An energy-dissipating steel plate shear wall based on SMA self-stressing tendons

Abstract

This invention relates to an energy-dissipating steel plate shear wall based on SMA self-stressing tendons, comprising structural columns, boundary beams, flat steel plates, bow-shaped transverse corrugated steel plates, bow-shaped vertical corrugated steel plates, and corner reinforcements; two structural columns and two boundary beams form the frame structure of the shear wall; the flat steel plates are located within the frame structure; bow-shaped vertical corrugated steel plates are arranged between the concave edges of the structural columns and the flat steel plates, and bow-shaped transverse corrugated steel plates are arranged between the concave edges of the boundary beams and the flat steel plates; corner reinforcements are provided at the adjacent ends of the bow-shaped vertical corrugated steel plates and the bow-shaped transverse corrugated steel plates. This invention has a simple structure; the SMA self-stressing tendons generate prestress due to their own crystalline structure phase transformation, making construction convenient; the overall shear wall has good energy dissipation performance; and the self-resetting ability can effectively reduce the cost of post-earthquake repair or reinforcement.

Description

Technical Field

[0001] This invention relates to the field of industrialized steel structures, specifically to an energy-dissipating steel plate shear wall based on SMA self-stressing tendons. Background Technology

[0002] Prefabricated steel plate shear walls, as a type of lateral force resisting component in high-rise structures, possess advantages such as high stiffness, good ductility, and stable hysteretic characteristics, making them highly suitable for use in high-rise structures in earthquake-prone areas. Traditional flat steel plate shear walls suffer from low out-of-plane stiffness, potentially leading to buckling under normal service conditions and failing to meet seismic requirements. To address this, horizontally corrugated steel plate shear walls or horizontally rib-reinforced flat steel plate shear walls are employed. In some cases, vertically corrugated steel plates or vertically rib-reinforced flat steel plate shear walls are used to allow the steel plate shear walls to withstand appropriate vertical loads. However, these reinforcements can affect the buckling pressure wave of the steel plate shear wall, reducing its seismic adaptability. Traditional steel plate shear wall structures also exhibit significant residual deformation, making post-earthquake repair difficult. Therefore, addressing these issues and improving the seismic energy dissipation and self-recovery capabilities of steel plate shear walls is a pressing technical challenge that needs to be solved.

[0003] Shape memory alloys (SMAs) possess properties such as shape memory effect, high damping performance, superelasticity, and good fatigue resistance. SMA self-stressing tendons can generate restoring stress within a constrained SMA through heating excitation. This restoring stress is equivalent to the prestress, or self-stress, applied by the SMA to the constrained body, and can achieve various deformation forms. They are easily combined with materials such as concrete and steel, leading to their rapid development in the field of seismic isolation and seismic resistance in civil engineering. This invention introduces SMA self-stressing tendons to apply pre-tension stress to the intermediate flat steel plate, improving the elastic buckling bearing capacity of the wall panel without affecting the generation of different buckling pressure waves in the steel plate shear wall according to the intensity of the earthquake, thus achieving seismic energy dissipation. Simultaneously, the SMA self-stressing tendons and the horizontal and vertical corrugated plates form elastic supports, improving the stability of the columns and the deformation recoverability of the beams. The SMA self-stressing tendons themselves also have good self-resetting and energy dissipation capabilities. Therefore, the overall shear wall structure has stronger deformation self-recovery and energy dissipation capabilities, resulting in better seismic performance. This invention has a simple structure. The SMA self-stressing tendons generate prestress due to the phase transformation of their own crystal structure, making construction convenient. The overall shear wall has good energy dissipation performance, and the self-resetting ability can also effectively reduce the cost of structural repair or reinforcement after an earthquake. Summary of the Invention

[0004] The purpose of this invention is to solve the technical problems of existing steel plate shear wall structures having weak energy dissipation and deformation recovery capabilities, which prevent them from effectively exerting their seismic resistance and making them unsuitable for high-rise buildings and seismic fortification areas. Therefore, this invention proposes an energy-dissipating steel plate shear wall based on SMA self-stressing tendons.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] An energy-dissipating steel plate shear wall based on SMA self-stressing tendons includes structural columns, boundary beams, flat steel plates, bow-shaped transverse corrugated steel plates, bow-shaped vertical corrugated steel plates, and corner reinforcements;

[0007] The structural columns are arranged vertically, and the boundary beams are arranged horizontally. The two structural columns and two boundary beams form a frame structure with shear walls.

[0008] The flat steel plate is located within the frame structure and is a rectangular structure with four concave sides;

[0009] An arc-shaped vertical corrugated steel plate is provided between the structural column and the concave edge of the flat steel plate, and an arc-shaped transverse corrugated steel plate is provided between the boundary beam and the concave edge of the flat steel plate.

[0010] Corner reinforcements are provided at the flat steel plate positions at the adjacent ends of the bow-shaped vertical corrugated steel plate and the bow-shaped horizontal corrugated steel plate.

[0011] As a further preferred option, the flat steel plate, the bow-shaped transverse corrugated steel plate, and the bow-shaped vertical corrugated steel plate are arranged on the same plane.

[0012] As a further preferred option, SMA self-stressing tendons are arranged between the flat steel plate and the bow-shaped transverse corrugated steel plate and the bow-shaped vertical corrugated steel plate, respectively. The connection method between the flat steel plate and the SMA self-stressing tendons is based on the connection between the edge of the membrane surface and the edge of the supporting structure in membrane structures.

[0013] As a further preferred option, SMA self-stressing tendons are made of iron-based shape memory alloy material. Shape memory alloy material is a special alloy material composed of two crystal structures: martensite and austenite. These two crystal structures can transform into each other under temperature excitation, macroscopically manifesting as a change in the shape of the SMA. This shape recovery phenomenon caused by the crystal structure phase transformation is called the shape memory effect. Utilizing this material characteristic of the SMA self-stressing tendons, restoring stress can be generated in the SMA and applied as prestress to the flat steel plate. Under seismic loading, the combined action of the SMA self-stressing tendons and the flat steel plate can increase the lateral stiffness of the steel plate shear wall and also improve the elastic buckling bearing capacity of the shear wall. SMA self-stressing tendons also possess high damping and large recoverable deformation properties. Under seismic loading, the addition of SMA self-stressing tendons can enhance the energy dissipation capacity of the shear wall, reduce structural deformation, and achieve self-resetting.

[0014] As a further preferred option, the four corners of the flat steel plate correspond one-to-one with the four corners of the flat steel plate frame structure.

[0015] Compared with the prior art, the technical advantages of the present invention are as follows:

[0016] 1) The energy-dissipating steel plate shear wall based on SMA self-stressing tendons shown in this invention utilizes the shape memory effect and high elasticity of iron-based shape memory alloy materials to generate restoring stress, which is then applied as prestress to the steel plate to improve the elastic buckling bearing capacity of the plate. It also utilizes the high damping property of SMA self-stressing tendons to play a strong role in dissipating energy during earthquakes, thereby improving the ductility of the shear wall. In addition, there is little or no residual deformation after an earthquake, achieving a self-resetting effect, which can compensate for the disadvantage of steel plate walls being difficult to recover after an earthquake.

[0017] 2) The invention has a simple structure and is easy to construct. The self-prestressing technology based on SMA self-stressing tendons does not require on-site tensioning. It only requires heating to induce a phase transformation in the material, thereby generating recovery stress as prestress.

[0018] 3) The combination of SMA self-stressing tendons and corrugated steel plates in this invention can also be used as supports, improving the stability of columns and the recoverability of beams.

[0019] 4) In this invention, the SMA self-stressing tendon is made of iron-based shape memory alloy material, which is cheaper than nickel-titanium-based shape memory alloys, highlighting its economic advantages; compared with copper-based shape memory alloys, it has a higher elastic modulus and can undergo phase transformation at relatively low temperatures. The SMA self-stressing tendon also has good corrosion resistance, which can improve the durability of steel plate shear walls. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of the energy-dissipating steel plate shear wall based on SMA self-stressing tendons, which is involved in this invention.

[0021] Figure 2 This is a cross-sectional view of the energy-dissipating steel plate shear wall based on SMA self-stressing tendons involved in the present invention;

[0022] Figure 3 This is an exploded view of the present invention;

[0023] In the diagram: 1-Structural column, 2-Boundary beam, 3-Flat steel plate, 4-Trapezoidal transverse corrugated steel plate, 5-Trapezoidal vertical corrugated steel plate, 6-SMA self-stressing tendon, 7-Corner reinforcement. Detailed Implementation

[0024] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0025] like Figure 1As shown, an energy-dissipating steel plate shear wall based on SMA self-stressing tendons is characterized by: two structural columns 1, two steel beams 2 arranged in parallel between the two structural columns, a flat steel plate 3 arranged between the steel beams, SMA self-stressing tendons 6 arranged around the flat steel plate 3, the connection method between the flat steel plate and the SMA self-stressing tendons is similar to the connection between the edge of the membrane surface and the edge of the supporting structure in membrane structures, corner reinforcements 7 are provided at the four corners of the flat steel plate 3, an arc-shaped vertical corrugated steel plate 5 is arranged between the flat steel plate and the frame column, and a trapezoidal arc-shaped corrugated steel plate 4 is arranged between the flat plate and the frame beam.

[0026] SMA self-stressing tendon 6 is made of iron-based shape memory alloy material, which has shape memory effect and high elasticity. It can generate restoring force and can be applied as prestress to steel plate. There is no need to apply prestress through equipment tensioning during construction. The restoring stress is generated by heating SMA to apply prestress to the central flat steel plate.

[0027] The self-stressing tendons of the SMA (Self-Stressing Mud) apply prestress to the central flat steel plate. During an earthquake, the shear wall is subjected to alternating diagonal tension and diagonal compression under horizontal loads. The prestress applied by the SMA to the steel plate can offset part of the compressive stress, increasing the elastic buckling bearing capacity of the shear wall, delaying out-of-plane buckling of the steel plate wall, and thus increasing the lateral force resistance of the shear wall.

[0028] Flat steel plate 3 is arranged in the same plane with trapezoidal transverse corrugated steel plate 4 and trapezoidal vertical corrugated steel plate 5. SMA self-stressing tendons apply prestress to the corrugated steel plates and form elastic support with the corrugated steel plates, providing lateral support for the compression column. SMA self-stressing tendons can form a tensioned beam structure with the beam, which can improve the stability of the column and enhance the deformation recovery of the beam.

[0029] First, the flat steel plate 3 and the SMA self-stressing tendons around it are constructed. Then, by heating, the SMA self-stressing tendons 6 apply prestress to the flat steel plate. The four corners of the steel plate correspond to the four corners of the frame and are installed into the steel frame. The corrugated steel plate has a large out-of-plane stiffness and good energy dissipation performance.

[0030] Next, the trapezoidal horizontal corrugated steel plate 4 and the trapezoidal vertical corrugated steel plate 5 are installed into the opening between the flat steel plate and the steel frame. The corrugated steel plate is a passive load-bearing component and can form an elastic support with the SMA self-stressing tendon.

[0031] Finally, corner reinforcements were added to the four corners of the flat steel plate to protect the corners.

[0032] In an energy-dissipating steel plate shear wall based on SMA self-stressing tendons, under seismic loading, structural column 1 transfers the horizontal force to the SMA self-stressing tendons 6 through the corrugated steel plate. The pre-tension stress applied by the SMA self-stressing tendons 6 to the steel plate 3 can resist part of the compressive stress generated within the steel plate due to seismic loading. The SMA self-stressing tendons 6 and the internal flat steel plate 3 deform together to dissipate energy. When the horizontal force reverses, the SMA self-stressing tendons return to their pre-stressed state and deform in the opposite direction. At this time, the stress in the steel plate also reverses, and part of the compressive stress can be offset by the pre-tension stress applied by the SMA self-stressing tendons. Under seismic loading, the SMA self-stressing tendons and the steel plate work together, resulting in lower compressive stress in the steel plate shear wall and making it less prone to out-of-plane buckling, thereby improving the elastic buckling bearing capacity of the shear wall. After the seismic loading disappears, the superelastic effect of the shape memory alloy tendons allows the structural system to return to its initial state with no residual deformation or very small residual deformation, achieving a high energy dissipation and self-resetting effect.

[0033] In this invention, by introducing SMA self-stressing tendons to apply prestress to the intermediate flat steel plate, the elastic buckling bearing capacity of the wall panel is improved without affecting the generation of different buckling pressure waves in the steel plate shear wall according to the intensity of the earthquake, thus achieving seismic energy dissipation. Simultaneously, the SMA self-stressing tendons, together with the horizontal and vertical corrugated plates, form elastic supports, improving the stability of the columns and the deformation recoverability of the beams. The SMA self-stressing tendons themselves also have good self-resetting and energy dissipation capabilities. Therefore, the overall shear wall structure has stronger deformation self-recovery and energy dissipation capabilities, resulting in good seismic performance. This invention has a simple structure; the SMA self-stressing tendons generate prestress due to their own crystal structure phase transformation, making construction convenient. The overall shear wall has good energy dissipation performance, and the self-resetting capability can effectively reduce the cost of post-earthquake repair or reinforcement.

[0034] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. An energy-dissipating steel plate shear wall based on SMA self-stressing tendons, characterized in that: Includes structural columns (1), boundary beams (2), flat steel plates (3), bow-shaped transverse corrugated steel plates (4), bow-shaped vertical corrugated steel plates (5), and corner reinforcements (7); The structural columns (1) are arranged vertically, and the boundary beams (2) are arranged horizontally. The two structural columns (1) and the two boundary beams (2) form a frame structure of shear walls. The flat steel plate (3) is located inside the frame structure, and the flat steel plate (3) is a rectangular structure with concave sides. An arc-shaped vertical corrugated steel plate (5) is provided between the concave edge of the structural column (1) and the flat steel plate (3), and an arc-shaped transverse corrugated steel plate (4) is provided between the concave edge of the boundary beam (2) and the flat steel plate (3). The bow-shaped vertical corrugated steel plate (5) and the bow-shaped horizontal corrugated steel plate (4) are provided with corner reinforcements (7) at the flat steel plate (3) at the adjacent ends. SMA self-stressing tendons (6) are arranged between the flat steel plate (3) and the bow-shaped transverse corrugated steel plate (4) and the bow-shaped vertical corrugated steel plate (5), respectively. The recovery stress generated by the phase transformation of the crystal structure of the SMA self-stressing tendon (6) can be applied to the flat steel plate (3) as prestress.

2. The energy-dissipating steel plate shear wall based on SMA self-stressing tendons according to claim 1, characterized in that: The flat steel plate (3), the bow-shaped transverse corrugated steel plate (4), and the bow-shaped vertical corrugated steel plate (5) are arranged on the same plane.

3. The energy-dissipating steel plate shear wall based on SMA self-stressing tendons according to claim 1, characterized in that: The SMA self-stressing tendon (6) is made of iron-based shape memory alloy material.

4. The energy-dissipating steel plate shear wall based on SMA self-stressing tendons according to claim 1, characterized in that: The four corners of the flat steel plate (3) correspond one-to-one with the four corners of the flat steel plate (3) frame structure.

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