain gauge 25 and the concrete strain gauge 26 are all connected to the terminal signal. Further, the terminal is a computer.

[0050] In this embodiment, the upright column 27 , the first transverse beam 15 , the first clamping beam 7 , the second clamping beam 8 and the first longitudinal beam 22 are all I-beams.

[0051] In this embodiment, an auxiliary plate 24 is provided at the bottom end of the column 27. The auxiliary plate 24 extends outward in a direction perpendicular to the column 27, and threaded holes are formed in the auxiliary plate 24, so that the column 27 can be fixed at the target position through bolts.

[0052] Furthermore, a reinforcing rib plate is provided between the auxiliary plate 24 and the column 27 to increase the stability of the device.

[0053] Using the above device, cyclic loading can be carried out on the load distribution form of the prefabricated subway station roof slab during actual use, including conducting tests on plate specimens 2 of different sizes, different concrete strength grades, and different loading points to evaluate the mechanical deformation performance of the plate components.

[0054] The present invention also provides a method for loading the load of a beam member, including: Step S1: Fix and install the specimen 2 between the first loading device 3 and the second loading device 5, and make the output ends of the first loading device 3 and the second loading device 5 respectively abut against the specimen 2; Step S2: The first loading device 3 extends in the direction close to the specimen 2 to apply a load to the specimen 2, and the second loading device 5 retracts synchronously in the direction away from the specimen 2; Step S3: When the specimen 2 deforms to a certain extent, the first loading device 3 retracts in the direction away from the specimen 2, and the second loading device 5 extends synchronously in the direction close to the specimen 2 to apply a load to the specimen 2 in the direction opposite to that in Step S2; Step S4: When the specimen 2 deforms in the reverse direction to a certain extent, repeat Step S2 - Step S3 until the loading experiment ends; Through the above operations, a dynamic load is applied to the specimen 2, and the direction of the dynamic load is reciprocally applied to the specimen 2 along the direction perpendicular to the axis of the specimen 2, realizing a true simulation of the stress condition of the beam during use.

[0055] It can be understood that the degree of deformation of the specimen 2 can be adaptively adjusted according to actual needs.

[0056] In this embodiment, Step S4 further includes: monitoring the displacement change rate of the specimen 2 through a displacement detection device. When the displacement change rate per minute is less than 5% of the total deformation amount, record the change process of the specimen 2 through a measuring device. This process is the preloading process. When the displacement increment per minute of the specimen 2 under a constant load is less than 5% of the total deformation amount, it is considered that the load applied to the specimen 2 is stable at this time, and then record the change process of the specimen 2 again, improving the stability and accuracy of the recorded data.

[0057] In this embodiment, the measuring device includes an image acquisition device 19, a wire-pulling displacement sensor, a steel bar strain gauge 25, a concrete strain gauge 26, etc. All the above devices are signal-connected to a computer.

[0058] In this embodiment, in step S1, the staff can set the boundary for the beam specimen 2 according to the test boundary design. If it is a simply supported constraint, rollers 11 are respectively arranged between the specimen 2 and the two first clamping beams 7 and between the specimen 2 and the two second clamping beams 8 in advance. If it is a fixed constraint, the above rollers 11 are not arranged. Further, pads are arranged between the rollers 11 and the specimen 2, between the rollers 11 and the first clamping beam 7, or between the rollers 11 and the second clamping beam 8.

[0059] In this embodiment, in step S1, the staff can transport the specimen 2 to above the steel support through the specimen 2 transport vehicle. Specifically, the specimen 2 transport vehicle is a trolley with lifting and walking functions. This is prior art and will not be elaborated too much.

[0060] In the present invention, specific examples are used to illustrate the principle and implementation manner of the present invention. The description of the above embodiments is only used to help understand the method and its core idea of the present invention; at the same time, for those of ordinary skill in the art, according to the idea of the present invention, there will be changes in the specific implementation manner and application scope. In summary, the content of this specification should not be construed as a limitation to the present invention.

Claims

1. A beam member load loading device, characterized in that, Including: A mounting bracket (1), on which a fixing device (4) for fixing a test piece (2) is provided; A first loading device (3), which is mounted on the mounting bracket (1), the first loading device (3) is located above the fixing device (4), the output end of the first loading device (3) can extend or retract along the direction perpendicular to the axis of the test piece (2), and the first loading device (3) can provide a load in the direction perpendicular to the axis of the test piece (2) for the test piece (2); A second loading device (5), which is mounted on the mounting bracket (1), the second loading device (5) is located below the fixing device (4), the second loading device (5) is arranged corresponding to the first loading device (3) along the direction perpendicular to the axis of the test piece (2), the output end of the second loading device (5) can extend or retract along the direction perpendicular to the axis of the test piece (2), the second loading device (5) can provide a load in the direction perpendicular to the axis of the test piece (2) for the test piece (2), and the output end of the second loading device (5) can move synchronously with the output end of the first loading device (3) along the direction perpendicular to the axis of the test piece (2).

2. The beam member load loading device according to claim 1, characterized in that, An adjustment groove (6) is provided on the column (27) of the mounting bracket (1), the adjustment groove (6) extends along the height direction of the column (27), the fixing device (4) is installed in the adjustment groove (6) and can move along the extending direction of the adjustment groove (6).

3. The beam member load loading device according to claim 2, wherein The fixing device (4) includes two first clamping beams (7) and two second clamping beams (8), the two first clamping beams (7) are arranged vertically and are installed between two columns (27) on one side of the mounting bracket (1) by bolts, there is a first gap for installing the test piece (2) between the two first clamping beams (7), the two second clamping beams (8) are arranged vertically and are installed between two columns (27) on the other side of the mounting bracket (1) by bolts, there is a second gap for installing the test piece (2) between the two second clamping beams (8), and further includes two first reinforcing bars (9) and two second reinforcing bars (10), the two first reinforcing bars (9) penetrate through the two first clamping beams (7) vertically, the two first reinforcing bars (9) are arranged at intervals, external threads are provided on the two first reinforcing bars (9), first nuts are provided at both ends of the two first reinforcing bars (9), the two second reinforcing bars (10) penetrate through the two second clamping beams (8) vertically, the two second reinforcing bars (10) are arranged at intervals, external threads are provided on the two second reinforcing bars (10), and second nuts are provided at both ends of the two second reinforcing bars (10).

4. The beam member load loading device according to claim 3, characterized in that, Rollers (11) are provided between the test piece (2) and the two first clamping beams (7), and between the test piece (2) and the two second clamping beams (8) to form a simply supported constraint.

5. The beam member load loading device according to claim 1, characterized in that The first loading device (3) includes a first jack (12), a main loading beam (13), and an auxiliary loading beam (14). The first jack (12) is installed on the mounting frame (1) through a first cross beam (15). The output shaft of the first jack (12) is connected to the middle of the main loading beam (13). There are two auxiliary loading beams (14). On one side of the main loading beam (13) away from the first jack (12), two first transmission members (16) are arranged at intervals. The two first transmission members (16) are respectively connected to the middle parts of the two auxiliary loading beams (14). The side of the auxiliary loading beam (14) away from the main loading beam (13) is used to provide pressure to the specimen (2).

6. The beam member load loading device according to claim 5, characterized in that, A second transmission member is installed on the side of the auxiliary loading beam (14) away from the main loading beam (13). The second transmission member includes a mounting seat (17) and an output head (18). The mounting seat (17) is installed on the main loading beam (13). The output head (18) is rotatably connected to the mounting seat (17). The axis of rotation of the output head (18) is perpendicular to the axis of the specimen (2).

7. The beam member load loading device according to claim 1, characterized in that An image acquisition device (19) is further included. The image acquisition device (19) is installed on the mounting frame (1) through a second cross beam (20). The image acquisition device (19) is arranged corresponding to the specimen (2).

8. The beam member load loading device according to claim 1, wherein, A strain gauge is further included. The strain gauge is used to be installed on the surface and / or inside of the specimen (2). The strain gauge is signal-connected to a terminal.

9. A method for loading a beam member, characterized in that, It includes: Step S1: Fix and install the specimen (2) between the first loading device (3) and the second loading device (5), and make the output ends of the first loading device (3) and the second loading device (5) respectively abut against the specimen (2). Step S2: The first loading device (3) extends in the direction close to the specimen (2) to apply a load to the specimen (2), and the second loading device (5) retracts synchronously in the direction away from the specimen (2). Step S3: When the specimen (2) deforms to a set degree, the first loading device (3) retracts in the direction away from the specimen (2), and the second loading device (5) extends synchronously in the direction close to the specimen (2) to apply a load to the specimen (2) in the direction opposite to that in Step S2). Step S4: When the specimen (2) deforms reversely to a set degree, repeat Step S2 - Step S3 until the loading experiment ends.

10. The beam member load loading method according to claim 9, characterized in that, Step S4 further includes: Monitoring the displacement change rate of the specimen (2) through a displacement detection device. When the displacement change rate per minute is less than 5% of the total deformation amount, record the change process of the specimen (2) through a measuring device.

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