Wall foot self-resetting hidden frame-cold-formed steel combined wall

Abstract

The utility model belongs to the technical field of building structures, and particularly relates to a hidden frame-cold-formed steel combined wall with a self-resetting wall foot. The combined wall body adopts embedded columns as edge components, the embedded columns are embedded into the two sides of the wall body, column bottom flange plates are welded to the bottoms of the embedded columns, the embedded columns are connected with a foundation through wall foot connecting plates, meanwhile, bolt holes are reserved to achieve assembly type connection, and self-resetting damper containing cavities are reserved between the column bottom flange plates and the wall foot connecting plates. According to the wall foot component, multiple sections of variable-cross-section stiffening steel plates serve as main energy dissipation components, a vertically-arranged disc spring set serves as a self-reset component, and the multiple sections of variable-cross-section stiffening steel plates and the vertically-arranged disc spring set are connected in parallel to form a self-reset damper and are only arranged on the bottom wall. The energy dissipation component and the disc spring set are connected to the column bottom flange plate and the wall foot connecting plate through bolts and hinge joints correspondingly, and it is ensured that the energy dissipation component and the disc spring set are independently mounted and dismounted in the self-resetting damper containing cavity. The anti-seismic performance and the post-earthquake recovery capacity of the cold-formed steel wall are improved, assembly is convenient and fast, and construction is environmentally friendly.

Description

Technical Field

[0001] This utility model relates to the field of building structure technology, specifically to a self-resetting concealed frame-cold-formed steel composite wall. Background Technology

[0002] Cold-formed steel structure systems mainly consist of wall systems, floor systems, and roof systems, with the wall system playing a crucial role in vertical load-bearing and horizontal lateral force resistance. Given my country's limited per capita land resources, promoting the application of low-rise cold-formed steel structures in multi-story and mid-rise buildings is imperative. In this process, it is essential to first ensure the reliable mechanical properties of the structurally critical wall system. While meeting vertical load-bearing requirements, the seismic performance of the walls receives greater attention.

[0003] Currently, a common method to improve the seismic performance of cold-formed steel composite walls is to insulate existing composite walls within a regular steel frame, forming a frame-cold-formed thin-walled steel composite wall system. This system utilizes the steel frame and composite walls to jointly resist seismic forces, thereby improving the overall seismic performance of the structure. While research has shown that the steel frame can constrain the insulated composite walls, thus strengthening them, and that the frame and composite walls can work together effectively with good seismic performance, they are not strictly speaking a single unit. The connection characteristics between the composite walls and the frame significantly affect their combined performance; structurally, they are still two separate components resisting shear energy dissipation at different stages.

[0004] Currently, steel frame-cold-formed thin-walled steel composite wall structures do not employ self-centering systems at the wall base in engineering applications. Under strong earthquakes, the failure mode is mainly concentrated at critical locations such as the bottom of the wall and the base of the frame columns. The wall often experiences significant localized plastic deformation or even yielding failure before the steel frame gradually bears more load, resulting in the overall load-bearing capacity and lateral stiffness of the structure not being fully utilized. This failure mode typically leads to a rapid decline in the structure's load-bearing capacity, complex repairs, and difficulty in restoring its functionality, ultimately causing substantial economic losses. Utility Model Content

[0005] To address the shortcomings of existing research, the purpose of this invention is to provide a self-resetting concealed frame-cold-formed steel composite wall that improves overall integrity while also considering energy dissipation capacity and self-resetting function. This effectively solves the problems of large residual deformation, difficult repair, and unusability of steel frame-cold-formed steel shear walls after damage.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] A self-resetting concealed frame-cold-formed steel composite wall includes an upper wall unit and a bottom wall unit arranged vertically. The upper wall unit and the bottom wall unit are connected to the steel beam via flange joints and bolts or self-tapping screws. The bottom wall unit is equipped with a self-resetting damper consisting of a replaceable soft steel damper and a disc spring reset device at its base. The upper wall unit and the bottom wall unit are respectively embedded into both sides of the wall using concealed columns as edge members. They are connected to the steel beam via flange joints at both ends of the concealed columns to form a concealed frame system.

[0008] The aforementioned self-resetting concealed frame-cold-formed steel composite wall has a column base flange plate welded to the lower end of the concealed column at the bottom of the wall. A wall base connecting plate is installed and connected to the foundation by a third bolt. A self-resetting damper mounting cavity is reserved between the column base flange plate and the wall base connecting plate, which are arranged in parallel. The upper and lower ends of a replaceable soft steel damper are connected in the self-resetting damper mounting cavity by a first bolt and a second bolt, respectively. The upper and lower ends of the disc spring reset device are connected to the column base flange plate and the wall base connecting plate by hinge joints, respectively. A trapezoidal stiffening rib is provided on the top of the column base flange plate directly above the disc spring reset device. The trapezoidal stiffening rib is welded to the column base flange plate and the concealed column at the bottom of the wall.

[0009] The self-resetting concealed frame-cold-formed steel composite wall at the wall base has disc spring reset devices arranged on both sides of the replaceable soft steel damper along the wall thickness direction, so that the replaceable soft steel damper and the disc spring reset device are connected in parallel to form a self-resetting damper.

[0010] The self-resetting concealed frame-cold-formed steel composite wall with self-resetting base, the self-resetting damper installation cavity reserved between the column bottom flange plate and the wall base connecting plate is determined according to the area of ​​failure at the foot of the concealed column-steel beam flange connection cold-formed steel shear wall under seismic load. According to the actual load conditions, the self-resetting damper installation cavity extends further into the bottom wall. At this time, two or more soft steel dampers can be replaced in parallel and matched with corresponding disc spring reset devices.

[0011] The aforementioned self-resetting concealed frame-cold-formed steel composite wall with replaceable soft steel dampers includes a bottom connecting plate, a top connecting plate, a fixing plate, damper stiffening ribs, wall base force transmission components, and variable cross-section stiffening steel plates. The specific structure is as follows: A wall base force transmission component with an I-shaped cross-section is vertically welded to the bottom of the horizontal top connecting plate. Fixing plates and damper stiffening ribs are vertically welded to the tops of two horizontally opposite bottom connecting plates, respectively. One set of fixing plates on each bottom connecting plate is vertically welded to the damper stiffening ribs. The two sets of fixing plates and damper stiffening ribs are symmetrical, with the fixing plates located on the inner side and the damper stiffening ribs on the outer side. The wall base force transmission components are welded to the corresponding fixing plates via variable cross-section stiffening steel plates. The top connecting plate and the wall base force transmission components are welded to form component two. The bottom connecting plate, fixing plate, and damper stiffening ribs are welded to form component one. Component one (A), component two (B), and the variable cross-section stiffening steel plates are welded to form the overall structure.

[0012] The self-resetting concealed frame-cold-formed steel composite wall at the wall base has damper stiffening ribs whose dimensions are optimized according to the actual horizontal load on the wall base, and whose width accounts for at least 1 / 5 or more of the entire replaceable soft steel damper.

[0013] The self-resetting concealed frame-cold-formed steel composite wall at the wall base has a load-bearing capacity of replaceable soft steel dampers that is basically equal to or slightly less than the wall base being replaced.

[0014] The aforementioned self-resetting concealed frame-cold-formed steel composite wall with variable cross-section stiffening steel plates is characterized in that the variable cross-section stiffening steel plates are prefabricated using low yield point steel, and the variable cross-section stiffening steel plates adapt to a lower strength as they approach the center of the wall. The parallel replaceable soft steel dampers are configured with two or more strength gradients. The variable cross-section stiffening steel plates are arranged at equal intervals along the height of the wall, with a thickness of at least 6mm or more. Different sizes, strengths, and quantities of variable cross-section stiffening steel plates are used as needed.

[0015] The self-resetting concealed frame-cold-formed steel composite wall at the wall base has components A, B, column base flange plate, and wall base connecting plate with higher strength than the variable cross-section stiffening steel plate and a thickness greater than twice or more than the variable cross-section stiffening steel plate. This ensures that the main destructive and energy-consuming components of the replaceable soft steel damper are concentrated only in the variable cross-section stiffening steel plate.

[0016] The self-resetting concealed frame-cold-formed steel composite wall at the wall base includes a disc spring reset device comprising a hinge joint, an outer sleeve, disc springs, an inner rod, and baffles. The specific structure is as follows: the inner rod is inserted into the outer sleeve, and the vertically arranged disc springs are installed between two baffles on the inner rod as self-resetting components. The disc springs can be arranged in a stacked, paired, or combined manner. The lower end of the outer sleeve and the upper end of the inner rod are respectively provided with hinge joints corresponding to the column base flange plate and the wall base connecting plate.

[0017] The design concept of this utility model is:

[0018] As seismic design principles for buildings gradually shift from traditional collapse-resistant designs to recoverable functional designs, replaceable soft steel dampers are employed at the base of the walls, combined with disc spring reset devices, while fully considering the connection characteristics of frame-composite wall structures. This ensures effective reduction of residual deformation after an earthquake, improves structural repairability, extends building lifespan, and lowers maintenance costs. This improvement not only aligns with the trends of modern industrialized construction and green sustainable development but also provides a reliable engineering solution for seismic design in high-intensity seismic fortification zones.

[0019] This utility model's composite wall uses concealed columns as edge components. These columns are embedded on both sides of the wall, with column base flanges welded to their bottoms. A wall foot connecting plate connects to the foundation, and bolt holes are pre-drilled for assembly-type connection. A self-resetting damper mounting cavity is reserved between the column base flange and the wall foot connecting plate. The wall foot component consists of multiple variable cross-section stiffening steel plates as the main energy dissipation components, and vertically arranged disc spring assemblies as the self-resetting components. These two components are connected in parallel to form a self-resetting damper, which is only located at the bottom of the wall. The energy dissipation components and disc spring assemblies are connected to the column base flange and wall foot connecting plate respectively via bolts and hinged joints, ensuring independent installation and disassembly within the self-resetting damper mounting cavity.

[0020] In the above technical solution, the present invention has the following advantages and beneficial effects:

[0021] 1. This utility model enhances the overall integrity of the wall by embedding concealed columns within the double-honeycomb core wall between columns, thus ensuring that the self-resetting damping device can be applied to cold-formed steel structure systems. Concealed columns are formed by bending corrugated steel plates at a specific angle and connecting them to square steel tubes, embedding them inside the wall. These concealed columns not only serve as edge members of the shear wall, connecting to the cold-formed steel edge columns, but also connect to the steel beams via flange joints, forming a concealed frame system. This design results in a tighter connection between the wall and the frame, reducing local deformation at connection nodes in traditional frame-composite wall systems and significantly improving the overall lateral stiffness and seismic performance of the wall.

[0022] 2. This utility model introduces a replaceable soft steel damper at the wall base, prefabricated using low-yield-point steel. When the structure is subjected to seismic loads, this damper dissipates seismic energy through plastic deformation, effectively reducing the seismic response of the main structure and minimizing internal structural damage. Simultaneously, a disc spring device provides self-resetting capability, enabling the structure to quickly return to its original position after an earthquake, thereby significantly reducing residual deformation and improving the building's repairability. Furthermore, when the force-transmitting components at the wall base are subjected to tensile and compressive loads, the disc spring device provides restoring force on both sides, ensuring a clear force transmission path and maximizing the restoring capability.

[0023] 3. This utility model features a pre-reserved cavity at the base of the wall for the self-resetting damper. The damper and disc spring assembly are secured separately using bolts and hinged joints, enabling independent operation during installation and disassembly. This design ensures that the disc spring assembly continues to provide restoring force when the damper is replaced, maintaining structural stability and functional integrity during maintenance. By optimizing component replacement methods, this utility model improves structural maintainability, extends service life, and meets the requirements of modern industrialized construction and environmental protection.

[0024] 4. All components of the wall in this invention can be precisely prefabricated in the factory, ensuring dimensional accuracy and quality stability. This not only reduces quality problems caused by human error in traditional construction but also improves material utilization and reduces waste. Simultaneously, prefabricated components can be quickly assembled on-site, eliminating the need for cumbersome on-site welding and thus lowering the technical requirements and assembly difficulty for construction workers. Furthermore, the variable cross-section stiffening steel plates used in this invention can be flexibly optimized in terms of size, quantity, and strength according to actual engineering needs, ensuring excellent seismic resistance under various earthquake conditions. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the overall structure of the self-resetting concealed frame-cold-formed steel composite wall of this utility model.

[0026] Figure 2 This is a schematic diagram of the cross-sectional layout of the upper wall unit.

[0027] Figure 3 This is a schematic diagram of the cross-sectional layout of the bottom wall unit.

[0028] Figure 4 This is a schematic diagram of the overall structure of the wall-mounted self-resetting damper.

[0029] Figure 5 This is a schematic diagram of a replaceable soft steel damper.

[0030] Figure 6 This is a structural breakdown diagram of a replaceable soft steel damper.

[0031] Figure 7 This is a schematic diagram of the disc spring reset device.

[0032] The labels in the diagram represent the following: 1-Bottom wall unit, 2-Upper wall unit, 3-Column base flange plate, 4-Wall foot connection plate, 5-Replaceable soft steel damper, 6-Disc spring reset device, 7-Trapezoidal stiffening rib, 8-Bottom wall concealed column, 9-Flange node, 10-Upper wall concealed column, 11-Steel beam, 12-Upper wall cold-formed steel edge column, 13-Upper wall corrugated steel plate, 14-Upper wall cold-formed steel intermediate column, 15-Upper wall external OSB plate cladding, 16-Bottom wall cold-formed steel edge column, 17-Bottom wall corrugated steel plate, 18- Bottom wall cold-formed steel intermediate column, 19-bottom wall outer OSB plate; (5-1)-first bolt, (5-2)-second bolt, (5-3)-third bolt, (5-4)-bottom connecting plate, (5-5)-top connecting plate, (5-6)-fixing plate, (5-7)-damping stiffening rib, (5-8)-wall foot force transmission component, (5-9)-variable cross section stiffening steel plate, (6-1)-hinged joint, (6-2)-outer sleeve, (6-3)-disc spring, (6-4)-inner rod, (6-5)-baffle, A-component one, B-component two. Detailed Implementation

[0033] The specific technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings. It should be noted that this utility model is not limited to the following specific embodiments; all equivalent modifications made based on the technical solutions of this application fall within the protection scope of this utility model.

[0034] It should be noted that the terms "first" and "second" used in this utility model are merely descriptive and do not specifically refer to any particular type of bolt. The specific type of bolt used will be determined based on the actual engineering conditions.

[0035] like Figures 1 to 7 As shown, this utility model provides a self-resetting concealed frame-cold-formed steel composite wall, the structure of which includes an upper wall unit 2 and a bottom wall unit 1 arranged vertically. The bottom end of the upper wall unit 2 and the top end of the bottom wall unit 1 are connected to the steel beam 11 by a flange node 9 and bolts or self-tapping screws. Only the bottom wall unit 1 is equipped with a self-resetting damper consisting of a replaceable soft steel damper 5 and a disc spring reset device 6 at the wall foot, thereby ensuring that the energy dissipation capacity of the soft steel damper 5 is maximized and the reset force of the disc spring reset device 6 is fully utilized.

[0036] The bottom wall unit 1 and the upper wall unit 2 are identical only in the base of the wall.

[0037] like Figure 2As shown, the upper wall unit 2 consists of components such as the upper wall concealed column 10, the upper wall cold-formed steel edge column 12, the upper wall corrugated steel plate 13, the upper wall cold-formed steel middle column 14, and the upper wall external OSB board 15. The specific structure is as follows:

[0038] Between two relatively parallel upper wall panels clad in OSB boards 15, upper wall concealed columns 10, upper wall cold-formed steel edge columns 12, upper wall corrugated steel plates 13, and upper wall cold-formed steel intermediate columns 14 are installed sequentially from both ends to the middle. Two sets of upper wall cold-formed steel edge columns 12 are located inside one of the upper wall concealed columns 10. Each set of two upper wall cold-formed steel edge columns 12 is symmetrically arranged with their openings facing outwards. Similarly, each set of two upper wall cold-formed steel intermediate columns 14 is symmetrically arranged. Located in the middle with the opening facing outward, two corrugated steel plates 13 of the upper wall are symmetrically arranged between the two outer OSB plates 15 of the upper wall. Each corrugated steel plate 13 of the upper wall is a plate structure with trapezoidal corrugations in a regular distribution. The two ends of the two corrugated steel plates 13 of the upper wall extend to a set of two cold-formed steel side columns 12 of the upper wall and are connected and fixed. The middle part of the two corrugated steel plates 13 of the upper wall passes through a set of two cold-formed steel middle columns 14 of the upper wall and is connected and fixed.

[0039] The two upper wall cladding OSB panels 15 are respectively connected to the corresponding upper wall concealed columns 10, upper wall cold-formed steel edge columns 12, upper wall corrugated steel plates 13, and upper wall cold-formed steel intermediate columns 14 using self-tapping screws. The upper wall corrugated steel plates 13 are also connected to the corresponding upper wall cold-formed steel edge columns 12, upper wall cold-formed steel intermediate columns 14, upper wall concealed columns 10, and upper wall cladding OSB panels 15 using self-tapping screws. At the same time, the end of the upper wall corrugated steel plates 13 is bent twice at 90 degrees. The first bend sandwiches the steel plate between the upper wall cold-formed steel edge columns 12 and the upper wall concealed columns 10, and the second bend sandwiches the steel plate between the upper wall cladding OSB panels 15 and the upper wall concealed columns 10. Both are connected by self-tapping screws, thus ensuring a tighter connection between the concealed columns and the wall and better overall integrity.

[0040] like Figure 3 As shown, the bottom wall unit 1 consists of components such as the bottom wall concealed column 8, the bottom wall cold-formed steel side column 16, the bottom wall corrugated steel plate 17, the bottom wall cold-formed steel middle column 18, the bottom wall outer OSB plate 19, and self-resetting dampers located at the two feet of the bottom wall unit 1. The specific structure is as follows:

[0041] Between two relatively parallel bottom wall panels clad in OSB boards 19, bottom wall concealed columns 8, bottom wall cold-formed steel edge columns 16, bottom wall corrugated steel plates 17, and bottom wall cold-formed steel intermediate columns 18 are installed sequentially from both ends to the middle. Two sets of bottom wall cold-formed steel edge columns 16 are located inside one of the bottom wall concealed columns 8. Each set of two bottom wall cold-formed steel edge columns 16 are symmetrically arranged with their openings facing outwards. Similarly, each set of two bottom wall cold-formed steel intermediate columns 18 are symmetrically arranged... The two bottom wall corrugated steel plates 17 are symmetrically arranged between the two bottom wall outer OSB plates 19, with the opening facing outward. Each bottom wall corrugated steel plate 17 is a plate structure with trapezoidal corrugations regularly distributed. The two ends of the two bottom wall corrugated steel plates 17 extend to a set of two bottom wall cold-formed steel side columns 16 and are connected and fixed. The middle part of the two bottom wall corrugated steel plates 17 passes through a set of two bottom wall cold-formed steel middle columns 18 and is connected and fixed.

[0042] The two bottom wall cladding OSB boards 19 are respectively connected to the corresponding bottom wall concealed columns 8, bottom wall cold-formed steel edge columns 16, bottom wall corrugated steel plates 17, and bottom wall cold-formed steel intermediate columns 18 using self-tapping screws. The bottom wall corrugated steel plates 17 are also connected to the corresponding bottom wall cold-formed steel edge columns 16, bottom wall cold-formed steel intermediate columns 18, bottom wall concealed columns 8, and bottom wall cladding OSB boards 19 using self-tapping screws. At the same time, the ends of the bottom wall corrugated steel plates 17 are bent twice at 90 degrees. The first bend sandwiches the steel plate between the bottom wall cold-formed steel edge columns 16 and the bottom wall concealed columns 8, and the second bend sandwiches the steel plate between the bottom wall cladding OSB boards 19 and the bottom wall concealed columns 8. Both are connected by self-tapping screws, thus ensuring a tighter connection between the concealed columns and the wall and better overall integrity.

[0043] Among them, the bottom wall hidden column 8 and the upper wall hidden column 10 not only serve as edge components of the shear wall, but also connect with the flange nodes 9 at both ends of the steel beam 11 to form a hidden frame system.

[0044] A column base flange plate 3 is welded to the lower end of the concealed column 8 in the bottom wall, and a wall foot connecting plate 4 is installed and connected to the foundation by a third bolt 5-3. A self-resetting damper mounting cavity is reserved between the column base flange plate 3 and the wall foot connecting plate 4, which are arranged in parallel. The upper and lower ends of the replaceable soft steel damper 5 are connected in the self-resetting damper mounting cavity by a first bolt 5-1 and a second bolt 5-2, respectively. The upper and lower ends of the disc spring reset device 6 are connected to the column base flange plate 3 and the wall foot connecting plate 4 by hinge joints 6-1, respectively. The disc spring reset devices 6 are arranged on both sides of the replaceable soft steel damper 5 along the wall thickness direction, so that the replaceable soft steel damper 5 and the disc spring reset device 6 are connected in parallel to form a self-resetting damper. The two can be operated independently during installation and disassembly, thereby ensuring that the disc spring assembly can continue to provide reset force when the damper is replaced, so that the structure maintains stability and functional integrity during maintenance. In addition, a trapezoidal stiffening rib 7 is installed on the top of the column base flange plate 3 directly above the disc spring reset device 6. The trapezoidal stiffening rib 7 is welded to the column base flange plate 3 and the concealed column 8 in the bottom wall, thereby preventing the edge of the column base flange plate 3 from bending due to the reset force of the disc spring reset device 6. All bolt connections use two or more rows. The type and size of the bolts are determined according to the specific situation, and the most suitable bolts are selected.

[0045] like Figures 4-6 As shown, the replaceable soft steel damper 5 includes a bottom connecting plate 5-4, a top connecting plate 5-5, a fixing plate 5-6, a damper stiffening rib 5-7, a wall base force transmission component 5-8, and a variable cross-section stiffening steel plate 5-9. The specific structure is as follows: The bottom of the horizontal top connecting plate 5-5 is vertically welded with a wall base force transmission component 5-8 with an I-shaped cross-section. The tops of the two horizontally opposite bottom connecting plates 5-4 are respectively vertically welded with a fixing plate 5-6 and a damper stiffening rib 5-7. A set of fixing plates 5-6 on each bottom connecting plate 5-4 is vertically welded to the damper stiffening rib 5-7. The two sets of fixing plates 5-6 and damper stiffening ribs 5-7 are symmetrical, with the fixing plates 5-6 located on the inner side and the damper stiffening ribs 5-7 located on the outer side. The wall base force transmission component 5-8 is welded to the corresponding fixing plate 5-6 through a variable cross-section stiffening steel plate 5-9. The stiffening ribs of the damper need to be optimized in size according to the actual horizontal load on the wall base, and their width should be at least 1 / 5 or more of the entire replaceable soft steel damper.

[0046] During fabrication, the top connecting plate 5-5 and the wall base force transmission component 5-8 are first welded together to form component B, ensuring a clear force transmission path. Then, the bottom connecting plate 5-4, the fixing plate 5-6, and the damper stiffening rib 5-7 are welded together to form component A. Component A mainly provides in-plane lateral stiffness, ensuring that the replaceable soft steel damper 5 is always in a tension-compression cyclic loading state under seismic loading. Finally, component A, component B, and the variable cross-section stiffening steel plate 5-9 are welded together to form the overall structure.

[0047] like Figure 7 As shown, the disc spring reset device 6 includes a hinge joint 6-1, an outer sleeve 6-2, a disc spring 6-3, an inner rod 6-4, and a baffle 6-5. The specific structure is as follows: the inner rod 6-4 is inserted into the outer sleeve 6-2, and the vertically arranged disc spring 6-3 is installed between the two baffles 6-5 on the inner rod 6-4 as a self-resetting component. The disc spring 6-3 can be arranged in a stacked, paired, or combined manner. The lower end of the outer sleeve 6-2 and the upper end of the inner rod 6-4 are respectively provided with hinge joints 6-1 corresponding to the column base flange plate 3 and the wall foot connecting plate 4.

[0048] The self-resetting damper mounting cavity reserved between the column base flange plate 3 and the wall foot connecting plate 4 is determined based on the area of ​​failure at the foot of the cold-formed steel shear wall with concealed column-steel beam flange connection under seismic load. It is not limited to the bottom of the concealed column 8 and the bottom of the cold-formed steel side column 12 of the bottom wall. Depending on the actual load conditions, the self-resetting damper mounting cavity can be further extended into the bottom wall. At this time, multiple replaceable soft steel dampers 5 can be connected in parallel and used in conjunction with the disc spring reset device 6. Although part of the space of the bottom wall unit 1 is removed and the cross-section is weakened, since the wall foot force transmission components 5-8 do not directly contact the wall foot connecting plate 4, but a certain space is reserved between them, there is a certain unloading effect under tensile and compressive loads. Preliminary studies have shown that there is no obvious stress concentration phenomenon in the corrugated steel plate 13 at the cut around the replaceable soft steel damper 5.

[0049] The load-bearing capacity of the replaceable soft steel damper 5 is basically equal to or slightly less than that of the wall base being replaced, but its energy dissipation capacity and deformation capacity are much greater than those of the replaced part, thus concentrating the dissipation of externally input seismic energy and protecting the main structure from significant damage.

[0050] Furthermore, the force transmission components 5-8 at the base of the wall have an I-shaped cross section. The force transmission plate in the middle directly transmits the force, while the flanges on both sides provide a certain torsional stiffness, thereby effectively suppressing the torsional deformation and eccentric effect that may occur during the load transmission process and ensuring the stability of the structure under stress.

[0051] Furthermore, the variable cross-section stiffening steel plate 5-9 is prefabricated using low yield strength steel (standard GB / T 28905-2022 "Low Yield Strength Steel Plates for Construction", grades LY100, LY160, LY225, etc.). Considering that the load on the bottom of the wall decreases as it approaches the center of the wall in the direction parallel to the wall, the variable cross-section stiffening steel plate 5-9 can adapt to the decreasing strength as it approaches the center of the wall. The parallel replaceable soft steel damper 5 can be set with multiple strength gradients, thereby ensuring full utilization of the material.

[0052] Furthermore, the variable cross-section stiffening steel plates 5-9 of a single replaceable soft steel damper 5 can be of different sizes, strengths, and quantities depending on the actual stress state. For example... Figures 4-6 As shown, the variable cross-section stiffening steel plate 5-9 can be a cross-shaped stiffener, and the four stiffeners constituting the variable cross-section stiffening steel plate 5-9 have an arc-shaped variable cross-section structure with a lower middle and higher ends. The variable cross-section stiffening steel plates 5-9 are arranged at equal intervals along the height of the wall, and the thickness must be at least 6mm or more.

[0053] Furthermore, the strength of component A, component B, column base flange plate 3, and wall foot connecting plate 4 must be higher than that of variable cross-section stiffening steel plate 5-9, and the thickness must be more than twice that of variable cross-section stiffening steel plate 5-9, to ensure that the main destructive and energy-consuming components of the replaceable soft steel damper 5 are concentrated only in the variable cross-section stiffening steel plate 5-9.

[0054] The results show that this invention improves the seismic performance and post-earthquake recovery capability of cold-formed steel walls, and is convenient to assemble and environmentally friendly to construct.

[0055] Finally, it should be noted that the above description only illustrates certain exemplary embodiments of the present invention. Those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A self-resetting concealed frame-cold-formed steel composite wall, characterized in that, It includes an upper wall unit and a bottom wall unit, which are set up vertically. The upper wall unit and the bottom wall unit are connected to the steel beam by flange nodes and bolts or self-tapping screws. The bottom wall unit is equipped with a self-resetting damper consisting of a replaceable soft steel damper and a disc spring reset device at the wall foot. The upper wall unit and the bottom wall unit are respectively embedded into the two sides of the wall by hidden columns of the upper wall unit and the hidden columns of the bottom wall unit as edge members. They are connected to the flange nodes at both ends of the steel beam through the hidden columns of the upper wall unit and the hidden columns of the bottom wall unit to form a hidden frame system.

2. The self-resetting concealed frame-cold-formed steel composite wall as described in claim 1, characterized in that, A column base flange plate is welded to the lower end of the concealed column in the bottom wall, and a wall foot connecting plate is installed and connected to the foundation by a third bolt. A self-resetting damper mounting cavity is reserved between the column base flange plate and the wall foot connecting plate, which are arranged in parallel. The upper and lower ends of the replaceable soft steel damper are connected in the self-resetting damper mounting cavity by the first bolt and the second bolt, respectively. The upper and lower ends of the disc spring reset device are connected to the column base flange plate and the wall foot connecting plate by hinge joints, respectively. A trapezoidal stiffening rib is installed on the top of the column base flange plate directly above the disc spring reset device. The trapezoidal stiffening rib is welded to the column base flange plate and the concealed column in the bottom wall, respectively.

3. The self-resetting concealed frame-cold-formed steel composite wall as described in claim 1 or 2, characterized in that, The disc spring reset devices are arranged on both sides of the replaceable soft steel damper along the wall thickness direction, so that the replaceable soft steel damper and the disc spring reset device are connected in parallel to form a self-resetting damper.

4. The self-resetting concealed frame-cold-formed steel composite wall as described in claim 3, characterized in that, The self-resetting damper installation cavity reserved between the column base flange plate and the wall foot connection plate is determined according to the area of ​​failure at the foot of the cold-formed steel shear wall with the hidden column-steel beam flange connection under seismic load. According to the actual load conditions, the self-resetting damper installation cavity is further extended into the bottom wall. At this time, two or more soft steel dampers can be replaced in parallel and matched with the corresponding disc spring reset device.

5. The self-resetting concealed frame-cold-formed steel composite wall as described in claim 1 or 2, characterized in that, The replaceable soft steel damper includes a bottom connecting plate, a top connecting plate, a fixed plate, damper stiffening ribs, a wall base force transmission component, and a variable cross-section stiffening steel plate. The specific structure is as follows: A wall base force transmission component with an I-shaped cross-section is vertically welded to the bottom of the horizontal top connecting plate. Fixed plates and damper stiffening ribs are vertically welded to the tops of two horizontally opposite bottom connecting plates, respectively. One set of fixed plates on each bottom connecting plate is vertically welded to the damper stiffening ribs. The two sets of fixed plates and damper stiffening ribs are symmetrical, with the fixed plates located on the inner side and the damper stiffening ribs on the outer side. The wall base force transmission component is welded to the corresponding fixed plate via a variable cross-section stiffening steel plate. The top connecting plate and the wall base force transmission component are welded to form component two. The bottom connecting plate, fixed plate, and damper stiffening ribs are welded to form component one. Component one (A), component two (B), and the variable cross-section stiffening steel plate are welded to form the overall structure.

6. The self-resetting concealed frame-cold-formed steel composite wall as described in claim 5, characterized in that, The stiffening ribs of the damper are optimized in size according to the actual horizontal load on the wall base, and their width is at least 1 / 5 or more of the entire replaceable soft steel damper.

7. The self-resetting concealed frame-cold-formed steel composite wall as described in claim 5, characterized in that, The load-bearing capacity of the replaceable soft steel damper is basically equal to or slightly less than that of the wall base being replaced.

8. The self-resetting concealed frame-cold-formed steel composite wall as described in claim 5, characterized in that, Variable cross-section stiffening steel plates are prefabricated using low yield point steel, and the strength of the variable cross-section stiffening steel plates is adaptively lower as they approach the center of the wall. Parallel replaceable soft steel dampers are set with two or more strength gradients. The variable cross-section stiffening steel plates are arranged at equal intervals along the height of the wall, with a thickness of at least 6mm or more. Different sizes, strengths and quantities of variable cross-section stiffening steel plates are used as needed.

9. The self-resetting concealed frame-cold-formed steel composite wall as described in claim 8, characterized in that, The strength of component A, component B, column base flange plate, and wall foot connection plate is higher than that of the variable cross-section stiffening steel plate, and the thickness is more than twice that of the variable cross-section stiffening steel plate, ensuring that the main destructive and energy-consuming components of the replaceable soft steel damper are concentrated only in the variable cross-section stiffening steel plate.

10. The self-resetting concealed frame-cold-formed steel composite wall as described in claim 1, 2, or 3, characterized in that, The disc spring reset device includes a hinge joint, an outer sleeve, a disc spring, an inner rod, and baffles. The specific structure is as follows: the inner rod is inserted into the outer sleeve, and the vertically arranged disc springs are installed between the two baffles on the inner rod as self-resetting components. The disc springs can be arranged in a stacked, paired, or combined manner. The lower end of the outer sleeve and the upper end of the inner rod are respectively provided with hinge joints corresponding to the column base flange plate and the wall foot connecting plate.

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