Lateral pressurizing reaction frame suitable for eccentric pull-out test of caulking reinforced masonry structure

Abstract

The invention discloses a lateral pressurizing counter-force frame suitable for an eccentric pull-out test of a caulking reinforced masonry structure. The lateral pressurizing counter-force frame comprises a counter-force frame system and a lateral pressurizing system, the counter-force frame system is composed of a fixed steel plate, a limiting steel plate, a bottom counter-force plate, four long screws, two short screws and the like. The lateral pressurization system is composed of a square steel pipe support, a jack, a jack bottom plate, a porous box type base plate, a square steel pipe counter-force beam, an I-shaped counter-force beam and the like. The device can adapt to test pieces with different height sizes by adjusting the position of the limiting steel plate fixing nut; the height of the jack can be adjusted by adjusting the fixing nut of the square steel tube support so as to be matched with test pieces with different heights and sizes; according to the device, lateral pressure can be provided by utilizing the internal space of the reaction frame; according to the device, the electro-hydraulic servo universal testing machine is controlled by the microcomputer to perform testing, the whole process of the testing is controlled by the microcomputer, the operation is simple, the loading requirements of different displacement rates and force rates can be met, and the testing result is reliable.

Description

Technical Field

[0001] The invention relates to the technical field of pull-out testing, in particular to a lateral pressure reaction frame suitable for an eccentric pull-out test of a caulking reinforced brickwork structure. Background Art

[0002] At present, the test device for steel bar pull-out is relatively mature, but there are few studies on the auxiliary test device for FRP strip pull-out test. The auxiliary test device for FRP surface slot reinforcement pull-out test is mainly a homemade test device with a jack or a reaction frame and a test machine. The homemade FRP-substrate single shear test loading device is complex in structure and requires the use of FRP anchors and jacks to apply pull-out force to cause single shear failure of FRP and substrate. It cannot be loaded by displacement and needs to be equipped with a jack separately, which is cumbersome to use. For masonry joint FRP reinforcement, it cannot limit the vertical splitting damage of masonry blocks perpendicular to the bed seams due to the poor integrity of the masonry during the test. When the reaction frame is used with the test machine, the existing technology requires a large lateral space to support the jack and the jack reaction plate when providing lateral pressure to ensure that the jack can transmit the force to the side of the specimen. However, the left and right sides of the microcomputer-controlled electro-hydraulic servo universal testing machine are test machine columns, and the space is limited; and the closing direction of the jaws of the microcomputer-controlled electro-hydraulic servo universal testing machine is difficult to adjust, and it is impossible to adjust the side of the specimen to the front and back of the testing machine to apply lateral pressure, which makes it impossible to provide lateral pressure to the specimen to simulate the actual stress conditions inside the specimen after reinforcement, affecting the accuracy of the pull-out load made in the test; in addition, when the prior art provides lateral pressure, a screw will pass through the front of the specimen, resulting in the need to remove the upper steel plate or remove the lateral pressure device when installing the specimen, and the installation and disassembly are very cumbersome. Summary of the invention

[0003] The present invention provides a lateral pressure reaction frame suitable for an eccentric pull-out test of a caulking reinforced masonry structure, which solves the problem that the prior art cannot prevent the separation of blocks and mortar and the splitting damage of mortar along the bed seams during the test caused by poor masonry integrity, and prevents local pressure-bearing damage during the test; and solves the problem that the prior art cannot use the internal space of the reaction frame in combination with a jack to provide lateral pressure.

[0004] In order to solve the above technical problems, the present invention provides a lateral pressure reaction frame suitable for eccentric pull-out test of caulking reinforced masonry structure, the loading device is composed of a reaction frame system and a lateral pressure system, the reaction frame system includes a fixed steel plate, a limit steel plate, a bottom reaction plate, four long screws, two short screws, fixing bolts and 24 nuts, etc.; the lateral pressure system is composed of a square steel pipe support, a jack, 2 jack fixing screws, 4 jack fixing nuts, a porous box-type pad, a square steel pipe reaction beam, an I-shaped reaction beam and 8 nuts, etc.;

[0005] The reaction frame system: the fixed steel plate, the limiting steel plate and the bottom reaction plate are arranged from top to bottom, and the four long screws pass through the fixed steel plate, the limiting steel plate and the bottom reaction plate in sequence and are fixed by nuts;

[0006] A circular hole is formed in the middle of the fixed steel plate, which is used to fix the reaction frame on the pull-out testing machine;

[0007] Wherein, the four long screws are fixed to the four corner areas of the fixed steel plate, the limiting steel plate and the bottom reaction plate, and the two short screws are fixed to the middle edge areas of the limiting steel plate and the bottom reaction plate;

[0008] The limiting steel plate and the bottom reaction plate form a specimen placement area;

[0009] A rectangular thin groove is provided from the edge to the middle of the bottom reaction plate for the entry and exit of various reinforcement materials such as the FRP plate of the pulling specimen.

[0010] Furthermore, a circular hole is opened in the middle of the fixed steel plate, and the fixing bolt is first passed through the circular hole, and then the fixing bolt is clamped by the steel bar jaws of the microcomputer-controlled electro-hydraulic servo universal testing machine to fix the reaction frame on the microcomputer-controlled electro-hydraulic servo universal testing machine.

[0011] Furthermore, the fixed steel plate, the limiting steel plate and the bottom reaction plate are all rectangular steel plates.

[0012] Lateral pressurization system: the square steel tube reaction beam and the square steel tube support are arranged on the left and right, one end of which is penetrated by the long screw of the reaction frame system, and the other end is penetrated by the short screw of the reaction frame system, and fixed by nuts;

[0013] The I-beam reaction beam is placed on the right side of the square steel tube reaction beam;

[0014] The jack, the jack base plate, and the square steel pipe support are arranged in sequence from left to right, and the jack fixing bolts pass through the jack base plate and the square steel pipe support in sequence and are fixed with the jack fixing nuts;

[0015] Among them, the square steel tube reaction beam and the square steel tube support have circular holes on the upper and lower surfaces; the jack bottom plate has circular holes on the edge; and the square steel tube support has circular holes on both side surfaces.

[0016] Furthermore, circular holes are opened on the upper and lower surfaces of the square steel tube reaction beam and the square steel tube support, and the square steel tube reaction beam and the square steel tube support are fixed at a required height using the screw rods constituting the reaction frame system.

[0017] Furthermore, the jack and the jack base plate are fixed together by welding.

[0018] Furthermore, circular holes are opened on both sides of the square steel pipe, and the jack fixing screw is used to penetrate the jack base plate and the square steel pipe support, and then the jack is fixed to the required height with the jack fixing nut.

[0019] In general, the fixed steel plate, the limit steel plate and the bottom reaction plate are connected together by four long screws and two short screws. The fixed steel plate on the top of the reaction frame is fixed to the microcomputer-controlled electro-hydraulic servo universal testing machine through round holes and fixing bolts to form a complete reaction frame structure. The square steel tube support is fixed at the required height by long screws and short screws. The jack and the jack base plate are connected together by welding. The jack base plate is fixed to the square steel tube support by the round holes on the edge and the jack fixing screws. The square steel tube reaction beam is fixed at the required height by long screws and short screws. An I-shaped reaction beam is placed on the right side of the square steel tube reaction beam to provide lateral reaction force, forming a complete lateral pressure structure, which can meet the requirements of the eccentric pull-out test of the caulking reinforced masonry structure with lateral pressure. The device is adaptive and can adjust the position of the fixing nut on the four long screws and the two short screws according to the requirements of the test, thereby adjusting the position between the limit steel plate and the bottom reaction plate to adapt to specimens of different sizes.

[0020] One or more technical solutions provided in the embodiments of the present application have at least the following technical effects or advantages:

[0021] The lateral pressure reaction frame for eccentric pull-out test of caulking reinforced masonry structure provided in the embodiment of the present application can adjust the position of the fixed steel plate and the limit steel plate by adjusting the nut position of the four long screws and the two short screws, and then adjust the space size between the limit steel plate and the bottom fixed steel plate, so that the reaction frame can be suitable for pull-out specimens of different sizes; the present device can not only carry out eccentric pull-out test of masonry caulking reinforced with FRP, steel bars and other reinforcement materials without lateral pressure, but also can carry out eccentric pull-out test of masonry caulking reinforced with FRP, steel bars and other reinforcement materials under lateral pressure. Lateral pressure is to simulate the force component perpendicular to the FRP, steel bars and other reinforcement materials and bonding materials when they are subjected to shear failure after the FRP, steel bars and other reinforcement materials are caulked to reinforce the structure. Lateral pressure can better simulate the mechanical properties of actual shear failure, and can more accurately study the caulking reinforcement of FRP, steel bars and other reinforcement materials The bonding characteristics of masonry wall shear failure; the loading device can use the lateral pressure system to limit the splitting damage of the masonry along the bed seam during the pulling process caused by the poor integrity of the masonry itself, and prevent the splitting damage from affecting the pull-out load; the loading device can limit the local compressive damage of the specimen caused by the uneven distribution of the bottom plate force during the eccentric pulling process through the limit steel plate, and prevent the premature peeling damage of FRP, steel bars and other reinforcement materials caused by local compressive damage; the loading device uses a microcomputer-controlled electro-hydraulic servo universal testing machine to complete the test, and there is no need to separately make a dedicated FRP pulling test loading device, so as to realize the computer control of the entire test process. It is simple to operate, and can adopt a variety of loading methods such as displacement and force, and the test results are accurate and reliable; the loading device can provide lateral pressure by using the internal space of the reaction frame, and there is no need to occupy additional lateral space to provide lateral pressure. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 A schematic front view of a lateral pressure reaction frame structure for an eccentric pull-out test of a caulking reinforced masonry structure provided by the present invention

[0023] Figure 2 A right side schematic diagram of a lateral pressure reaction frame structure for an eccentric pull-out test of a caulking reinforced masonry structure provided by the present invention

[0024] Figure 3 Schematic diagram of the bottom plate reaction plate provided by the present invention

[0025] Figure 4 Schematic diagram of the limiting steel plate provided by the present invention

[0026] Figure 5 Schematic diagram of the fixed steel plate provided by the present invention

[0027] Figure 6 Schematic diagram of the square steel tube support and square steel tube reaction beam provided by the present invention

[0028] Figure 7 Schematic diagram of the porous box-type pad provided by the present invention

[0029] Figure 8 Schematic diagram of the fixing bolt provided by the present invention

[0030] Fig. 9 Schematic diagram of the jack base plate provided by the present invention DETAILED DESCRIPTION

[0031] The present invention provides a lateral pressure reaction frame suitable for an eccentric pull-out test of a caulking reinforced masonry structure, which solves the problem that the prior art cannot prevent the separation of blocks and mortar and the splitting damage of mortar along the bed seams during the test caused by poor masonry integrity, and prevents local pressure-bearing damage during the test; and solves the technical problem that the prior art cannot use the internal space of the reaction frame in combination with a jack to provide lateral pressure.

[0032] In order to better understand the above-mentioned technical scheme, the above-mentioned technical scheme will be described in detail below in combination with the accompanying drawings and specific implementation methods. It should be understood that the embodiments of the present invention and the specific features in the embodiments are detailed descriptions of the technical scheme of the present application, rather than limitations on the technical scheme of the present application. In the absence of conflict, the embodiments of the present application and the technical features in the embodiments can be combined with each other.

[0033] See also Figure 1 and Figure 2 The present invention provides a lateral pressure reaction frame suitable for eccentric pull-out test of caulking reinforced masonry structure. The loading device is composed of a reaction frame system and a lateral pressure system. The reaction frame system includes a fixed steel plate 3, a limit steel plate 4, a bottom reaction plate 10, four long screws 1, two short screws 16, a fixing bolt 15 and 24 nuts 2; the lateral pressure system includes a square steel pipe support 5, a jack 8, a jack bottom plate 17, two jack fixing screws 6, four jack fixing nuts 7, a porous box-type pad 9, a square steel pipe reaction beam 11, an I-shaped reaction beam 12 and 8 nuts 2;

[0034] The reaction frame system: the fixed steel plate 3, the limiting steel plate 4 and the bottom reaction plate 10 are arranged from top to bottom, and the four long screws 1 pass through the fixed steel plate 3, the limiting steel plate 4 and the bottom reaction plate 10 in sequence and are fixed by nuts 2;

[0035] A circular hole is formed in the middle of the fixed steel plate 3, which is used to fix the reaction frame on the pull-out testing machine;

[0036] The four long screws 1 are fixed to the four corner areas of the fixed steel plate 3, the limiting steel plate 4 and the bottom reaction plate 10, and the two short screws 16 are fixed to the middle edge areas of the limiting steel plate 4 and the bottom reaction plate 10;

[0037] The limiting steel plate 4 and the bottom reaction plate 10 form an eccentric drawing specimen placement area;

[0038] A rectangular thin groove is provided from the edge to the middle of the bottom reaction plate 10 for the entry and exit of the FRP strips of the pulling specimen.

[0039] Furthermore, a circular hole is opened in the middle of the fixing steel plate 3, and the fixing bolt 15 is passed through the circular hole first, and then the fixing bolt 15 is clamped by the steel bar jaws of the microcomputer-controlled electro-hydraulic servo universal testing machine to fix the reaction frame system on the microcomputer-controlled electro-hydraulic servo universal testing machine.

[0040] Furthermore, the fixed steel plate 3, the limiting steel plate 4 and the bottom reaction plate 10 are all rectangular steel plates.

[0041] Lateral pressurization system: the square steel tube reaction beam 11 and the square steel tube support 5 are arranged on the left and right, one end of which is penetrated by the long screw rod 1 of the reaction frame system, and the other end is penetrated by the short screw rod 16 of the reaction frame system, and is fixed by the nut 2;

[0042] The I-beam reaction beam 12 is placed on the right side of the square steel tube reaction beam 11;

[0043] The jack 8, the jack base plate 17, and the square steel pipe support 5 are arranged sequentially from left to right, and the jack fixing screw 6 passes through the jack base plate 17 and the square steel pipe support 5 in sequence, and is fixed by the jack fixing nut 7;

[0044] The square steel tube reaction beam 11 and the square steel tube support 5 have circular holes on the upper and lower surfaces; the jack bottom plate 17 has circular holes on the edge; and the square steel tube support 5 has circular holes on both side surfaces.

[0045] Furthermore, circular holes are opened on the upper and lower surfaces of the square steel tube reaction beam 11 and the square steel tube support 5, and the square steel tube reaction beam 11 and the square steel tube support 5 are fixed at a required height using the long screw 1 and the short screw 16 constituting the reaction frame system.

[0046] Furthermore, the jack 8 and the jack base plate 17 are fixed together by welding.

[0047] Furthermore, circular holes are opened on both sides of the square steel tube reaction beam 11 and the square steel tube support 5, and the jack fixing screw 6 is used to penetrate the jack base plate 17 and the square steel tube support 5, and then fixed with the jack fixing nut 7, and finally the jack 8 is fixed at the required height.

[0048] In general, the fixed steel plate 3, the limit steel plate 4 and the bottom reaction plate 10 are connected together by four long screws 1 and two short screws 16. The fixed steel plate 3 at the top of the reaction frame is fixed to the microcomputer-controlled electro-hydraulic servo universal testing machine through round holes and fixing bolts 15 to form a complete reaction frame structure; the square steel pipe support 5 is fixed at the required height by the long screw 1 and the short screw 16, the jack 8 and the jack bottom plate 17 are connected together by welding, and the jack bottom plate 17 is fixed to the square steel pipe support by the round holes on the edge and the jack fixing screws 7 5; the square steel tube reaction beam 11 is also fixed at the required height by the long screw 1 and the short screw 16, and the I-shaped reaction beam 12 is placed on the right side of the square steel tube reaction beam 11 to provide lateral reaction force, forming a complete lateral pressure structure, which can meet the requirements of the eccentric pull-out test of the caulking reinforced masonry structure with lateral pressure; the device is adaptive, and the position of the fixing nut 2 on the four long screws 1 and the two short screws 16 can be adjusted according to the requirements of the test, and then the position between the limit steel plate 4 and the bottom reaction plate 10 can be adjusted to adapt to specimens of different sizes.

[0049] One or more technical solutions provided in the embodiments of the present application have at least the following technical effects or advantages:

[0050] The lateral compression reaction frame for eccentric pull-out test of caulking reinforced masonry structure provided in the embodiment of the present application can adjust the position of the fixed steel plate and the limit steel plate by adjusting the nut position of the four long screws and the two short screws, and then adjust the space size between the limit steel plate and the bottom fixed steel plate, so that the reaction frame can be suitable for pull-out specimens of different sizes; the present device can not only carry out eccentric pull-out test of masonry reinforced with caulking of FRP, steel bars and other reinforcement materials without lateral pressure, but also can carry out eccentric pull-out test of masonry reinforced with caulking of FRP, steel bars and other reinforcement materials with lateral compression. Lateral compression is to simulate the force component perpendicular to the FRP, steel bars and other reinforcement materials and bonding materials when they are subjected to shear failure after the FRP, steel bars and other reinforcement materials are caulked to reinforce the structure. Lateral compression can better simulate the mechanical properties of actual shear failure, and can more accurately study the caulking reinforcement of FRP plates, steel bars and other reinforcement materials The bonding characteristics of masonry wall shear failure; the loading device can use the lateral pressure system to limit the splitting damage of the masonry along the bed seam during the pulling process caused by the poor integrity of the masonry itself, and prevent the splitting damage from affecting the pull-out load; the loading device can limit the local compressive damage of the specimen caused by the uneven distribution of the bottom plate force during the eccentric pulling process through the limit steel plate, and prevent the premature peeling damage of FRP, steel bars and other reinforcement materials caused by local compressive damage; the loading device uses a microcomputer-controlled electro-hydraulic servo universal testing machine to complete the test, and there is no need to separately make a dedicated FRP pulling test loading device, so as to realize the computer control of the entire test process. It is simple to operate, and can adopt a variety of loading methods such as displacement and force, and the test results are accurate and reliable; the loading device can provide lateral pressure by using the internal space of the reaction frame, and there is no need to occupy additional lateral space to provide lateral pressure.

[0051] Finally, it should be noted that the above specific implementation methods 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 examples, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the spirit and scope of the technical solution of the present invention, which should be included in the scope of the claims of the present invention.

Claims

1. A lateral pressure reaction frame suitable for eccentric pull-out test of caulking reinforcement masonry structure, characterized in that: include: Reaction frame system and lateral pressure system; the reaction frame system consists of a fixed steel plate, a limit steel plate, a bottom reaction plate, four long screws, two short screws and nuts; the lateral pressure system consists of a square steel pipe support, a jack, a jack bottom plate, a jack fixing screw, a jack fixing nut, a porous box pad, a square steel pipe reaction beam, an I-shaped reaction beam and nuts; The fixed steel plate, the limiting steel plate and the bottom reaction plate are arranged from top to bottom, four long screws penetrate the fixed steel plate, the limiting steel plate and the bottom reaction plate in sequence, and two short screws penetrate the limiting steel plate and the bottom reaction plate in sequence and are fixed by nuts; The fixing steel plate and the fixing bolts are used together to be fixed on the pull-out test machine; Holes are respectively opened at both ends of the square steel tube support and the square steel tube reaction beam, which are sleeved on the long screw and the short screw and fixed with nuts; the jack and the jack base plate are welded and connected to form a jack assembly; the jack assembly uses the jack fixing screw to penetrate the square steel tube support and is fixed by the jack fixing nut; the left side of the jack assembly is protected by a porous box-type pad; an I-shaped reaction beam is placed on the right side of the square steel tube reaction beam.

2. A lateral pressure reaction frame suitable for eccentric pull-out test of caulking reinforcement masonry structure according to claim 1, characterized in that: The four long screws fix the four corner areas of the fixed steel plate, the limiting steel plate and the bottom reaction plate, and the two short screws fix the middle edge area of ​​the limiting steel plate and the bottom reaction plate.

3. A lateral pressure reaction frame suitable for eccentric pull-out test of caulking reinforcement masonry structure according to claim 1, characterized in that: A test piece placement area can be formed between the limiting steel plate and the bottom reaction plate.

4. A lateral pressure reaction frame suitable for eccentric pull-out test of caulking reinforcement masonry structure according to claim 1, characterized in that: A rectangular thin groove is cut at the bottom of the bottom reaction plate to allow various reinforcement materials such as FRP plates to enter.

5. A lateral pressure reaction frame suitable for eccentric pull-out test of caulking reinforcement masonry structure according to claim 1, characterized in that: A circular hole is opened in the middle of the fixed steel plate, and a fixing bolt penetrates the fixed steel plate. The testing machine and the reaction frame are connected into a whole by clamping the fixing bolt with the jaws of the testing machine.

6. A lateral pressure reaction frame suitable for eccentric pull-out test of caulking reinforcement masonry structure according to claim 1, characterized in that: The square steel tube support and the square steel tube reaction beam are provided with circular holes at the top and the bottom, one end of which is penetrated by a long screw rod and the other end is penetrated by a short screw rod, and are fixed at a required height by nuts.

7. A lateral pressure reaction frame suitable for eccentric pull-out test of caulking reinforcement masonry structure according to claim 1, characterized in that: The jack is connected to the jack base plate by welding to form a jack assembly. The jack assembly penetrates the jack base plate and the square steel pipe support by jack fixing bolts and is fixed as a whole by jack fixing nuts and the square steel pipe support.

8. A lateral pressure reaction frame suitable for eccentric pull-out test of caulking reinforcement masonry structure according to claim 1, characterized in that: The porous box-type pad is placed on the left side of the jack to reduce the deadweight of the pad and alleviate the stress concentration caused by the lateral pressure.

9. A lateral pressure reaction frame suitable for eccentric pull-out test of caulking reinforcement masonry structure according to claim 1, characterized in that: The I-shaped reaction beam is placed on the right side of the square steel tube reaction beam to ensure that the lateral pressure is transmitted to the left side of the specimen.

10. A lateral pressure reaction frame suitable for eccentric pull-out test of caulking reinforcement masonry structure according to claim 1, characterized in that: The height position of the jack can be adjusted by adjusting the nut of the square steel pipe support to match the lateral pressure of specimens of different sizes.

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