Wall foot component with self-resetting energy dissipation function, fabricated shear wall and construction method

Abstract

The invention relates to the technical field of assembly type shear walls, in particular to a wall foot component with a self-resetting energy dissipation function, an assembly type shear wall and a construction method.The wall foot component comprises an upper connecting piece, a middle connecting piece, a lower connecting piece and a foamed aluminum block, and the upper connecting piece is connected with the middle connecting piece through an energy dissipation steel bar; the middle connecting piece is connected with the lower connecting piece through a shape memory alloy bar, a first limiting hole is formed in the middle of the lower connecting piece, the foamed aluminum block is arranged in the first limiting hole, the bottom of the foamed aluminum block abuts against the bottom of the lower connecting piece, and the top of the foamed aluminum block penetrates through the first limiting hole and abuts against the lower side of the middle connecting piece. The wall foot component has the energy dissipation capacity and the self-resetting capacity, and the use function of the shear wall can be quickly recovered after an earthquake.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of assembled shear wall, in particular to a wall foot component with self-resetting and energy dissipation, an assembled shear wall and a construction method. BACKGROUND

[0002] The assembled reinforced concrete shear wall has the characteristics of standardized production, energy saving and environmental protection, and short construction period, which meets the development requirements of the building industry. However, the existing earthquake damage experience shows that the wall foot part of the shear wall is severely damaged in the earthquake, which leads to the interruption of the use function of the structure, and it is difficult to repair or the repair cost is high after the earthquake.

[0003] The recoverable function structure with replaceable components is a new type of structure developed in recent years, and its core design concept is that under the action of earthquake, the replaceable components arranged in the structure absorb and dissipate the seismic energy, and the structural damage is concentrated in the components themselves, so as to protect the main structure from serious damage; after the earthquake, only the damaged replaceable components need to be replaced, so as to restore the use function of the structure and avoid the high cost problem of the traditional structure which needs to be completely demolished and reconstructed after the earthquake.

[0004] In the current research and application, the replaceable components mostly adopt energy dissipation type structure (such as metal damper, friction damper), which will produce significant residual deformation when dissipating seismic energy, leading to the difficulty in replacing the components after the earthquake, and further affecting the recovery of the use function of the structure after the earthquake. SUMMARY

[0005] The purpose of the present application is to provide a wall foot component with self-resetting and energy dissipation, an assembled shear wall and a construction method, which has energy dissipation ability and self-resetting ability, and helps to realize the rapid recovery of the use function of the shear wall after the earthquake.

[0006] In order to achieve the above purpose, the present application provides a wall foot component with self-resetting and energy dissipation, which comprises an upper connecting piece, a middle connecting piece, a lower connecting piece and a foam aluminum block, the upper connecting piece is connected with the middle connecting piece through an energy dissipation steel rod, the energy dissipation steel rod comprises an anchoring segment one and an energy dissipation segment, the anchoring segment one is arranged at both ends of the energy dissipation segment, the anchoring segment one is a cylindrical structure with threads, and the energy dissipation segment is a sandglass-shaped structure; the middle connecting piece is connected with the lower connecting piece through a shape memory alloy rod, the shape memory alloy rod is dumbbell-shaped and comprises an anchoring segment two and a deformation segment, the anchoring segment two is arranged at both ends of the deformation segment, and threads on the anchoring segment two are connected with nuts; a limiting hole one is arranged in the middle of the lower connecting piece, the foam aluminum block is arranged in the limiting hole one, the bottom of the foam aluminum block abuts against the bottom of the lower connecting piece, and the top of the foam aluminum block abuts against the lower side of the middle connecting piece through the limiting hole one.

[0007] Preferably, the upper connecting piece is T-shaped structure, comprising a top transversely arranged flange plate one and a web plate one vertically connected to the lower side of the flange plate one, a plurality of connecting holes one are arranged on the flange plate one, the plurality of connecting holes one are uniformly distributed on both sides of the web plate one, a plurality of limiting holes two are arranged on the web plate one, and the middle part of the energy dissipation steel rod is arranged in the limiting hole two.

[0008] Preferably, the middle connecting piece is U-shaped structure, comprising a bottom transversely arranged flange plate two and a web plate two vertically connected to the upper side of the flange plate two, a limiting groove is arranged in the middle part of the flange plate two, connecting holes two connected with the shape memory alloy rod are arranged on both sides of the limiting groove, the web plate one is connected to the middle part of the U-shaped structure and abuts against the limiting groove, limiting holes three corresponding to the limiting holes two are arranged on the web plate two, and both ends of the energy dissipation steel rod are arranged through the limiting holes three and connected with the nut.

[0009] Preferably, the lower connecting piece comprises flange plates three and four, the flange plates three and four are arranged in parallel, a limiting hole one is arranged in the middle part of the flange plate three, connecting holes three connected with the shape memory alloy rod are arranged on both sides of the limiting hole one, a plurality of stiffening plates are arranged between the flange plates three and four, a plurality of connecting holes four are arranged on the flange plate four, and the connecting holes four are arranged alternately with the stiffening plates.

[0010] Further preferably, the energy dissipation steel rod is made of low yield point soft steel, the minimum cross-sectional diameter of the energy dissipation section is 0.5 times the diameter of the anchoring section, and the length of the energy dissipation section is less than or equal to 5 times the minimum cross-sectional diameter, so as to ensure that the energy dissipation steel rod has good hysteresis energy dissipation capacity and fatigue resistance.

[0011] Further preferably, the shape memory alloy can exert a tensile force on the shape memory alloy rod by exerting a torque on the nut, thereby providing self-resetting capability for the wall foot component.

[0012] Further preferably, the length of the deformation section is less than or equal to 2 times the thickness of the shear wall body.

[0013] Further preferably, the foam aluminum block is a block made of aluminum or aluminum alloy as a base material and containing a large number of interconnected or closed pores, which has the characteristics of light weight, high specific strength, high specific stiffness, high damping and shock absorption performance, etc.; the top and bottom of the foam aluminum block are in contact with the middle connecting piece and the lower connecting piece respectively, for providing the compression bearing capacity of the wall foot component.

[0014] The assembled shear wall comprises the wall foot component with self-resetting energy dissipation, the bottom pressure bearing module, the prefabricated wall plate, the steel connector, the post-cast floor slab and the foundation, the wall foot component and the bottom pressure bearing module are located at the bottom of the assembled shear wall, the wall foot component is arranged on both sides of the bottom pressure bearing module, the bottom of the wall foot component and the bottom pressure bearing module is fixedly connected with the top of the foundation, the bottom end of the bottom prefabricated wall plate is fixedly connected with the top of the wall foot component and the bottom pressure bearing module, the top of the bottom prefabricated wall plate is fixedly connected with the remaining prefabricated wall plates through bolts and the steel connector, and the post-cast floor slab is located at the connection position of the prefabricated wall plates and is integrally poured with the steel connector.

[0015] Preferably, the bottom pressure bearing module comprises a box body, an end plate, an outer steel plate, a pair of steel bars and concrete, the end plate is provided with an oval connecting hole five connected with a bolt, the box body is of an open structure, the top of the box body is located on one side of the connecting hole five and is fixedly connected with the bottom of the end plate, the side of the box body is connected with the outer steel plate, the outer steel plate is arranged on the circumferential side of the box body, the bottom of the outer steel plate is fixedly connected with the end plate, a plurality of uniformly distributed pair of steel bars are arranged in the outer steel plate, and the inner cavity of the outer steel plate is poured with concrete.

[0016] Preferably, the prefabricated wall plate comprises longitudinal steel bars, stirrups, bolt sleeves and concrete, the longitudinal steel bars and the stirrups are connected with each other perpendicularly, the concrete is poured on the outer sides of the longitudinal steel bars and the stirrups, the longitudinal steel bars comprise edge member longitudinal steel bars, web longitudinal steel bars and force transmission longitudinal steel bars, both ends of the edge member longitudinal steel bars are provided with bolt sleeves connected through threads, and the outer side end of the force transmission longitudinal steel bar is connected with a bolt sleeve through threads.

[0017] More preferably, the steel connector is of a rectangular steel pipe structure, both upper and lower ends of the steel connector in contact with the prefabricated wall plate are provided with bolt holes, and the steel connector and the prefabricated wall plate are connected through the bolt holes. The steel connector is generally arranged at the floor slab height of the shear wall structure, and the height of the steel connector is consistent with the thickness of the floor slab.

[0018] More preferably, the post-cast floor slab comprises longitudinal steel bars, stirrups and concrete, the longitudinal steel bars and the stirrups are connected with each other perpendicularly, and the concrete is poured on the outer sides of the longitudinal steel bars and the stirrups. The post-cast floor slab can adopt a construction form of a prefabricated bottom plate + a post-cast concrete layer or a whole floor slab pouring, wherein the longitudinal steel bars of the post-cast floor slab can penetrate through the inner cavity of the steel connector during construction, thereby enhancing the integrity of the floor slab and the wall plate.

[0019] Preferably, the foundation also comprises longitudinal steel bars, stirrups and concrete, the longitudinal steel bars are connected with the stirrups perpendicularly, and the concrete is poured outside the longitudinal steel bars and the stirrups. In the area connected with the wall foot part with self-resetting and energy-dissipating function, the foundation should also be pre-buried with force transmission steel bars with bolt sleeves at the ends to ensure reliable connection between the wall foot part with self-resetting and energy-dissipating function and the foundation; for the area in contact with the bottom pressure-bearing module, a 20mm deep channel should be provided for the base seat grouting in the installation of the bottom pressure-bearing module.

[0020] The construction method of the prefabricated shear wall comprises the following steps, S1, processing of the wall foot part with self-resetting and energy-dissipating function, the bottom pressure-bearing module, the prefabricated wall panel, the steel connector and various embedded parts in the factory; S2, arranging the longitudinal steel bars and bolt sleeves in the embedded parts in the foundation formwork, wherein the longitudinal steel bars with bolt sleeves are welded with the foundation steel bar cage, and then pouring the required concrete for the foundation and curing to complete the foundation construction; S3, installing the wall foot part with self-resetting and energy-dissipating function in the specified area on the top surface of the foundation, and fixing it with the foundation through the bolts passing through the four connecting holes of the flange plate four of the lower connector; placing the bottom pressure-bearing module in the specified area on the top surface of the foundation, and performing seat grouting between the bottom pressure-bearing module and the foundation; after the seat grouting reaches the design strength, hoisting the bottom prefabricated wall panel above the wall foot part with self-resetting and energy-dissipating function and the bottom pressure-bearing module, and fixing it with the wall foot part through the bolts passing through the corresponding connecting structure of the prefabricated wall panel and the flange plate one connecting hole one of the wall foot part and the end plate connecting hole five of the bottom pressure-bearing module, to complete the installation of the bottom layer of the prefabricated shear wall; S4, placing the steel connector on the top of the bottom prefabricated wall panel, and fixing it with the bottom prefabricated wall panel through the bolts passing through the corresponding hole positions of the steel connector and the bolt sleeves; then hoisting the upper prefabricated wall panel above the steel connector, and connecting it with the steel connector through the bolts passing through the corresponding structure of the upper prefabricated wall panel, repeating the step to complete the installation of each layer of prefabricated wall panel in turn; S5, arranging the longitudinal steel bars and stirrups required for the post-poured floor slab between each layer of prefabricated wall panel, wherein the longitudinal steel bars of the post-poured floor slab pass through the inner cavity of the steel connector, after completing the binding of the floor slab steel bars, pouring the floor slab concrete, and after the concrete hardens to the design strength, completing the production of the post-poured floor slab, and completing the overall construction of the prefabricated shear wall.

[0021] Preferably, the assembling process of the wall foot component with self-resetting energy dissipation in S1 is as follows: firstly, the foam aluminum block is placed in the limiting hole one of the lower connecting piece, and then the middle connecting piece is placed on the top of the foam aluminum block, so that the top of the foam aluminum block abuts against the lower side of the middle connecting piece, and then the shape memory alloy rod is passed through the connecting hole two of the middle connecting piece and the connecting hole three of the lower connecting piece, and the connection between the middle connecting piece and the lower connecting piece is realized by fastening with the nut, and the shape memory alloy rod is pre-tensioned by applying rated torque to the nut; then the web one of the upper connecting piece is placed in the limiting groove of the middle connecting piece and abuts against, and the energy dissipation steel rod is passed through the limiting hole two of the upper connecting piece and the limiting hole three of the middle connecting piece, and the end of the energy dissipation steel rod is fixed and limited by the nut.

[0022] The application adopts the wall foot component with self-resetting energy dissipation, the fabricated shear wall and the construction method, and has the following beneficial effects: (1) The application has good seismic performance. The wall foot components with self-resetting energy dissipation are arranged at both sides of the bottom of the shear wall structure, which not only has stable load capacity, but also has good energy dissipation capacity. In the case of compression, the foam aluminum block bears the pressure. The foam aluminum block is not only light and high-strength, but also maintains the pressure bearing capacity unchanged after reaching the peak pressure bearing capacity, only generates compression deformation, ensures that the component has stable output when under compression, and avoids the collapse of the shear wall due to the loss of the compression bearing capacity of the component. In the case of tension, the energy dissipation steel rod and the shape memory alloy rod bear the tension together, which not only provides sufficient tensile bearing capacity for the component, but also has a certain redundancy, so that even if individual energy dissipation steel rod or shape memory alloy rod loses the load capacity and exits the work under large deformation, the remaining part can still work stably to ensure the output of the component. On the other hand, the materials used in the wall foot component, such as foam aluminum, low yield point soft steel and shape memory alloy, have good energy absorption rate, which can effectively absorb and dissipate the seismic capacity input to the shear wall structure during the earthquake, and protect the safety of the structure. In addition, the bottom pressure bearing module at the bottom of the shear wall structure is connected with the foundation only by the seat mortar, and the bottom pressure bearing module can be separated from the foundation when the shear wall produces large lateral displacement, so that the module will not be bent and damaged during the earthquake. On the other hand, the bottom pressure bearing module adopts the outer steel plate and the opposite pulling steel bar mode, and the module has high compression bearing capacity and is not easy to be crushed.

[0023] (2) The application has good anti-seismic toughness. When the shear wall is subjected to earthquake action, the damage and plastic deformation of the structure are mainly concentrated in the wall foot part with self-resetting and energy dissipation, and the remaining part is basically intact, so that the use function of the shear wall structure can be restored after the earthquake by only replacing the damaged wall foot part with self-resetting and energy dissipation. For the wall foot part with self-resetting and energy dissipation, the plastic deformation of the part is mainly caused by the energy dissipation steel rod, and the pre-tensioned shape memory alloy rod arranged around the part can effectively reduce the residual deformation of the part, and realize the self-resetting of the part after the earthquake. The self-resetting of the wall foot part is beneficial to the recovery of the shear wall to the original position after the earthquake, and thus the replacement of the replaceable wall foot part after the earthquake is easy to realize. In addition, the connection mode of the wall foot part with the upper wall body and the foundation is bolt connection, and the replacement process of the part is simple, fast and labor-saving, so that the use function of the shear wall can be quickly restored after the earthquake.

[0024] (3) The application supports the modular production and assembly type construction of the structure. The main components of the shear wall (except the foundation and the post-cast floor) can be pre-fabricated in the factory, so as to ensure the precision and quality of the component processing; the outer dimensions of each component are regular, which is easy to be modularly manufactured and can be applied to various shear wall structures with different plane arrangement requirements. In addition, the pre-fabricated components can be quickly assembled into the shear wall structure through bolt connection after being transported to the site, which is not only simple to operate but also controllable in connection quality, effectively ensuring the safety of the structure, and significantly saving the labor input and construction period, greatly improving the construction efficiency, and having a broad popularization prospect.

[0025] The technical solutions of the application will be further described in detail below with reference to the drawings and examples. DRAWINGS

[0026] Figure 1 is a perspective view of the wall foot part with self-resetting and energy dissipation of the embodiment 1 of the application; Figure 2 is a side view of the wall foot part with self-resetting and energy dissipation of the embodiment 1 of the application; Figure 3 is an exploded view of the wall foot part with self-resetting and energy dissipation of the embodiment 1 of the application; Figure 4 is a side view of the energy dissipation steel rod of the embodiment 1 of the application; Figure 5 is a side view of the shape memory alloy rod of the embodiment 1 of the application; Figure 6 is a perspective view of the assembly type shear wall of the embodiment 2 of the application; Figure 7 is an exploded view of the assembly type shear wall of the embodiment 2 of the application; Figure 8 is a schematic view of the bottom pressure bearing module of the embodiment 2 of the application; Figure 9is a schematic diagram of the prefabricated wallboard of embodiment 2 of the present application; Figure 10 is a schematic diagram of the internal structure of the prefabricated wallboard of embodiment 2 of the present application; Figure 11 is a schematic diagram of the steel connector of embodiment 2 of the present application.

[0027] Reference signs: 1, upper connecting piece; 11, flange plate one; 111, connecting hole one; 12, web plate one; 121, limiting hole two; 2, middle connecting piece; 21, flange plate two; 211, connecting hole two; 22, web plate two; 221, limiting hole three; 23, limiting groove; 3, lower connecting piece; 31, limiting hole one; 32, flange plate three; 321, connecting hole three; 33, flange plate four; 331, connecting hole four; 34, stiffening plate; 4, foam aluminum block; 5, energy dissipation steel bar; 51, anchoring section one; 52, energy dissipation section; 6, shape memory alloy bar; 61, anchoring section two; 62, deformation section; 7, wall foot component; 8, bottom pressure bearing module; 81, box body; 82, end plate; 821, connecting hole five; 83, outer steel plate; 84, tensioning steel bar; 9, prefabricated wallboard; 91, longitudinal steel bar; 911, edge component longitudinal bar; 912, web plate longitudinal bar; 913, force transmission longitudinal bar; 92, stirrup; 93, bolt sleeve; 94, concrete; 10, steel connector; 101, bolt hole; 110, post-cast floor slab; 120, foundation. DETAILED DESCRIPTION

[0028] The present application is further described below in conjunction with the accompanying drawings and embodiments. Unless otherwise defined, technical or scientific terms used in the present application should be understood as having the commonly understood meaning as understood by one of ordinary skill in the art to which the present application belongs. The features mentioned above or the features mentioned in the specific examples mentioned by the present application can be combined arbitrarily, and these specific embodiments are only used to illustrate the present application and not to limit the scope of the present application.

[0029] Embodiment 1 As shown in the drawings, Figures 1 to 5 The present application provides a wall foot component 7 with self-resetting energy dissipation, which comprises an upper connecting piece 1, a middle connecting piece 2, a lower connecting piece 3 and a foam aluminum block 4, the upper connecting piece 1 is connected with the middle connecting piece 2 through an energy dissipation steel bar 5, the middle connecting piece 2 is connected with the lower connecting piece 3 through a shape memory alloy bar 6, a limiting hole one 31 is arranged in the middle of the lower connecting piece 3, the foam aluminum block 4 is arranged in the limiting hole one 31, the bottom of the foam aluminum block 4 abuts against the bottom of the lower connecting piece 3, and the top of the foam aluminum block 4 abuts against the lower side of the middle connecting piece 2 through the limiting hole one 31.

[0030] The upper connecting piece 1 is T-shaped structure, including the flange plate one 11 arranged horizontally at the top and the web one 12 connected vertically at the lower side of the flange plate one 11. The flange plate one 11 is provided with a plurality of connecting holes one 111, which are uniformly distributed on both sides of the web one 12, for reliable connection with the prefabricated wallboard 9 through high-strength bolts. The web one 12 is provided with a plurality of limiting holes two 121, the middle part of the energy dissipation steel bar 5 is arranged in the limiting holes two 121, to realize the limiting and force transmission of the energy dissipation steel bar 5.

[0031] The middle connecting piece 2 is U-shaped structure, including the flange plate two 21 arranged horizontally at the bottom and the web two 22 connected vertically at the upper side of the flange plate two 21. The middle part of the flange plate two 21 is provided with a limiting groove 23, the size of the limiting groove 23 is matched with the size of the web one 12 of the upper connecting piece 1, the web one 12 is connected at the middle part of the U-shaped structure and abuts with the limiting groove 23. The two sides of the limiting groove 23 are provided with connecting holes two 211 connected with the shape memory alloy bar 6, for the installation and fixation of the shape memory alloy bar 6. The web two 22 is provided with limiting holes three 221 corresponding to the limiting holes two 121, the two ends of the energy dissipation steel bar 5 are penetrated through the limiting holes three 221 and connected with the nut, to realize the axial limiting of the energy dissipation steel bar 5 and prevent its sliding.

[0032] The lower connecting piece 3 includes the flange plate three 32 and the flange plate four 33, which are arranged in parallel at the top and bottom. The middle part of the flange plate three 32 is provided with a limiting hole one 31, the size of the limiting hole one 31 is consistent with the planar size of the foam aluminum block 4, for limiting the foam aluminum block 4 and preventing its lateral deviation. The two sides of the limiting hole one 31 are provided with connecting holes three 321 connected with the shape memory alloy bar 6, cooperating with the nut to realize the fixation of the lower end of the shape memory alloy bar 6. A plurality of stiffening plates 34 are arranged between the flange plate three 32 and the flange plate four 33, which are uniformly distributed, for enhancing the integrity and anti-deformation ability of the lower connecting piece 3. The flange plate four 33 is provided with a plurality of connecting holes four 331, which are arranged alternately with the stiffening plates 34, for connecting with the foundation 120 through high-strength bolts, to ensure the reliable fixation of the wall foot component 7 and the foundation 120.

[0033] The energy dissipation steel rod 5 is made of low yield point soft steel, which has good plastic deformation capacity and can absorb and dissipate seismic energy through continuous shear plastic deformation. The energy dissipation steel rod 5 includes an anchoring segment one 51 and an energy dissipation segment 52, and the anchoring segment one 51 is arranged at both ends of the energy dissipation segment 52. The anchoring segment one 51 is a threaded cylindrical structure, which is convenient for cooperation with a nut to realize fixation. The energy dissipation segment 52 is a sandglass-shaped structure, the minimum cross-sectional diameter of the energy dissipation segment 52 is 0.5 times the diameter of the anchoring segment, and the length of the energy dissipation segment 52 is less than or equal to 5 times the minimum cross-sectional diameter, so as to ensure that the energy dissipation steel rod 5 has good hysteresis energy dissipation capacity and fatigue resistance, and avoid premature failure under the action of an earthquake.

[0034] The shape memory alloy rod 6 is dumbbell-shaped and includes an anchoring segment two 61 and a deformation segment 62, and the anchoring segment two 61 is arranged at both ends of the deformation segment 62. The anchoring segment two 61 is provided with threads connected with a nut, and the shape memory alloy rod 6 is fixed through the nut and the middle connecting piece 2 and the lower connecting piece 3. By applying torque to the nut, a tensile force can be applied to the shape memory alloy rod 6, thereby providing the wall foot component 7 with self-resetting capability. The length of the deformation segment 62 is less than or equal to 2 times the thickness of the shear wall body. The length can ensure that the shape memory alloy rod 6 has enough deformation space under the action of an earthquake, and at the same time avoid the stability problem caused by being too long.

[0035] The aluminum foam block 4 is a block made of aluminum or aluminum alloy as a matrix and containing a large number of interconnected or closed pores, which has the characteristics of light weight, high specific strength, high specific stiffness, high damping and shock absorption performance, etc. The top and bottom of the aluminum foam block 4 are in contact with the middle connecting piece 2 and the lower connecting piece 3 respectively, which is mainly used to provide the compressive bearing capacity of the wall foot component 7 to meet the bearing requirements of the shear wall foot under the action of self weight and earthquake compression.

[0036] Self-resetting and energy dissipation mechanism of the wall foot component 7 with self-resetting and energy dissipation: The wall foot component 7 with self-resetting and energy dissipation is connected with the prefabricated wall panel 9 and the foundation 120 through high-strength bolts. Considering that the shear wall foot part is approximately subjected to axial force when subjected to the action of an earthquake, and the demand for compressive bearing capacity is much higher than that for tensile bearing capacity, the wall foot component 7 with self-resetting and energy dissipation is designed as an axial force component with asymmetric tension and compression.

[0037] When the wall foot component 7 with self-resetting energy dissipation is subjected to tension, the upper connecting piece 1 (T-shaped steel member) is subjected to tension and is lifted, and the web plate one 12 drives the middle connecting piece 2 (U-shaped steel member) to be synchronously lifted through the hinged energy dissipation steel rod 5, and in this process, the upper connecting piece 1 and the middle connecting piece 2 both remain elastic deformation and have no plastic damage. After the middle connecting piece 2 is lifted, the bottom thereof is out of contact with the top surface of the foam aluminum block 4, and the foam aluminum block 4 exits the tension force system. The energy dissipation section 52 of the energy dissipation steel rod 5 is subjected to shear deformation under the action of tension, and the low-yield-point soft steel has good plastic deformation capacity, can absorb and dissipate the energy input by the earthquake through continuous shear plastic deformation, and the hourglass-shaped structure of the energy dissipation section 52 ensures that it has stable hysteretic energy dissipation capacity and fatigue resistance, and avoids premature fracture failure.

[0038] At the same time, the shape memory alloy rod 6 is further elongated as the middle connecting piece 2 is lifted, the two ends thereof are fastened to the middle connecting piece 2 and the lower connecting piece 3 through high-strength nuts, and in the component assembly stage, the nuts are subjected to rated torque to achieve pre-tensioning. The shape memory alloy has super-elasticity characteristics that can restore the original shape after force deformation, and after being subjected to tension and elongation, a reset force to restore the original length is generated; at the same time, the pre-tensioning state makes the shape memory alloy rod 6 always maintain a certain tensioning force, which can offset part of the residual deformation generated by the energy dissipation steel rod 5, push the upper connecting piece 1 and the middle connecting piece 2 to return to the initial position, and realize self-resetting of the component.

[0039] When the wall foot component 7 with self-resetting energy dissipation is subjected to compression, the upper connecting piece 1 is subjected to pressure and is pressed down, the bottom surface of the web plate one 12 is in close contact with the flange plate two 21 of the middle connecting piece 2, the middle connecting piece 2 is synchronously pressed down, the bottom of the middle connecting piece 2 is in close contact with the top surface of the foam aluminum block 4 again, and the foam aluminum block 4 enters the compression force system.

[0040] The foam aluminum block 4 has the characteristics of light weight, high specific strength and stable compression bearing capacity, and when subjected to compression, the block generates compression deformation, the internal pores are gradually compacted, but after reaching the peak compression capacity, the compression capacity can be maintained unchanged for a long time, avoiding the sudden drop of the compression bearing capacity to cause the shear wall to collapse, meeting the demand of the wall foot component 7 for high compression bearing capacity, and at the same time, the material voids are gradually compacted to dissipate the energy input by the earthquake and the structure, which is beneficial to the structure seismic resistance.

[0041] And, in the process of pressure, the energy dissipation steel bar 5 has no additional deformation (because the upper connecting piece 1 and the middle connecting piece 2 transmit pressure through direct contact, no shear force is generated to the energy dissipation steel bar 5), and no new residual deformation is generated. The shape memory alloy bar 6 gradually recovers to the original length before the pre-tension is applied with the middle connecting piece 2 being pressed down, the tension force disappears and exits the stress state, without the need for additional reset force, ensuring that the larger vertical load transmitted from the upper wall to the component in the pressure state is borne by the aluminum foam block, avoiding damage to the shape memory alloy bar 6 under pressure, and the seismic energy is also dissipated by the aluminum foam block when under pressure.

[0042] Example 2 As shown in Figures 6 to 11 The present application provides an assembled shear wall, which comprises the wall foot component 7 with self-resetting energy dissipation, the bottom pressure-bearing module 8, the prefabricated wall panel 9, the steel connector 10, the post-cast floor slab 110 and the foundation 120. The wall foot component 7 and the bottom pressure-bearing module 8 are located at the bottom of the assembled shear wall, and the wall foot component 7 is arranged on both sides of the bottom pressure-bearing module 8, forming a symmetrical force structure. The wall foot component 7 is fixedly connected with the top of the foundation 120 through high-strength bolts passing through the connecting hole four 331 of the flange plate four 33 of the lower connecting piece 3, and the bottom pressure-bearing module 8 is fixedly connected with the top of the foundation 120 through the seat grout. The bottom end of the bottom prefabricated wall panel 9 is fixedly connected with the flange plate one 11 connecting hole one 111 of the wall foot component 7 and the end plate 82 connecting hole five 821 of the bottom pressure-bearing module 8 through high-strength bolts passing through the corresponding connecting structure of the bottom prefabricated wall panel 9. The top of the bottom prefabricated wall panel 9 is fixedly connected with the remaining prefabricated wall panels 9 through bolts and steel connectors 10, forming reliable force transmission between the upper and lower wall panels; the post-cast floor slab 110 is located at the connecting position of the prefabricated wall panels 9 and is integrally cast with the steel connector 10, thereby enhancing the integrity of the shear wall and the floor slab.

[0043] The bottom pressure-bearing module 8 comprises a box body 81, an end plate 82, an outer steel plate 83, a tensioning steel bar 84 and concrete 94. The end plate 82 is provided with an oval connecting hole five 821 connected with a bolt. The box body 81 is an open structure. The top of the box body 81 is located on one side of the connecting hole five 821 and is fixedly connected with the bottom of the end plate 82. The side of the box body 81 is connected with the outer steel plate 83, thereby providing space for construction, later maintenance and inspection of high-strength bolts used for connecting the bottom pressure-bearing module 8 and the prefabricated wall panel 9.

[0044] The outer steel plate 83 is arranged on the side of the box body 81, the bottom of the outer steel plate 83 is fixedly connected with the end plate 82, a plurality of uniformly distributed opposite-pulling steel bars 84 are arranged in the outer steel plate 83, the opposite-pulling steel bars 84 are welded to the inner side of the outer steel plate 83, and the opposite-pulling steel bars 84 are used for improving the integrity of the outer steel plate 83 and preventing the outer steel plate 83 from being pressed and curved. The inner cavity of the outer steel plate 83 is poured with concrete 94, and the strength of the concrete 94 can be designed to be equal to or higher than the strength of the concrete 94 of the prefabricated wall plate 9, so that the high compression bearing capacity of the bottom compression module 8 is ensured.

[0045] The prefabricated wall plate 9 comprises longitudinal steel bars 91, stirrups 92, bolt sleeves 93 and concrete 94, the longitudinal steel bars 91 and the stirrups 92 are connected with each other perpendicularly to form a steel bar cage framework, the concrete 94 is poured outside the longitudinal steel bars 91 and the stirrups 92 to wrap the steel bar cage to form a wall plate main body. The longitudinal steel bars 91 comprise edge member longitudinal steel bars 911, web longitudinal steel bars 912 and force transmission longitudinal steel bars 913, both ends of the edge member longitudinal steel bars 911 are provided with bolt sleeves 93 connected through threads, and the outer side end of the force transmission longitudinal steel bars 913 is connected with the bolt sleeve 93 through threads, so that the force transmission path of the steel bar-bolt sleeve 93-high-strength bolt can be realized through high-strength bolts, a bolt-connected dry connection system is formed, and problems such as long maintenance time and large on-site operation amount of a traditional wet connection are avoided.

[0046] The steel connector 10 is a rectangular steel pipe structure, and the rectangular steel pipe has good bending resistance and shearing resistance. The upper and lower ends of the steel connector 10 in contact with the prefabricated wall plate 9 are provided with bolt holes 101, and the steel connector 10 is connected with the prefabricated wall plate 9 through bolts. The steel connector 10 is generally arranged at the floor height of the shear wall structure, the height of the steel connector 10 is consistent with the thickness of the floor, so that the steel connector 10 forms a whole with the floor and does not occupy additional building space.

[0047] The post-poured floor slab 110 comprises longitudinal steel bars 91, stirrups 92 and concrete 94, the longitudinal steel bars 91 and the stirrups 92 are connected with each other perpendicularly to form a floor slab steel bar framework, and the concrete 94 is poured outside the longitudinal steel bars 91 and the stirrups 92 to form a floor slab structure. The post-poured floor slab 110 can adopt a construction form of a prefabricated bottom plate + post-poured concrete layer or a whole-poured floor slab, so as to reduce the on-site formwork workload and improve the construction efficiency. During the construction of the longitudinal steel bars 91 of the post-poured floor slab 110, the inner cavity of the steel connector 10 can be penetrated, so as to enhance the integrity of the floor slab and the wall plate and improve the lateral displacement resistance of the structure.

[0048] The foundation 120 also includes longitudinal steel bars 91, stirrups 92, and concrete 94, the longitudinal steel bars 91 are connected with the stirrups 92 perpendicularly to form a foundation steel cage, and the concrete 94 is poured outside the longitudinal steel bars 91 and the stirrups 92 to form a foundation body. In the area connected with the self-centering and energy-dissipating wall foot component 7, the foundation 120 should also be pre-buried with a force transmission steel bar with a bolt sleeve 93 at the end, which is welded and fixed with the foundation 120 steel cage to ensure reliable connection between the self-centering and energy-dissipating wall foot component 7 and the foundation 120 and effective force transmission. For the area in contact with the bottom pressure-bearing module 8, a 20mm deep channel should be provided for the seat paste of the foundation 120 in the installation of the bottom pressure-bearing module 8, which can fill the gap between the foundation 120 and the module to ensure uniform stress on the contact surface.

[0049] Embodiment 3 A construction method of the fabricated shear wall described in Embodiment 2, comprising the following steps, S1, in the factory, complete the processing of the self-centering and energy-dissipating wall foot component 7, the bottom pressure-bearing module 8, the prefabricated wall panel 9, the steel connector 10, and various embedded parts.

[0050] The assembly and processing of the self-centering and energy-dissipating wall foot component 7 are as follows: first, place the aluminum foam block 4 in the limiting hole one 31 of the lower connecting piece 3, then place the middle connecting piece 2 on the top of the aluminum foam block 4, so that the top of the aluminum foam block 4 abuts against the lower side of the middle connecting piece 2, then pass the shape memory alloy rod 6 through the connecting hole two 211 of the middle connecting piece 2 and the connecting hole three 321 of the lower connecting piece 3, and fasten with nuts to realize the connection of the middle connecting piece 2 and the lower connecting piece 3, and at the same time, apply the rated torque to the nuts to pre-tension the shape memory alloy rod 6. Then place the web one 12 of the upper connecting piece 1 in the limiting groove 23 of the middle connecting piece 2 and abut it, pass the energy-dissipating steel rod 5 through the limiting hole two 121 of the upper connecting piece 1 and the limiting hole three 221 of the middle connecting piece 2, and fix the end of the energy-dissipating steel rod 5 by nuts.

[0051] S2, according to the requirements, arrange the longitudinal steel bars 91 and the bolt sleeves 93 in the embedded parts in the foundation template, wherein the longitudinal steel bars 91 with bolt sleeves 93 are welded with the foundation steel cage, then pour the required concrete 94 for the foundation 120 and perform maintenance to complete the construction of the foundation 120.

[0052] S3, install the wall foot part 7 with self-resetting energy dissipation on the top surface of the foundation 120 in a designated area, and fix it to the foundation 120 by passing the bolts through the connecting holes four 331 of the flange plate four 33 of the lower connecting piece 3; place the bottom pressure-bearing module 8 on the top surface of the foundation 120, and perform seat grouting between the bottom pressure-bearing module 8 and the foundation 120; after the seat grouting reaches the design strength, hoist the bottom prefabricated wall panel 9 above the wall foot part 7 with self-resetting energy dissipation and the bottom pressure-bearing module 8, and fix it by passing the bolts through the corresponding connecting structure of the prefabricated wall panel 9 and the connecting holes one 111 of the flange plate one 11 of the wall foot part 7 and the connecting holes five 821 of the end plate 82 of the bottom pressure-bearing module 8, to complete the installation of the bottom layer of the assembly shear wall.

[0053] S4, place the steel connector 10 on the top of the bottom prefabricated wall panel 9, and fix it by passing the bolts through the corresponding holes of the steel connector 10 and the bolt sleeve 93 of the bottom prefabricated wall panel 9; then hoist the upper prefabricated wall panel 9 above the steel connector 10, and connect it by passing the bolts through the corresponding structure of the upper prefabricated wall panel 9 and the steel connector 10, repeat the step, and sequentially complete the installation of each layer of prefabricated wall panel 9.

[0054] S5, arrange the longitudinal reinforcement 91 and stirrup 92 required by the post-cast floor slab 110 between each layer of prefabricated wall panel 9, wherein the longitudinal reinforcement 91 of the post-cast floor slab 110 penetrates the inner cavity of the steel connector 10, after completing the binding of the floor slab reinforcement, pour the floor slab concrete 94, and complete the production of the post-cast floor slab 110 after the concrete 94 hardens to the design strength, and complete the overall construction of the assembly shear wall.

[0055] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application and not to limit them, although the present application has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present application can still be modified or replaced by equivalents, and these modifications or equivalent replacements cannot make the modified technical solutions deviate from the spirit and scope of the technical solutions of the present application.

Claims

1. A wall base component with self-resetting energy dissipation, characterized in that: The device includes an upper connector, a middle connector, a lower connector, and a foamed aluminum block. The upper connector is connected to the middle connector via an energy-dissipating steel rod. The energy-dissipating steel rod includes an anchoring section 1 and an energy-dissipating section. Anchoring section 1 is located at both ends of the energy-dissipating section and is a threaded cylindrical structure. The energy-dissipating section is an hourglass-shaped structure. The middle connector is connected to the lower connector via a shape memory alloy rod. The shape memory alloy rod is dumbbell-shaped and includes an anchoring section 2 and a deformable section. Anchoring section 2 is located at both ends of the deformable section and has threads for connecting to nuts. The lower connector has a limiting hole 1 in the middle. The foamed aluminum block is placed in the limiting hole 1. The bottom of the foamed aluminum block abuts against the bottom of the lower connector, and the top of the foamed aluminum block passes through the limiting hole 1 and abuts against the lower side of the middle connector.

2. A wall base component with self-resetting energy dissipation according to claim 1, characterized in that: The upper connector is a T-shaped structure, including a flange plate 1 arranged horizontally at the top and a web plate 1 vertically connected to the lower side of the flange plate. The flange plate 1 has several connection holes 1, which are evenly distributed on both sides of the web plate 1. The web plate 1 has several limiting holes 2, and the middle part of the energy-consuming steel bar passes through the limiting holes 2.

3. A wall base component with self-resetting energy dissipation according to claim 2, characterized in that: The middle connector is a U-shaped structure, including a second flange plate arranged horizontally at the bottom and a second web plate vertically connected to the upper side of the second flange plate. The second flange plate has a limiting groove in the middle, and the two sides of the limiting groove have connecting holes two for connecting to shape memory alloy rods. The first web plate is connected to the middle of the U-shaped structure and abuts against the limiting groove. The second web plate has a third limiting hole corresponding to the second limiting hole. The two ends of the energy-consuming steel rod pass through the third limiting hole and are connected to nuts.

4. A wall base component with self-resetting energy dissipation according to claim 1, characterized in that: The lower connector includes flange plate three and flange plate four. Flange plate three and flange plate four are arranged parallel to each other vertically. A limiting hole one is provided in the middle of flange plate three. Connecting holes three are provided on both sides of the limiting hole one to connect with shape memory alloy rods. Multiple stiffening plates are provided between flange plate three and flange plate four. Several connecting holes four are provided on flange plate four. Connecting holes four and stiffening plates are arranged alternately.

5. A prefabricated shear wall, characterized in that: The structure includes a self-resetting energy-dissipating wall base component, a bottom pressure-bearing module, a precast wall panel, a steel connector, a post-cast floor slab, and a foundation as described in any one of claims 1-4. The wall base component and the bottom pressure-bearing module are both located at the bottom of the precast shear wall. The wall base component is set on both sides of the bottom pressure-bearing module. The bottom of the wall base component and the bottom pressure-bearing module are fixedly connected to the top of the foundation. The bottom end of the bottom precast wall panel is fixedly connected to the top of the wall base component and the bottom pressure-bearing module. The top of the bottom precast wall panel is fixedly connected to the remaining precast wall panels by bolts and steel connectors. The post-cast floor slab is located at the connection of the precast wall panels and is cast integrally with the steel connector.

6. A prefabricated shear wall according to claim 5, characterized in that: The bottom pressure-bearing module includes a box body, an end plate, an outer steel plate, tie bars, and concrete. The end plate has five elliptical connection holes for bolt connection. The box body has an open structure, with the top of the box body located on one side of the five connection holes and fixedly connected to the bottom of the end plate. The side of the box body is connected to the outer steel plate, which is wrapped around the perimeter of the box body. The bottom of the outer steel plate is fixedly connected to the end plate. Several evenly distributed tie bars are set inside the outer steel plate, and the inner cavity of the outer steel plate is filled with concrete.

7. A prefabricated shear wall according to claim 5, characterized in that: The precast wall panel includes longitudinal steel bars, stirrups, bolt sleeves and concrete. The longitudinal steel bars and stirrups are connected perpendicularly to each other. The concrete is poured on the outside of the longitudinal steel bars and stirrups. The longitudinal steel bars include edge member longitudinal bars, web longitudinal bars and force transmission longitudinal bars. Both ends of the edge member longitudinal bars are connected to the bolt sleeves by threads. The outer ends of the force transmission longitudinal bars are connected to the bolt sleeves by threads.

8. A construction method for a prefabricated shear wall as described in any one of claims 5-7, characterized in that: Includes the following steps: S1. Complete the processing of wall base components with self-resetting energy dissipation, bottom pressure-bearing modules, prefabricated wall panels, steel connectors and various embedded parts in the factory; S2. Arrange the longitudinal steel bars and bolt sleeves in the embedded parts in the foundation formwork. The longitudinal steel bars with bolt sleeves are welded to the foundation steel cage. Then pour the concrete required for the foundation and cure it to complete the foundation construction. S3. Install the wall base component with self-resetting energy dissipation in the designated area on the top surface of the foundation, and fix it to the foundation by passing bolts through the connection holes four of the lower connector flange plate four. Place the bottom pressure-bearing module in the designated area on the top surface of the foundation, and perform grouting between the bottom pressure-bearing module and the foundation; after the grouting reaches the design strength, hoist the bottom prefabricated wall panel above the wall foot component with self-resetting energy dissipation and the bottom pressure-bearing module, and fix it by passing bolts through the corresponding connection structure of the prefabricated wall panel and the flange plate of the wall foot component, and the end plate of the bottom pressure-bearing module, thus completing the installation of the bottom layer of the prefabricated shear wall; S4. Place the steel connector on top of the bottom precast wall panel and connect and fix it to the bolt sleeve of the bottom precast wall panel by passing bolts through the corresponding holes of the steel connector; then hoist the upper precast wall panel above the steel connector and connect it to the steel connector by passing bolts through the corresponding structure of the upper precast wall panel. Repeat this step to complete the installation of each layer of precast wall panels in sequence. S5. Arrange the longitudinal steel bars and stirrups required for the post-cast floor slab between the precast wall panels of each floor. The longitudinal steel bars of the post-cast floor slab pass through the inner cavity of the steel connector. After the floor slab steel bars are tied, pour the floor slab concrete. After the concrete hardens to the design strength, the post-cast floor slab is fabricated, and the overall construction of the prefabricated shear wall is completed.

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