Fabricated self-resetting concrete frame structure system with multistage response characteristic

Abstract

The invention relates to a fabricated self-resetting concrete frame structure system with a multi-stage response characteristic. The fabricated self-resetting concrete frame structure system is used for solving the technical problems that during large deformation, the force transmission path of vertical shearing force at the beam end is unreliable, the response characteristic is relatively single, robustness is poor, and the beam extension effect is caused by opening of the contact face between a beam and a column. Comprising five modules of column-column connection, column foot-foundation connection, beam-plate connection, beam-column connection and plate-plate connection, precast concrete beam-column components are connected through unbonded prestressed steel strands, and precast concrete plates are connected with the beams through connecting pieces. According to the self-resetting concrete frame, the self-resetting function and the assembling function are decoupled to a certain degree, the self-resetting capacity is provided only through the prestressed steel strands in the prefabricated columns and the gravity of the structure, and the risk that the steel strands are broken due to the beam extension effect of a traditional self-resetting concrete frame can be avoided; the energy consumption device can provide multi-stage energy consumption and limiting effects, and has the multi-stage response characteristic and high robustness.

Description

Technical Field

[0001] This invention relates to a prefabricated self-resetting concrete frame structure system with multi-level response characteristics. Background Technology

[0002] In the field of earthquake-prone engineering construction, although traditional concrete frame structures possess a certain load-bearing capacity, they are prone to irreversible residual deformation after an earthquake, leading to structural failure, high repair costs, and even secondary disasters. With the shift in seismic design philosophy from "strength-based seismic resistance" to "performance-based seismic resistance," self-resetting structural systems with extremely low residual displacement have become a research hotspot.

[0003] Currently, prestressed self-centering is a commonly used method in prefabricated self-centering concrete frames. This method connects precast beams and columns using unbonded prestressed steel strands, utilizing their elastic restoring force to achieve low residual deformation. For example... Figure 1 As shown, the beams and columns are connected by prestressed steel strands. The prestressed steel strands enable structural assembly and provide self-centering capability. During an earthquake, the swaying of the beam around its upper or lower end will increase the distance between the two columns, causing beam elongation. The reaction force from the two columns to the beam will also cause the formation of nodal compression zones on the columns in the support area, which will damage and destroy the columns. The beam elongation effect will also cause the prestressed steel strands to be tensile and deformed, thus losing their self-centering capability and posing a risk of breakage. Moreover, this prefabricated self-centering concrete frame structure system with multi-level response characteristics still has the problem of unreliable force transmission path of vertical shear force at the beam ends during large deformations. Summary of the Invention

[0004] The purpose of this invention is to provide a prefabricated self-resetting concrete frame structure system with multi-level response characteristics to solve the technical problems of unreliable force transmission path of vertical shear force at beam ends and beam elongation effect caused by the opening of the contact surface between beam and column during large deformation.

[0005] The technical solution of the present invention is as follows: a prefabricated self-resetting concrete frame structure system with multi-level response characteristics, comprising: Precast columns; Precast beams connect two adjacent precast columns; The column connector includes a column frame embedded in the precast column and a vertical shear force transfer plate fixed to one side of the column frame. The upper end face of the vertical shear force transfer plate is a first arc surface, and the vertical shear force transfer plate is provided with a first bolt hole. The beam connector includes a beam end frame embedded in the end of the precast beam and a force transmission plate fixed to the outer end of the beam end frame. The side of the force transmission plate near the precast column is inclined so that the distance between the force transmission plate and the precast column increases from top to bottom. The lower part of the force transmission plate is provided with a docking groove corresponding to the vertical shear force transmission plate. The top of the docking groove is provided with a second arc surface that corresponds to and fits with the first arc surface. The first and second arc surfaces are centered on the top of the force transmission plate. The side of the docking groove and the vertical shear force transmission plate have an movable gap to allow relative movement between the two. The force transmission plate is provided with a second bolt hole. The first friction plate has a third bolt hole corresponding to the second bolt hole. The first friction plate and the force transmission plate can be detachably connected by inserting bolts into the second and third bolt holes. The lower end has an inclined arc-shaped long hole with the top of the force transmission plate as the center. The second friction plate is provided with a fourth bolt hole, and a bolt is inserted into the fourth bolt hole and the arc-shaped elongated hole to achieve a detachable connection with the first friction plate.

[0006] The beneficial effects of this technical solution are as follows: In the use of a prefabricated self-resetting concrete frame structure system with multi-level response characteristics, the precast columns are vertically installed, and the precast beams are horizontally installed between adjacent precast columns. Column connectors are embedded in the precast columns via the column's internal frame, and beam connectors are embedded in the ends of the precast beams via the beam end frames. Furthermore, the beam connectors at both ends of the precast beams are symmetrically arranged. Due to the inclined surface of the force transmission plate, the top of the force transmission plate abuts against the column's internal frame on the precast column, and the inclined surface of the force transmission plate... The spacing between the precast columns, which is smaller at the top and larger at the bottom, provides space for the precast beam to rotate relative to the precast columns. During an earthquake, both ends of the precast beam rotate around the top of the force transmission plate. During the rotation, the remaining area of ​​the force transmission plate will not contact the precast columns, thus preventing the precast columns from being pushed open and causing beam elongation. This ensures that the spacing between the two precast columns remains unchanged, and the two precast columns will not exert a large reaction force on the precast beam. This ensures that the contact area between the precast columns and the precast beam will not be damaged by excessive compressive force. On the other hand, in order to ensure that seismic energy can be dissipated to minimize damage to precast beams and columns, energy-dissipating components are also installed between the precast columns and beams. These components include a first and a second arc surface that rubs against each other between the force transmission plate and the vertical shear force transmission plate. When the precast beam rotates around the top of the force transmission plate, the two arc surfaces centered on the rotation point also rub against each other to dissipate seismic energy. At the same time, the force transmission plate, the vertical shear force transmission plate, the first friction plate, and the second friction plate also constitute another set of friction energy dissipation components. The friction force converted from the pressure of the bolts pressing them together is used for the second stage of friction energy dissipation. Moreover, due to the arc-shaped elongated hole on the first friction plate, the first and second friction plates can also move relative to each other within a certain range when the precast beam rotates around the top of the force transmission plate, so as to achieve better friction energy dissipation function. At the same time, the arc-shaped elongated hole also limits the range of displacement between the first and second friction plates, preventing excessive displacement from causing structural damage. Furthermore, the vertical shear force transfer plate fixed relative to the precast columns and the force transfer plate fixed relative to the precast beams are vertically supported by a first and a second arc-shaped surface. This support is movable, meaning it can still provide effective support during large deformations, and the support area remains essentially unchanged. This solves the problem of unreliable vertical shear force exit paths at the beam ends during large deformations. Additionally, since the distance between the two precast columns remains essentially constant, the deformation of the prestressed steel strands threaded in the precast beams is relatively small. This avoids the problem of excessive deformation leading to failure or even breakage of the prestressed steel strands.

[0007] Based on the above scheme, the following improvements are made: there are two of each of the first and second friction plates, and they are arranged symmetrically about the force transmission plate.

[0008] Based on the above scheme, the following improvements are made: both the beam end frame and the column frame are provided with holes for threading prestressed steel strands.

[0009] Based on the above scheme, further improvements are made as follows: A parabolic, downward-convex threading channel is provided in the precast beam corresponding to the insertion holes, and prestressed steel strands are threaded through the channel. This parabolic arrangement allows for larger spans and better load-bearing capacity.

[0010] Based on the above scheme, the following improvements are made: the first friction plate is L-shaped.

[0011] Based on the above scheme, further improvements are made as follows, including: Basic platform; The basic connector includes a foundation embedded plate pre-embedded in the foundation platform and multiple connectors that can be detachably fixed to the foundation embedded plate. The upper part of the connector has a U-shaped connector frame, and the U-shaped connector frame has a horizontal and coaxial connecting arc hole. The column end connector includes a column end frame embedded in the lower end of the precast column and a column end connecting plate fixed on the side of the column end frame. The column end connecting plate is provided with a fifth bolt hole corresponding to the connecting arc hole. The column end connecting plate is connected to the U-shaped connecting frame by inserting bolts through the fifth bolt hole and the connecting arc hole.

[0012] The beneficial effects of this technical solution are as follows: The design of the foundation connectors and column end connectors between the precast column and the foundation platform, especially the design of the connecting arc holes, can cooperate with the energy dissipation structure between the beam and the column to achieve multi-level response characteristics. When the precast column swings relative to the foundation platform, the U-shaped connecting frame and the column end connecting plate rely on the friction force formed by the bolt compression to dissipate energy through mutual friction. In particular, the design of the connecting arc holes ensures that the two have a certain relative displacement, which can dissipate a part of the seismic energy through reciprocating friction. At the same time, another pair of U-shaped connecting frames and column end connecting plates set perpendicular to it can dissipate a part of the seismic energy through metal deformation.

[0013] Based on the above scheme, further improvements are made as follows: the column end frame is rectangular, with four column end connecting plates symmetrically arranged around the perimeter, and four connecting seats are correspondingly set on the foundation connecting parts. Attached Figure Description

[0014] Figure 1 This is a schematic diagram illustrating the principle of beam-column connection using prestressed steel strands in existing technology. Figure 2 This is a schematic diagram of a specific embodiment of a prefabricated self-resetting concrete frame structure system with multi-level response characteristics according to the present invention. Figure 3 This is a schematic diagram illustrating the connection principle between column connectors and beam connectors (the second friction plate is not shown). Figure 4 An exploded view of the connection between column connectors and beam connectors; Figure 5 A three-dimensional view of the beam connector; Figure 6 This is a three-dimensional view of the column connector; Figure 7 This is a 3D view of the connection between the base platform, base connectors, and column end connectors. Figure 8 for Figure 7 An explosion diagram; Figure 9 A 3D view of a group of precast columns, precast beams and foundation platform connected together; Figure 10 for Figure 9 The principle of multi-level response characteristics of the prefabricated self-resetting concrete frame structure system with corresponding multi-level response characteristics is demonstrated. Figure 11 This is an exploded view of the beam-slab and slab-slab connection structure. Figure 12 This is an exploded view of the column-to-column connection structure. In the diagram: 1-Precast column, 2-Precast beam, 3-Prestressed steel strand, 4-Foundation platform, 5-Precast slab, 6-Column connector, 61-Column frame, 611-Through hole, 62-Vertical shear force transfer plate, 621-First arc surface, 622-First bolt hole, 7-Beam connector, 71-Beam end frame, 72-Force transfer plate, 721-Inclined surface, 722-Spacing, 723-Butt groove, 724-Second arc surface, 725-Second bolt hole, 8-First friction plate, 81-Third bolt hole, 82-Arched elongated hole, 9-Second friction plate, 91- Fourth bolt hole, 10-Foundation connector, 101-Foundation embedded plate, 102-Connector seat, 1021-Connecting arc hole, 11-Column end connector, 111-Column end frame, 112-Column end connecting plate, 1121-Fifth bolt hole, 12-Bolt, 13-Column-column connection structure, 14-Beam-slab connection structure, 15-Slab-slab connection structure, 16-Unbonded prestressed steel strand, 17-Beam-slab connector, 18-Slab-slab connector, 19-Slab end connector, 20-Prestressed steel strand duct, 21-Column-column connector, 22-Screw hole, 23-Nut. Detailed Implementation

[0015] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only for explaining the invention and are not intended to limit the invention; that is, the described embodiments are merely some embodiments of the invention, and not all embodiments. The components of the embodiments of the invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0016] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0017] It should be noted that relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0018] The features and performance of the present invention will be further described in detail below with reference to embodiments.

[0019] A specific embodiment of the prefabricated self-resetting concrete frame structure system with multi-level response characteristics according to the present invention is as follows: Figure 2-9 As shown, the prefabricated self-resetting concrete frame structure system with multi-level response characteristics includes a foundation platform 4, precast columns 1, precast beams 2, column connectors 6, beam connectors 7, a first friction plate 8, a second friction plate 9, column end connectors 11, and foundation connectors 10.

[0020] like Figure 2 As shown, precast beam 2 connects two adjacent precast columns 1. Beam connectors 7 are installed at both ends of the precast beam 2, and column connectors 6 are installed on the precast columns 1 corresponding to the precast beam 2. Column end connectors 11 are installed at the bottom of the precast columns 1, and foundation connectors 10 are installed on the foundation platform 4 corresponding to the precast columns 1. The bottom end of the precast column 1 is connected to the foundation connector 10 of the foundation platform 4 via the column end connector 11. The precast columns 1 and precast beam 2 are connected by column connectors 6 and beam connectors 7, respectively.

[0021] The column connector 6 includes a column frame 61 embedded in the precast column 1 and a vertical shear force transfer plate 62 fixed to one side of the column frame 61. The upper end surface of the vertical shear force transfer plate 62 is a first arc surface 621, and the vertical shear force transfer plate 62 is provided with a first bolt hole 622.

[0022] The beam connector 7 includes a beam end frame 71 embedded in the end of the precast beam 2 and a force transmission plate 72 fixed to the outer end of the beam end frame 71. The side of the force transmission plate 72 near the precast column 1 is inclined 721 so that the distance 722 between the force transmission plate 72 and the precast column 1 increases from top to bottom. The lower part of the force transmission plate 72 is provided with a docking groove 723 corresponding to the vertical shear force transmission plate 62. The top of the docking groove 723 is provided with a second arc surface 724 that corresponds to and fits with the first arc surface 621. The first and second arc surfaces are centered on the top of the force transmission plate 72. The side of the docking groove 723 and the vertical shear force transmission plate 62 have a movable gap to allow relative movement between the two. The force transmission plate 72 is provided with a second bolt hole 725.

[0023] The first friction plate 8 has a third bolt hole 81 corresponding to the second bolt hole 725. Bolts are inserted into the second and third bolt holes 81 to achieve a detachable connection between the first friction plate 8 and the force transmission plate 72. The lower end has an inclined arc-shaped elongated hole 82 centered on the top of the force transmission plate 72. The second friction plate 9 has a fourth bolt hole 91. Bolts are inserted into the fourth bolt hole 91 and the arc-shaped elongated hole 82 to achieve a detachable connection with the first friction plate 8. There are two of each of the first and second friction plates 8 and they are symmetrically arranged about the force transmission plate 72. The first friction plate 8 is L-shaped.

[0024] In the prefabricated self-resetting concrete frame structure system with multi-level response characteristics, the precast columns 1 are vertically arranged, and the precast beams 2 are horizontally arranged between adjacent precast columns 1. Column connectors 6 are embedded in the precast columns 1 via the column frame 61, and beam connectors 7 are embedded in the ends of the precast beams 2 via the beam end frame 71. The beam connectors 7 at both ends of the precast beams 2 are symmetrically arranged. Due to the inclined surface 721 of the force transmission plate 72, the top of the force transmission plate 72 abuts against the column frame 61 on the precast column 1, and the inclined surface 721 of the force transmission plate 72... The spacing between the precast columns 1, which is smaller at the top and larger at the bottom, provides space for the precast beam 2 to rotate relative to the precast columns 1. During an earthquake, both ends of the precast beam 2 rotate around the top of the force transmission plate 72. Moreover, during the rotation, the remaining area of ​​the force transmission plate 72 will not contact the precast columns 1, and will not push open the precast columns 1 to form a beam elongation effect. This ensures that the spacing between the two precast columns 1 remains unchanged, and the two precast columns 1 will not exert a large reaction force on the precast beam 2. This ensures that the contact area between the precast columns 1 and the precast beam 2 will not be damaged by excessive compressive force. On the other hand, in order to ensure that seismic energy can be dissipated to minimize damage to the precast beam 2 and precast column 1, energy-dissipating components are also installed between the precast column 1 and the precast beam 2. These components include a first arc surface 621 and a second arc surface 724 that rub against each other between the force transmission plate 72 and the vertical shear force transmission plate 72. When the precast beam 2 rotates around the top of the force transmission plate 72, the two arc surfaces centered on the rotation point also rub against each other to dissipate seismic energy. Simultaneously, the force transmission plate 72, the vertical shear force transmission plate 62, the first friction plate 8, and the second friction plate 724... Plate 9 also constitutes another set of friction energy dissipation components. It relies on the frictional force converted from the compressive force of the bolts pressing them together for secondary friction energy dissipation. Furthermore, due to the arc-shaped elongated hole 82 on the first friction plate 8, when the precast beam 2 rotates around the top of the force transmission plate 72, the first friction plate 8 and the second friction plate 9 can also move relative to each other within a certain range to achieve better friction energy dissipation. At the same time, the arc-shaped elongated hole 82 also limits the range of relative displacement between the first friction plate 8 and the second friction plate 9, preventing excessive displacement that could lead to structural damage. In addition, the vertical shear force transmission plate 62, fixed relative to the precast column 1, and the force transmission plate 72, fixed relative to the precast beam 2, are vertically supported by the first and second arc-shaped surfaces. This support is movable, meaning it can still provide effective support during large deformations, and the support area remains essentially unchanged, thus solving the problem of unreliable vertical shear force exit paths at the beam ends during large deformations. In addition, since the distance between the two precast columns 1 remains basically unchanged, the deformation of the prestressed steel strands 3 installed in the precast beam 2 is also relatively small. This avoids the problem of excessive deformation, failure or even breakage of the prestressed steel strands 3.

[0025] Both the beam end frame 71 and the column frame 61 are provided with insertion holes 611 for threading prestressed steel strands 3. Corresponding to the insertion holes 611, the precast beam 2 has a downwardly convex parabolic threading channel, within which the prestressed steel strands 3 are threaded. This parabolic arrangement allows for a larger span and better load-bearing capacity.

[0026] The basic connector 10 includes a basic embedded plate 101 pre-embedded in the basic platform 4 and multiple connecting seats 102 detachably fixed on the basic embedded plate 101. The upper part of the connecting seat 102 has a U-shaped connecting frame, and the U-shaped connecting frame has a horizontal and coaxial connecting arc hole 1021. The column end connector 11 includes a column end frame 111 pre-embedded at the lower end of the precast column 1 and a column end connecting plate 112 fixed on the side of the column end frame 111. The column end connecting plate 112 is provided with a fifth bolt hole 1121 corresponding to the connecting arc hole 1021. The connection between the column end connecting plate 112 and the U-shaped connecting frame is realized by inserting a bolt into the fifth bolt hole 1121 and the connecting arc hole 1021. The foundation connector 10 and column end connector 11 between the precast column 1 and the foundation platform 4, especially the connecting arc-shaped hole 1021, can cooperate with the energy-dissipating structure between the beam and the column to achieve multi-level response characteristics. When the precast column 1 swings relative to the foundation platform 4, the U-shaped connecting frame and the column end connecting plate 112 dissipate energy through mutual friction generated by bolt compression. In particular, the connecting arc-shaped hole 1021 ensures that the two have a certain relative displacement, which can dissipate some seismic energy through reciprocating friction. At the same time, another pair of U-shaped connecting frames and column end connecting plates 112 set perpendicular to it can dissipate some seismic energy through metal deformation. The column end frame 111 is rectangular, with four column end connecting plates 112 symmetrically arranged around it, and four connecting seats 102 are correspondingly set on the foundation connector 10.

[0027] The prefabricated connection structure between precast columns and precast beams, and between precast columns and foundation platforms, as described in this application, exhibits multi-level response characteristics, capable of meeting performance requirements under different seismic ground motion levels. During minor earthquakes, the dampers (referring to the damping structures connecting precast columns and beams, and between precast columns and foundation platforms) are inactive, limiting the inter-story drift angle to within 0.18% (1 / 550), placing the structure in an elastic state; the performance objective is full usability. During moderate earthquakes, all dampers at the joints between precast beams and columns, and between precast columns and foundation platforms, activate frictional energy dissipation, limiting the inter-story drift angle to within 1%; the performance objective is full usability. During major earthquakes, dampers deployed perpendicular to the displacement direction at the joints between precast columns and foundation platforms activate significant metal yield energy dissipation, limiting the inter-story drift angle to within 2% (1 / 50); the performance objective is usability after repair. During a major earthquake, the limiting functions designed for prefabricated components and energy dissipation devices are activated, including the limiting function at the contact surface of the steel connectors at beam-column joints, the limiting function at the contact surface between the damper at the rotation center of the column base joint and the column base, and the limiting function of the damper itself. The inter-story drift angle of the structure is limited to 3%, and the performance objective is life safety.

[0028] The interaction between the precast beams and precast columns in this application adopts a rotational relationship with the top of the beam as the center. When the frame is displaced, the column spacing remains unchanged, eliminating the beam elongation effect caused by the opening of the beam-column contact surface in traditional self-centering concrete frame structures. The unbonded prestressed steel strands in the beams do not need to provide self-centering capability; the self-centering capability is provided only by the unbonded prestressed steel strands in the precast columns and the gravity of the structure. This avoids the risk of fracture of the prestressed steel strands caused by the beam elongation effect in traditional self-centering concrete frames. Therefore, the frame in this application decouples the self-centering function and the assembly function to a certain extent, significantly improving the robustness of the self-centering concrete frame.

[0029] The specially designed beam-column connectors of this application improve the force transmission mechanism of the joints, ensuring reliable transmission of vertical shear force at the beam ends during large deformations, thus enhancing the safety and durability of the self-centering concrete frame structure. Simultaneously, the use of parabolic unbonded prestressed steel strands within the precast beams, compared to the linear arrangement of traditional self-centering concrete frames, allows for larger spans and superior load-bearing capacity.

[0030] A prefabricated self-resetting concrete frame structure system with multi-level response characteristics is presented. It adopts five modules to complete the dry assembly of the structural system: column-to-column connection, column base-to-foundation connection, beam-to-slab connection, beam-to-column connection, and slab-to-slab connection. The specially designed beam-column connectors improve the force transmission mechanism of the nodes. The replaceable beam end energy dissipation device and column base energy dissipation device can provide multi-level energy dissipation and limiting function. The self-resetting ability is provided only by the prestressed steel strands in the precast columns and the gravity of the structure, which can avoid the risk of steel strand breakage caused by beam elongation effect and has good robustness.

[0031] The column base connection to the foundation includes components such as the foundation, column base connectors, unbonded prestressed steel strands, column base energy dissipation devices, foundation embedded steel plates, and bolts, used for assembling the column base with the foundation. The column base connectors are embedded in the bottom of the precast column and welded to its internal reinforcing steel. The foundation embedded steel plates are embedded in the top surface of the foundation and mat with the column base connectors. The column base energy dissipation device consists of column end energy dissipation connectors, foundation end energy dissipation connectors, column base friction plates, and bolts. The column base energy dissipation device can provide energy dissipation corresponding to different seismic motion levels, including metal yield energy dissipation and friction energy dissipation, and can also act as a limiting mechanism under major earthquakes.

[0032] The beams and columns are connected by unbonded prestressed steel strands that pass through prestressing ducts within the precast beams and columns to apply prestress and complete the assembly. The interaction between the precast beams and columns is based on a rotation center with the top of the beam as the rotation center. When the frame shifts, the column spacing remains constant, eliminating the beam elongation effect caused by the opening of the beam-column contact surface in traditional self-resetting concrete frame structures. Furthermore, the unbonded prestressed steel strands in the precast beams do not provide self-resetting capability. The vertical shear force transfer plate at the end of the beam has a circular arc surface at its mating point with the beam connector, designed according to the actual movement trajectory of the beam to ensure reliable transmission of vertical shear force at the beam end during large deformations. The beam connectors and column connectors are pre-embedded in the precast beams and columns, respectively. A replaceable beam-end energy dissipation device is configured in the beam-column joint area. This device consists of a column-end vertical shear force transfer plate, a beam-end friction plate (one type), a beam-end friction plate (two types), and bolts. The energy dissipation performance can be adjusted by regulating the preload of the bolts. The beam-end energy dissipation device also has a limit function to reduce the displacement response of the structure under severe earthquakes.

[0033] For column-to-column connection, column-to-column connector one and column-to-column connector two are pre-embedded at both ends of the precast column and welded to the internal steel reinforcement. Pre-embedded bolts are provided on the surface of column-to-column connector one, and bolt holes are provided at the joint of column-to-column connector two. Two steel strand holes are provided in the middle of the connector, and PVC pipes are pre-embedded inside the precast column as reserved holes for the steel strands. The precast columns are connected by unbonded prestressed steel strands, pre-embedded bolts on column-to-column connector one, and nuts on column-to-column connector two.

[0034] The beam-slab connection mainly consists of precast beams, precast slabs, beam-slab connectors, slab end connectors, bolts, and unbonded prestressed steel strands. Beam-slab connectors are embedded at equal intervals on the sides of the precast beams and welded to the internal reinforcing steel. End connectors are embedded in the precast slabs and welded to the internal reinforcing steel. The beam-slab connectors and end connectors are connected by bolts. Furthermore, slabs are connected to each other via end connectors, slab-to-slab connectors, and bolts embedded in the precast slabs.

[0035] The beneficial effects of this invention are: 1. The frame of this application has multi-level response characteristics, which can meet the performance requirements under different seismic ground motion levels. During minor earthquakes, the dampers are in an inactive state, the inter-story drift angle is limited to within 0.18% (1 / 550), the structure is in an elastic state, and the performance objective is full usability. During moderate earthquakes, all dampers at beam-column joints and column base joints are activated for frictional energy dissipation, the inter-story drift angle is limited to within 1%, and the performance objective is full usability. During major earthquakes, dampers deployed at column base joints perpendicular to the displacement direction activate significant metal yield energy dissipation, the inter-story drift angle is limited to within 2% (1 / 50), and the performance objective is usability after repair. During mega-earthquakes, the limiting effects designed in the precast components and energy dissipation devices are activated, including the limiting effect at the contact surface of the steel connectors at beam-column joints, the limiting effect at the contact surface between the damper at the rotation center of the column base joint and the column base, and the limiting effect of the dampers themselves. The inter-story drift angle is limited to 3%, and the performance objective is life safety.

[0036] 2. The frame of this application exhibits high robustness. The interaction between the precast beams and columns of the frame in this application is achieved by rotating around the top of the beam. When the frame undergoes displacement, the column spacing remains constant, eliminating the beam elongation effect caused by the opening of the beam-column contact surface in traditional self-centering concrete frame structures. The unbonded prestressed steel strands within the beams do not require self-centering capability; instead, the self-centering capability is provided solely by the unbonded prestressed steel strands within the precast columns and the gravity of the structure. This avoids the risk of fracture of the prestressed steel strands caused by beam elongation in traditional self-centering concrete frames. Therefore, the frame of this application decouples the self-centering function and the assembly function to a certain extent, significantly improving the robustness of the self-centering concrete frame.

[0037] 3. The specially designed beam-column connectors of the frame in this application improve the force transmission mechanism of the joint, which can ensure the reliable transmission of vertical shear force at the beam end during large deformation, thereby improving the safety and durability of the self-resetting concrete frame structure. At the same time, the precast beams use parabolic unbonded prestressed steel strands. Compared with the linear arrangement of traditional self-resetting concrete frames, the parabolic arrangement can achieve a larger span and better load-bearing capacity.

[0038] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. The scope of patent protection of the present invention shall be determined by the claims. Similarly, any equivalent structural changes made based on the description and drawings of the present invention shall also be included within the scope of protection of the present invention.

Claims

1. A prefabricated self-resetting concrete frame structure system with multi-level response characteristics, comprising: Precast columns; Precast beams connect two adjacent precast columns; Its characteristic is that it further includes: The column connector includes a column frame embedded in the precast column and a vertical shear force transfer plate fixed to one side of the column frame. The upper end face of the vertical shear force transfer plate is a first arc surface, and the vertical shear force transfer plate is provided with a first bolt hole. The beam connector includes a beam end frame embedded in the end of the precast beam and a force transmission plate fixed to the outer end of the beam end frame. The side of the force transmission plate near the precast column is inclined so that the distance between the force transmission plate and the precast column increases from top to bottom. The lower part of the force transmission plate is provided with a docking groove corresponding to the vertical shear force transmission plate. The top of the docking groove is provided with a second arc surface that corresponds to and fits with the first arc surface. The first and second arc surfaces are centered on the top of the force transmission plate. The side of the docking groove and the vertical shear force transmission plate have an movable gap to allow relative movement between the two. The force transmission plate is provided with a second bolt hole. The first friction plate has a third bolt hole corresponding to the second bolt hole. The first friction plate and the force transmission plate can be detachably connected by inserting bolts into the second and third bolt holes. The lower end has an inclined arc-shaped long hole with the top of the force transmission plate as the center. The second friction plate is provided with a fourth bolt hole, and a bolt is inserted into the fourth bolt hole and the arc-shaped elongated hole to achieve a detachable connection with the first friction plate.

2. The prefabricated self-resetting concrete frame structure system with multi-level response characteristics according to claim 1, characterized in that, There are two of each of the first and second friction plates, and they are arranged symmetrically about the force transmission plate.

3. The prefabricated self-resetting concrete frame structure system with multi-level response characteristics according to claim 1, characterized in that, Both the beam end frame and the column frame are provided with insertion holes for threading prestressed steel strands.

4. The prefabricated self-resetting concrete frame structure system with multi-level response characteristics according to claim 3, characterized in that, The precast beam has a convex parabolic threading channel corresponding to the threading hole, and the prestressed steel strands are threaded through the threading channel.

5. A prefabricated self-resetting concrete frame structure system with multi-level response characteristics according to claim 1, characterized in that, The first friction plate is L-shaped.

6. The prefabricated self-resetting concrete frame structure system with multi-level response characteristics according to claim 1, characterized in that, Also includes: Basic platform; The basic connector includes a foundation embedded plate pre-embedded in the foundation platform and multiple connectors that can be detachably fixed to the foundation embedded plate. The upper part of the connector has a U-shaped connector frame, and the U-shaped connector frame has a horizontal and coaxial connecting arc hole. The column end connector includes a column end frame embedded in the lower end of the precast column and a column end connecting plate fixed on the side of the column end frame. The column end connecting plate is provided with a fifth bolt hole corresponding to the connecting arc hole. The column end connecting plate is connected to the U-shaped connecting frame by inserting bolts through the fifth bolt hole and the connecting arc hole.

7. A prefabricated self-resetting concrete frame structure system with multi-level response characteristics according to claim 6, characterized in that, The column end frame is rectangular, with four column end connecting plates symmetrically arranged around the perimeter, and four connecting seats are correspondingly set on the foundation connectors.

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