Partially externally-wrapped regenerated foam concrete combined column bundle shear wall

Abstract

The invention relates to the technical field of fabricated steel-concrete combined anti-seismic structures, in particular to a partially externally-wrapped regenerated foam concrete combined column bundle shear wall, and each PEC-RFC column is composed of a cold-formed thin-walled steel plate with a longitudinal corrugated groove and regenerated foam concrete filled in the groove. The PEC-RFC columns are continuously arranged side by side in the width direction of the wall body to form the PEC-RFC column bundle wall body. According to the column bundle wall, through the combined action of the longitudinal corrugated steel plates and the core concrete, continuous stress transmission and hysteretic collaborative energy consumption are achieved, and the overall rigidity and ductility are improved. The wall modules are designed by adopting detachable bolt joints which are prefabricated in factories and assembled on site, damaged modules can be rapidly replaced after an earthquake so as to recover the structure function, and efficient post-earthquake repairability and function recovery capacity are achieved. The used regenerated foam concrete has the properties of light weight, energy absorption, heat preservation and sound insulation, so that the enclosure performance is improved, and the resource utilization of building solid wastes can be realized.

Description

Technical Field

[0001] This invention relates to the field of prefabricated steel-concrete composite seismic-resistant structure technology, specifically a composite column shear wall with partially externally wrapped recycled foam concrete. Background Technology

[0002] Corrugated steel plate shear walls are widely used due to their light weight, high lateral stiffness, and convenient construction. However, the traditional system has the following shortcomings: cold-formed thin-walled steel plates with longitudinal corrugated grooves are prone to local buckling of the web after being subjected to stress, resulting in a decrease in hysteretic energy dissipation capacity and weakening the overall seismic performance; the thermal insulation and sound insulation performance of thin steel plate enclosure components is poor, making it difficult to meet the requirements of living comfort; post-earthquake repair costs are high, construction cycles are long, and often require complete replacement, resulting in resource waste and increased carbon emissions, which is not conducive to achieving resilient cities and "dual carbon" goals.

[0003] To address these issues, researchers have proposed various improved shear walls, such as concrete-filled steel plate walls, composite shear walls, and buckling-restrained steel plate walls. While these structures improve buckling resistance and energy dissipation to some extent, the concrete and steel plates do not form an effective composite section, their synergistic effect is unstable, construction is complex, and repair is inconvenient. A comprehensive solution that combines structural performance, assembly efficiency, and sustainability has not yet been achieved. Summary of the Invention

[0004] The purpose of this invention is to provide a partially externally wrapped recycled foamed concrete composite column shear wall to solve the problems mentioned in the background art.

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

[0006] A partially externally encased recycled foamed concrete composite column shear wall includes:

[0007] Cold-formed thin-walled steel sheet, wherein longitudinal corrugated grooves are machined on the cold-formed thin-walled steel sheet;

[0008] Recycled foamed concrete is filled into the longitudinal corrugated grooves processed on the cold-formed thin-walled steel plate to form several partially wrapped recycled foamed concrete composite columns arranged side by side along the width of the wall. The several parallel PEC-RFC columns form a PEC-RFC column bundle.

[0009] Several tie strips are welded and fixed to the outer surface of the PEC-RFC column bundle in parallel along the height direction of the wall to enhance the restraining effect of the cold-formed thin-walled steel plate on the recycled foam concrete and improve the overall load-bearing performance of the wall.

[0010] The steel frame is a rectangular closed structure formed by welding flat steel plates. The steel frame is welded and fixed around the PEC-RFC column bundle to constrain the boundary of the cold-formed thin-walled steel plate and provide a hoisting and assembly interface.

[0011] As a preferred embodiment of the above technical solution, the thickness of the cold-formed thin-walled steel plate is 1.5 to 5.0 mm, the ratio of the wave height of the longitudinal corrugated groove to the thickness of the cold-formed thin-walled steel plate is 40 to 80:1, the wave pitch of the longitudinal corrugated groove is 150 to 400 mm, and the included angle of the longitudinal corrugated groove is 45° to 90°, so as to take into account the buckling stability, overall stiffness and hysteretic energy dissipation performance of the shear wall.

[0012] As a preferred embodiment of the above technical solution, the lacing strip is a flat steel strip-shaped component with a thickness of 2 to 3 times that of the cold-formed thin-walled steel plate, and the spacing between adjacent lacing strips is 1 / 6 to 1 / 4 of the wall height.

[0013] This invention provides a partially externally wrapped recycled foamed concrete composite column shear wall, which has the following beneficial effects:

[0014] 1. By filling the longitudinal corrugated grooves of cold-formed thin-walled steel plates with recycled foamed concrete, a partially encased composite column with recycled foamed concrete (PEC-RFC column) is formed. Several PEC-RFC columns are arranged side by side and connected to the steel frame by tie bars to form a PEC-RFC column bundle shear wall unit. This structure utilizes both the tensile effect of the cold-formed thin-walled steel plate and the compressive restraint effect of the recycled foamed concrete, thereby improving the buckling stability, hysteretic energy dissipation capacity, and ductility of the shear wall unit, while also providing advantages in thermal insulation, sound insulation, and green recycling.

[0015] 2. Multiple PEC-RFC columns are continuously arranged along the width of the wall to form a PEC-RFC column bundle. They are interconnected and constrained by tie strips arranged along the height of the wall and a surrounding steel frame. The tie strips are closely attached to and welded to the outer surface of the cold-formed thin-walled steel plate, and both ends are welded to the steel frame to improve the bonding performance and synergistic working ability between the cold-formed thin-walled steel plate and the recycled foamed concrete. Adjacent PEC-RFC columns form an overall constraint system through the connection of tie strips and the frame. This ensures that the central PEC-RFC column is laterally constrained by the PEC-RFC columns on both sides during stress, thereby achieving continuity of stress transfer and uniform stress distribution, significantly improving the overall shear stiffness, buckling stability, and energy dissipation capacity of the wall.

[0016] 3. PEC-RFC column bundles can be standardized in the factory and formed into shear wall units by welding the lacing strips to the frame. They can be directly assembled after transportation, making construction simple and quality controllable. Recycled foamed concrete can utilize construction solid waste and industrial by-products to achieve resource recycling and structural lightweighting, meeting the requirements of energy conservation and carbon reduction. The shear wall units have a modular structure, which can realize the rapid disassembly or replacement of damaged components after an earthquake, shortening the structural function recovery cycle and reducing maintenance costs. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the partially encapsulated recycled foamed concrete composite column shear wall of the present invention.

[0018] Figure 2 This is a schematic diagram of the construction of a PEC-RFC column.

[0019] Figure 3 A schematic diagram of a PEC-RFC column bundle wall formed by filling the groove of a corrugated steel plate with recycled foamed concrete.

[0020] Figure 4 This is a schematic diagram of the PEC-RFC column bundle wall after the connecting strips are installed.

[0021] Figure 5 for Figure 4 Top view.

[0022] Figure 6 for Figure 4 Side view.

[0023] Figure 7 This is a construction flowchart for a partially outsourced recycled foamed concrete composite column shear wall.

[0024] Figure 8 This is a test loading diagram for a partially outsourced recycled foamed concrete composite column shear wall.

[0025] Figure 9 Hysteresis performance curves for partially outsourced recycled foamed concrete composite column shear wall tests.

[0026] In the diagram: 1-Cold-formed thin-walled steel plate, 2-Recycled foamed concrete, 3-Flanging strip, 4-Steel frame. Detailed Implementation

[0027] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.

[0028] like Figure 1 As shown, the partially encased recycled foam concrete composite column bundle shear wall provided by the present invention consists of several PEC-RFC columns arranged in parallel along the width direction of the wall, several lacing strips 3 and steel frame 4.

[0029] like Figure 2 As shown, each PEC-RFC column consists of a longitudinal corrugated groove and recycled foamed concrete 2 filled within it. After solidification, the recycled foamed concrete 2 filling the groove forms a partially enclosed composite section with the longitudinal corrugated groove, allowing the cold-formed thin-walled steel plate 1 to exert its advantages in the tension zone and the recycled foamed concrete 2 to bear the pressure in the compression zone, thereby achieving synergistic stress distribution.

[0030] like Figure 3 As shown, the preparation steps of the PEC-RFC column bundle are as follows: First, cold-formed thin-walled steel plate 1 is processed according to the design dimensions and longitudinal corrugated grooves are formed; the cold-formed thin-walled steel plate 1 is assembled or spot-welded with the steel frame 4 to form a modular boundary; then the module is placed horizontally or fixed according to the process requirements, and recycled foamed concrete 2 is poured into one side of the longitudinal corrugated groove. After the concrete on that side has initially set or reached a certain strength, it is poured into the other side of the longitudinal corrugated groove until both grooves are filled; after curing to the design strength, a complete PEC-RFC column bundle is formed.

[0031] like Figures 4-6 As shown, several PEC-RFC columns are arranged side by side and connected and constrained by lacing strips 3 arranged at equal intervals along the height direction and the surrounding steel frame 4. The lacing strips 3 are flat steel strips or L-shaped steel, which are closely attached to and welded to the outer surface of the cold-formed thin-walled steel plate 1, and welded to the steel frame 4 at both ends, serving to reinforce the interface and transmit shear force. The steel frame 4 is a rectangular closed ring welded from flat steel plates, used to constrain the boundary of the cold-formed thin-walled steel plate 1 and provide an interface for hoisting, transportation and assembly.

[0032] like Figure 7 As shown, the fabrication process of the entire partially encased recycled foam concrete composite column shear wall is as follows: First, a cold-formed thin-walled steel plate 1 is embedded in a steel frame 4 and welded to it. The cold-formed thin-walled steel plate 1 and the steel frame 4 are welded to form a modular unit. Then, the module is placed horizontally, and recycled foam concrete 2 is poured into the longitudinal corrugated groove on one side of the cold-formed thin-walled steel plate 1. After solidification, it is poured into the longitudinal corrugated groove on the other side to form a stable filling on both sides. After the recycled foam concrete 2 is cured to the design strength, multiple PEC-RFC columns are formed continuously along the width of the wall. Then, the lacing strip 3 is arranged along the height of the wall and is placed close to the outer surface of the cold-formed thin-walled steel plate 1 and welded to it. Its end is welded to the steel frame 4. Finally, the partially encased recycled foam concrete composite column shear wall is formed by welding the lacing strip 3 to the steel frame 4.

[0033] To verify the stress performance and structural feasibility of the partially externally wrapped recycled foamed concrete composite column shear wall provided by this invention, a quasi-static test was conducted. Its structural form is similar to... Figures 1-6The results are consistent with those shown. The test loading employed a low-cycle reciprocating horizontal load, and the loading regime followed the "Standard for Seismic Testing Methods of Buildings" (JGJ / T 101). By measuring the hysteresis curves, skeleton curves, and stiffness degradation patterns, the hysteretic energy dissipation performance, ductility, and failure mode of the wall were analyzed. The test phenomena are as follows: Figure 8 As shown, the hysteresis curve is as follows Figure 9 As shown.

[0034] The experimental results show that the partially encased recycled foamed concrete composite column shear wall provided by this invention exhibits good linear elastic response and high peak bearing capacity in the initial loading stage. During buckling and cyclic loading, the cold-formed thin-walled steel plate 1 and the recycled foamed concrete 2 maintain good synergy, with a full overall hysteresis curve and no obvious brittle failure. The structure maintains a high residual bearing capacity after multiple cycles, demonstrating excellent hysteretic energy dissipation capacity and ductility. These results verify the rationality of the technical solution of this invention and its promising engineering application prospects.

[0035] The partially outsourced recycled foamed concrete composite column shear wall provided by this invention can be prefabricated into standard modules on a factory production line. After passing inspection and being numbered, the modules are transported to the site. On-site, the modules can be positioned using lifting equipment and connected to adjacent components or foundations by bolts or welding, with necessary sealing, fireproofing, and external finishing completed. If a module is damaged during use, it can be disassembled as a whole according to the assembly process and replaced with a new module. The disassembled steel and concrete debris can be reused or processed according to the resource recovery process. This system can serve as both a lateral force resisting component of a building and a composite wall with enclosure properties, making it suitable for prefabricated buildings and resilient urban construction.

[0036] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A partially externally wrapped recycled foamed concrete composite column shear wall, characterized in that, include: Cold-formed thin-walled steel plate (1), wherein longitudinal corrugated grooves are machined on the cold-formed thin-walled steel plate (1); Recycled foamed concrete (2) is filled into the longitudinal corrugated groove processed on the cold-formed thin-walled steel plate (1) to form a PEC-RFC column bundle composed of several PEC-RFC columns arranged side by side along the width of the wall. Several lacing strips (3) are welded and fixed to the outer surface of the PEC-RFC column bundle in parallel along the height direction of the wall to enhance the restraining effect of the cold-formed thin-walled steel plate (1) on the recycled foam concrete (2) and improve the overall stress performance of the wall. The steel frame (4) is a rectangular closed structure formed by welding flat steel plates. The steel frame (4) is welded and fixed around the PEC-RFC column bundle to constrain the boundary of the cold-formed thin-walled steel plate (1) and provide a hoisting and assembly interface.

2. The partially externally wrapped recycled foamed concrete composite column shear wall according to claim 1, characterized in that, The thickness of the cold-formed thin-walled steel plate (1) is 1.5 to 5.0 mm. The ratio of the wave height of the longitudinal corrugated groove to the thickness of the cold-formed thin-walled steel plate (1) is 40 to 80:

1. The wave pitch of the longitudinal corrugated groove is 150 to 400 mm. The included angle of the longitudinal corrugated groove is 45° to 90°, so as to take into account the buckling stability, overall stiffness and hysteretic energy dissipation performance of the shear wall.

3. The partially externally wrapped recycled foamed concrete composite column shear wall according to claim 1, characterized in that, The lacing strip (3) is a flat steel strip-shaped component with a thickness of 2 to 3 times that of the cold-formed thin-walled steel plate (1). The spacing between adjacent lacing strips (3) is 1 / 6 to 1 / 4 of the wall height.

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