Fabricated self-centering structural system based on layered rocking wall module and construction method thereof

Abstract

The application relates to a kind of layered rocking wall module-based fabricated self-centering structure systems, layered rocking wall module and prefabricated concrete beam are alternately stacked along the building height direction;Prefabricated concrete beam is connected between adjacent rocking wall unit by energy dissipation damper and first shear key;Post-tensioned rocking column is arranged at both ends of multiple prefabricated concrete beams, and is connected with prefabricated concrete beam through shear plate connector;Foundation is connected with the bottom of post-tensioned rocking column through second shear key with vertical long circular hole, and second shear key allows the rotation of column bottom of post-tensioned rocking column under the action of horizontal force, so as to release bending moment.The application realizes the uniform distribution and controllability of damage, and through the cooperative work of multiple independent wall units and distributed dampers in each layer, the seismic damage is changed from the traditional bottom concentrated mode to the controllable mode along the height, which improves the overall energy dissipation efficiency and the predictability of damage control of the structure.

Description

Technical Field

[0001] This invention belongs to the field of seismic resistance technology of building structures, specifically relating to a prefabricated self-resetting structural system based on layered rocking wall modules and its construction method. Background Technology

[0002] Precast concrete structures are widely used in modern buildings due to their advantages such as high construction efficiency and controllable component quality. However, under earthquake conditions, traditional cast-in-place or precast shear wall structures often suffer damage concentrated at the base of the walls, which easily leads to the formation of plastic hinges, resulting in large residual deformations and making post-earthquake repair difficult and costly.

[0003] To enhance the recoverability of buildings, self-resetting swaying structural systems have emerged. These systems typically allow walls to rotate within the foundation or at specific locations, and provide restoring capacity through post-tensioned prestressing tendons, thereby effectively reducing residual deformation. Typical examples include foundation swaying wall systems and multi-swaying wall systems.

[0004] However, existing self-resetting sway wall technology still has the following limitations: First, it relies on an "integral" wall as the sway unit, which means that the sway interface (rotation point) and energy dissipation devices are usually concentrated at the bottom of the structure or a few floors, making it difficult to achieve a uniform distribution of damage and energy dissipation along the entire height of the building, thus limiting the overall energy dissipation efficiency of the structure; second, this integrated sway mode has limited ability to control the higher-order vibration modes and floor acceleration response of mid- to high-rise buildings; and finally, there is still room for improvement in achieving high degree of prefabrication and convenient replacement of damaged components.

[0005] Therefore, there is an urgent need in this field for a new type of prefabricated seismic-resistant system that can break through the traditional monolithic rocking wall construction form, achieve uniform damage, distributed energy consumption, rapid functional recovery, and synergistic optimization of structural seismic response. Summary of the Invention

[0006] To address the problems of concentrated damage, weak control over higher-order vibration modes, and insufficient recoverability in existing self-resetting rocking wall systems, this invention aims to provide an innovative solution to achieve distributed damage, synergistic optimization of seismic performance, and rapid recovery of post-earthquake functions.

[0007] The present invention adopts the following technical solution:

[0008] A prefabricated self-resetting structural system based on layered swing wall modules includes a layered swing wall module 1, a post-tensioned swing column 2, and a foundation 3. The layered swing wall module 1 is a composite structure, including a precast concrete beam 12 and swing wall units 11. The layered swing wall module 1 and the precast concrete beam 12 are alternately stacked along the building height direction. The precast concrete beam 12 and the adjacent swing wall unit 11 are connected on both sides by energy-dissipating dampers 13 and first shear keys 14. The first shear key 14 is plate-shaped, with a portion of the plate having several connection holes, which are connected to the precast concrete beam 12 by fasteners. Another portion of the plate has several vertical... The vertical elongated oval hole 141 is connected to the swing wall unit 11 via fasteners, giving the swing wall module 1 a controllable degree of rotational freedom. The post-tensioned swing column 2 is set at both ends of the multiple precast concrete beams 12 and is connected to the precast concrete beams 12 via shear plate connectors 23. The foundation 3 is connected to the bottom of the post-tensioned swing column 2 via a second shear key 22 with a vertical elongated oval hole. The second shear key 22 allows the bottom of the post-tensioned swing column 2 to rotate under horizontal force, thereby releasing the bending moment. The foundation 3 is also connected to the bottom sides of the lowest swing wall unit 11 via the shear key 14 and the energy dissipation damper 13.

[0009] Preferably, the distance between two adjacent precast concrete beams 12 is equal to one story height of the building.

[0010] Preferably, the post-tensioned swaying column 2 is a precast concrete column with unbonded prestressed tendons 21 running through it. These prestressed tendons 21 are tensioned and anchored after the structure is assembled, enabling the system to achieve a self-resetting function.

[0011] Preferably, the layered swaying wall module 1 is a standardized fully prefabricated component, wherein: the swaying wall unit 11 is a rectangular cross-section prefabricated concrete wall with vertical and horizontal reinforcing bars inside; the net distance between adjacent wall units 11 is 1 to 2 times the thickness of a single swaying wall unit 11, in order to balance the lateral stiffness and the independence of the swaying motion of each unit; the prefabricated concrete beam 12 includes an upper beam 121 at the top of all swaying wall units 11 and a lower beam 122 at the bottom; and the energy-dissipating damper 13 is disposed at the corner of each swaying wall unit 11.

[0012] Furthermore, the energy dissipation damper 13 is a replaceable metal damper, which includes a core energy dissipation section made of low yield point steel and a constraint sleeve fitted on its outside and filled with epoxy resin to prevent the core section from buckling under pressure and to ensure stable hysteretic energy dissipation performance.

[0013] Preferably, the energy-dissipating damper 13 has a screw at its end, which is fixed to a pair of angle steels by a nut. One of the pair of angle steels is fixed to the swing wall unit 11, and the other is fixed to the precast concrete beam 12 or the foundation 3.

[0014] Preferably, the shear plate connector 23 includes a groove plate on one side and an insert plate on the other side. The insert plate is inserted into the groove plate and is hinged at the center by a pin. A transverse elongated hole 231 is opened on the groove plate above and below the pin, and the two transverse elongated holes 231 are parallel. A round hole is opened on the insert plate. A high-strength bolt passes through the transverse elongated hole 231 and the round hole, so that the beam end and the column body can rotate relative to each other, and vertical force can be transmitted at the same time.

[0015] Furthermore, the groove plate is fixed to the embedded plate at the column end, and the insert plate is fixed to the embedded plate at the beam end.

[0016] A construction method for the above-mentioned prefabricated self-resetting structural system based on layered rocking wall modules includes the following steps:

[0017] S1: Install column base nodes on foundation 3;

[0018] S2: After hoisting, tension the swing column 2 and place it in position, initially fixing it to the column base node;

[0019] S3: Install the layered swing wall module 1 layer by layer along the building height;

[0020] S4: Connect the ends of the precast concrete beams 12 in each layered swing wall module 1 to the post-tensioned swing columns 2 via shear plate connectors 23.

[0021] S5: Install energy-dissipating dampers 13 at the corners of each swing wall unit 11;

[0022] S6: Tensile the unbonded prestressed tendons 21 inside the swing column 2 after tensioning and anchoring.

[0023] The beneficial effects of this invention are as follows:

[0024] 1) Achieved uniform and controllable damage distribution: Through the coordinated work of multiple independently swaying wall units and distributed dampers at each level, the seismic damage was transformed from the traditional bottom-concentrated mode to a controllable mode distributed along the height, improving the overall energy consumption efficiency of the structure and the predictability of damage control.

[0025] 2) Optimized seismic performance: The synergistic mechanism of "independent swaying of layered modules" and "self-resetting of the overall system" enables the system to effectively control inter-story displacement while having a beneficial effect on floor acceleration and structural internal force distribution, improving the ability to coordinate control of multiple performance indicators, and is especially suitable for mid- to high-rise buildings.

[0026] 3) Improved structural recoverability: The main load-bearing components maintain basic elasticity during earthquakes and recover post-earthquake recovery through prestressing and gravity, resulting in minimal residual deformation. Damage is guided to replaceable dampers; this "fuse" design facilitates rapid and economical post-earthquake functional recovery.

[0027] 4) Promotes industrialized construction: All core components can be prefabricated in the factory and assembled on-site through standardized dry joints, which improves construction efficiency and project quality and is in line with the development direction of building industrialization. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the assembled self-resetting structure system in an embodiment of the present invention; it should be noted that... Figure 1 The image only shows components such as the energy-dissipating damper, the first shear key, and the second shear key on one side, while the corresponding components on the other side are arranged symmetrically.

[0029] Figure 2 for Figure 1 A structural diagram of a layered swing wall module for a single standard floor.

[0030] Figure 3 for Figure 2 Detailed construction diagram of the connection node between the swing wall unit and the precast concrete beam;

[0031] Figure 4 This is a detailed structural drawing of the connection node between the bottom of the post-tensioned sway column and the foundation;

[0032] Figure 5 This is a detailed structural drawing of the connection node between the post-tensioned sway column and the end of the precast concrete beam;

[0033] Figure 6 This is a schematic diagram showing the installation and connection of the energy-dissipating damper at the corner of the rocking wall unit.

[0034] In the diagram, 1. Layered swing wall module, 2. Post-tensioned swing column, 3. Foundation, 11. Swing wall unit, 12. Precast concrete beam, 13. Energy-dissipating damper, 14. First shear key, 21. Unbonded prestressed tendon, 22. Second shear key, 23. Shear plate connector, 231. Elongated hole, 121. Upper beam, 122. Lower beam, 141. Vertical elongated hole. Detailed Implementation

[0035] Overall Overview: The structural system of the solution consists of two aspects: First, a layered swaying wall module 1 is provided. The layered swaying wall module 1, as an independent lateral force resisting unit for a single floor of the building, includes: two or more prefabricated swaying wall units 11 arranged laterally along the building; prefabricated concrete beams 12 disposed at the top and bottom of all the swaying wall units 11; and multiple energy-dissipating dampers 13; wherein the upper and lower ends of each prefabricated swaying wall unit 11 are connected to the corresponding top and bottom prefabricated concrete beams via rotatable nodes; and each swaying wall unit 11 has an energy-dissipating damper 13 disposed at its corner.

[0036] Secondly, a prefabricated self-resetting structural system based on the aforementioned layered swaying wall modules is provided. The system includes: multiple layered swaying wall modules 1 as described above, the layered swaying wall modules 1 being vertically stacked along the building height direction; at least two post-tensioned swaying columns 2; wherein unbonded prestressed tendons are disposed throughout the post-tensioned swaying columns 2, and their bottoms are connected to the foundation via rotatable column base nodes; the end of a precast concrete beam 12 in each layered swaying wall module 1 is connected to the corresponding position of the post-tensioned swaying column 2 via beam-column connectors that allow relative rotation between the two; the unbonded prestressed tendons are tensioned, enabling the post-tensioned swaying columns to provide self-resetting capability for the entire structural system.

[0037] The nodes, column base nodes, and beam-column connectors that allow rotation can all be in the form of shear keys or shear plates with vertical elongated holes. The energy-dissipating damper is preferably a replaceable damper, such as a metal damper. The post-tensioned sway column provides self-restoring force through the elastic restoring force of the prestressed tendons and the structural gravity load.

[0038] The following description, in conjunction with the accompanying drawings and specific embodiments, further illustrates the following:

[0039] Define direction: such as Figure 1 , Figure 1 In the prefabricated self-resetting structure system, the front and back are called "sides", and the left and right are called "ends".

[0040] See Figure 1 The prefabricated self-resetting structure system based on the layered swing wall module mainly consists of multiple layered swing wall modules 1 stacked vertically along the building height direction, and post-tensioned swing columns 2 set at both ends of them, and is supported on the foundation 3 as a whole.

[0041] The post-tensioned swaying column 2 is a precast concrete column with unbonded prestressed tendons 21 running through it. These prestressed tendons are tensioned and anchored after the structure is assembled, and are the key component for the system to achieve its self-resetting function. The system achieves distributed control of damage and energy consumption through modular, layered swaying wall modules 1, and simultaneously achieves overall structural reset by relying on the restoring force provided by the post-tensioned swaying column 2.

[0042] See Figure 2 The layered swaying wall module 1, as an independent lateral force resisting unit constituting each floor, is a standardized, fully prefabricated component. Specifically, it includes:

[0043] Precast swaying wall units 11: There are two or more units, arranged at intervals along the transverse direction of the building (i.e., the direction of the main lateral force resistance). Each swaying wall unit 11 is a rectangular precast concrete wall with vertical and horizontal reinforcing bars inside. The clear distance between adjacent wall units 11 can be designed to be 1 to 2 times the thickness of a single wall unit to balance the lateral stiffness and the independence of the swaying motion of each unit.

[0044] Precast concrete beam 12: includes an upper beam 121 at the top of all swaying wall units 11 and a lower beam 122 at the bottom. The beam 12 has a large cross-sectional height to coordinate the deformation of each wall unit 11 in the same floor and effectively transfer floor shear force.

[0045] Energy dissipation damper 13: Located at the corner of each swing wall unit 11. In this embodiment, the energy dissipation damper 13 is a replaceable metal damper, comprising a core energy dissipation section made of low-yield-point steel, and a restraining sleeve fitted over it and filled with epoxy resin to prevent buckling of the core section under pressure and ensure stable hysteretic energy dissipation performance. In this embodiment, the energy dissipation damper 13 is the main replacement component during maintenance, which makes repair more convenient.

[0046] The system's functionality is achieved through the following connection nodes:

[0047] 1. Wall-beam connection node

[0048] See Figure 3 The sway wall unit 11 is connected to the precast concrete beam 12 via a node that allows it to rotate. A preferred embodiment employs a first shear key 14 with a vertical elongated hole.

[0049] Specifically, the first shear key 14 is fixed to the embedded part of the precast concrete beam 12 by high-strength bolts, and the vertical elongated hole 141 on it is connected to the embedded bolts at the top / bottom of the swing wall unit 11. This structure allows the swing wall unit 11 to rotate relative to the precast concrete beam 12 when under stress (i.e., to form a swing mechanism), while reliably transmitting horizontal shear force through the contact between the bolts and the wall of the vertical elongated hole 141.

[0050] 2. Column base node

[0051] See Figure 4 The bottom of the post-tensioned sway column 2 is connected to the foundation 3 via a rotatable column base node. One embodiment, similar to the wall-beam node, employs a second shear key 22 with a vertical elongated hole, allowing the column base to rotate under horizontal forces, thereby releasing the bending moment.

[0052] 3. Beam-column connection node

[0053] See Figure 5 The end of the precast concrete beam 12 is connected to the post-tensioned sway column 2 via a beam-column connector that allows relative rotation between the two. A preferred embodiment uses a shear plate connector 23. The shear plate connector 23 includes a grooved plate on one side and an insert plate on the other side. The insert plate is inserted into the grooved plate and hinged at the center by a pin. A transverse elongated hole 231 is provided on the grooved plate above and below the pin, and the two transverse elongated holes 231 are parallel. A circular hole is provided on the insert plate. High-strength bolts pass through the transverse elongated holes 231 and the circular hole, allowing relative rotation between the beam end and the column body, while also transmitting vertical force.

[0054] 4. Energy dissipation damper connection

[0055] See Figure 6 The energy-dissipating damper 13 is fixed at both ends to the adjacent rocking wall unit 11 and the precast concrete beam 12 via high-strength bolts and pre-embedded connectors. When an earthquake causes the wall unit 11 to rock, the vertical displacement difference between its corner and the beam will drive the damper 13 to undergo axial deformation, thereby dissipating energy. The damper 13 is an independent component and can be easily replaced if damaged.

[0056] The working principle of the system is as follows:

[0057] Under earthquake action, the swing wall units 11 on each floor rotate independently and asynchronously, forming a layered swing mechanism. The rotation of each unit drives the energy-dissipating dampers 13 at their corners to yield, exhibiting a distributed energy dissipation mode activated layer by layer. Simultaneously, the post-tensioned swing column 2 swings as a whole, stretching the unbonded prestressed tendons 21 inside. After the earthquake, the elastic restoring force of the prestressed tendons 21 and the structural gravity work together to cause the swing column 2 and each floor wall unit 11 to return to their initial positions, achieving overall self-resetting with minimal residual deformation. During this process, the main structure (swing wall unit 11, precast concrete beam 12, and post-tensioned swing column 2) basically maintains elasticity, and all inelastic damage is concentrated on the replaceable energy-dissipating dampers 13, thus achieving the design goals of controllable damage and rapid post-earthquake functional recovery.

[0058] The construction method of this invention mainly includes the following steps:

[0059] S1: Install column base nodes on foundation 3;

[0060] S2: After hoisting, tension the swing column 2 and place it in position, initially fixing it to the column base node;

[0061] S3: Install the layered swing wall module 1 layer by layer along the building height;

[0062] S4: Connect the ends of the precast concrete beams 12 in each module to the post-tensioned swing columns 2 via beam-column connectors;

[0063] S5: Install energy-dissipating dampers 13 at the corners of each swing wall unit 11;

[0064] S6: Tensile the unbonded prestressed tendons 21 inside the swing column 2 after tensioning and anchoring.

[0065] It should be noted that the above embodiments are merely examples to clearly illustrate the technical solution of the present invention. For those skilled in the art, reasonable modifications or equivalent substitutions made to the specific dimensions of the modules, the detailed structure of the connection nodes, the type of damper, or the sequence of construction steps, without departing from the core principle of the self-resetting system constituted by the "layered swing wall module" and the "post-tensioned swing column" as defined in the claims of the present invention, should all be considered to be included within the protection scope of the present invention.

Claims

1. A prefabricated self-resetting structural system based on a layered swing wall module, characterized in that: Includes layered swing wall module (1), post-tensioned swing column (2), and foundation (3); The layered swing wall module (1) is a combined structure, including a precast concrete beam (12) and a swing wall unit (11). The layered swing wall module (1) and the precast concrete beam (12) are stacked alternately along the building height direction; the precast concrete beam (12) and the adjacent swing wall unit (11) are connected on both sides by energy-dissipating dampers (13) and first shear keys (14); the first shear key (14) is plate-shaped, and a portion of the plate is provided with several connecting holes, which are connected to the precast concrete beam (12) by fasteners, and another portion of the plate is provided with several vertical elongated holes (141), which are connected to the swing wall unit (11) by fasteners, so that the swing wall module (1) has controllable rotational freedom; The post-tensioned swing column (2) is set at both ends of the plurality of precast concrete beams (12) and is connected to the precast concrete beams (12) through shear plate connectors (23); The foundation (3) is connected to the bottom of the post-tensioned swing column (2) via a second shear key (22) with a vertical elongated hole. The second shear key (22) allows the bottom of the post-tensioned swing column (2) to rotate under the action of a horizontal force, thereby releasing the bending moment. The foundation (3) is also connected to the bottom sides of the lowest swing wall unit (11) via the shear key (14) and the energy-dissipating damper (13).

2. The prefabricated self-resetting structural system based on a layered swing wall module as described in claim 1, characterized in that: The distance between two adjacent precast concrete beams (12) is one story height of the building.

3. The prefabricated self-resetting structural system based on layered swing wall modules as described in claim 1, characterized in that: The post-tensioned swing column (2) is a precast concrete column with unbonded prestressed tendons (21) running through it. The prestressed tendons (21) are tensioned and anchored after the structure is assembled, so that the system can achieve self-resetting function.

4. The prefabricated self-resetting structural system based on layered swing wall modules as described in claim 1, characterized in that: The layered swing wall module (1) is a standardized, fully prefabricated component, wherein: The swaying wall unit (11) is a precast concrete wall with a rectangular cross section and is equipped with vertical and horizontal reinforcing bars inside. The net distance between adjacent wall units (11) is 1 to 2 times the thickness of a single swaying wall unit (11) to balance the lateral stiffness and the independence of the swaying motion of each unit. The precast concrete beam (12) includes an upper beam (121) at the top of all the rocking wall units (11) and a lower beam (122) at the bottom. Energy-dissipating dampers (13) are located at the corners of each swing wall unit (11).

5. The prefabricated self-resetting structural system based on a layered swing wall module as described in claim 4, characterized in that: The energy-dissipating damper (13) is a replaceable metal damper, which includes a core energy-dissipating section made of low yield point steel and a restraint sleeve fitted on its outside and filled with epoxy resin to prevent the core section from buckling under pressure and to ensure stable hysteretic energy dissipation performance.

6. The prefabricated self-resetting structural system based on layered swing wall modules as described in claim 1, characterized in that: The end of the energy-dissipating damper (13) is equipped with a screw and is fixed to a pair of angle steels by a nut. One of the pair of angle steels is fixed to the swing wall unit (11), and the other is fixed to the precast concrete beam (12) or the foundation (3).

7. The prefabricated self-resetting structural system based on layered swing wall modules as described in claim 1, characterized in that: The shear plate connector (23) includes a groove plate on one side and an insert plate on the other side, the insert plate being inserted into the groove plate and hinged at the center by a pin. A transverse elongated hole (231) is made on the slot plate above and below the pin, the two transverse elongated holes (231) are parallel, and a round hole is made on the insert plate; High-strength bolts pass through the transverse elongated hole (231) and the round hole, allowing relative rotation between the beam end and the column body, while also transmitting vertical force.

8. The prefabricated self-resetting structural system based on a layered swing wall module as described in claim 7, characterized in that: The groove plate is fixed to the embedded plate at the column end, and the insert plate is fixed to the embedded plate at the beam end.

9. A construction method for a prefabricated self-resetting structural system based on layered swing wall modules as described in claim 1, characterized in that, Includes the following steps: S1: Install column base nodes on the foundation (3); S2: After hoisting, tension the swing column (2) and position it, initially fixing it to the column base node; S3: Install the layered swing wall modules layer by layer along the building height (1); S4: Connect the ends of the precast concrete beams (12) in each layered swing wall module (1) to the post-tensioned swing columns (2) through shear plate connectors (23); S5: Install energy-dissipating dampers (13) at the corners of each swing wall unit (11); S6: Tensile unbonded prestressed tendons (21) in the swing column (2) after tensioning and anchoring.

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