Pre-pressing disc spring self-resetting variable friction reinforced concrete shear wall

Abstract

The invention discloses a pre-pressing disc spring self-resetting variable-friction reinforced concrete shear wall which comprises a reinforced concrete wall body part, an inverted triangular support for bearing the reinforced concrete wall body part and a self-resetting variable-friction energy consumption unit. Each self-resetting variable-friction energy dissipation unit comprises an axis tube, an outer groove, square steel and an axial belleville spring set, wherein a T-shaped connecting plate is welded to one end of the axis tube, the axis tube penetrates through the middle of the outer groove, a T-shaped connecting plate is welded to the lower end of the outer groove, the square steel is placed in the middle of the outer groove, a round hole is formed in a top steel plate of the square steel, and the axis tube penetrates through the middle of the axial belleville spring set. The axial belleville spring set is arranged on the square steel, the force bearing supporting plate is used for transmitting the pre-pressure of the axial belleville spring set, the connecting nut is used for locking the pre-pressure of the axial belleville spring set and connecting the square steel and the axis tube, the friction plate is clamped by the square steel and the steel plate on the side face of the outer groove, and the double-concave steel plate is arranged on the side face of the outer groove. And the lateral belleville spring group is arranged on the outer side surface of the double-concave steel plate.

Description

Technical Field

[0001] The invention relates to a pre-stressed disc spring self-resetting variable friction reinforced concrete shear wall technology, belonging to the field of civil engineering earthquake resistance. Background Art

[0002] When ordinary reinforced concrete shear walls are subjected to high-intensity earthquakes, they often suffer from irreversible structural damage, accumulated plastic deformation, and significant residual displacement. These damage characteristics not only increase the difficulty and cycle of post-disaster repair, but also lead to high repair costs. To address this technical bottleneck, the scientific research community has developed a variety of self-resetting shear walls in recent years to address such problems. However, there are still several key technical difficulties in practical applications: the inevitable loss of prestress in the prestressed reset system, the millimeter-level precision control requirements for component installation, and the fragility of energy-consuming components. In addition, existing self-resetting reinforced concrete shear wall structures still generally have the problem of insufficient energy dissipation capacity.

[0003] In terms of energy dissipation mechanisms and technical approaches for reset systems, current engineering practices primarily employ three types of energy dissipation devices: metal energy dissipators based on plastic deformation, interfacial friction dampers, and viscous fluid energy dissipators. Ductile metal devices often suffer from irreversible plastic damage after large deformations, while viscous dampers pose the risk of leakage due to seal failure. Regarding reset systems, prestressed steel strands, fiber-reinforced plastic (FRP) bars, butterfly spring assemblies, annular spring assemblies, and shape memory alloys (SMAs) are currently the primary components. However, prestressed steel strands have inherent drawbacks such as difficult-to-avoid relaxation effects and complex anchoring systems. FRP materials are limited by weak interfacial bonding and specialized construction techniques. While shape memory alloys offer the advantage of superelasticity, their high raw material costs hinder their large-scale application. While inexpensive, annular springs can easily become stuck, preventing reset. These technical challenges severely impact the engineering feasibility and economic viability of self-resetting shear walls, necessitating breakthroughs and innovations. Summary of the Invention

[0004] Purpose of the invention: In order to overcome the shortcomings of the prior art, the present invention provides a pre-stressed disc spring self-resetting variable friction reinforced concrete shear wall that has both stable and reliable reset capability and high energy consumption capability, and is easy to construct and low in price.

[0005] The technical solution adopted by the present invention is: a pre-stressed disc spring self-resetting variable friction reinforced concrete shear wall, comprising a reinforced concrete wall portion, a foundation, an inverted triangle support, a hinge support, a self-resetting variable friction energy dissipation unit and a pin shaft connector;

[0006] The inverted triangular support bears the reinforced concrete wall part. The inverted triangular support is connected to the foundation through a hinge support. The upper end of the self-centering variable friction energy dissipation unit is connected to the inverted triangular support through a pin connection member, and the lower end of the self-centering variable friction energy dissipation unit is connected to the foundation through a pin connection member;

[0007] The self-centering variable friction energy dissipation unit includes an axial pipe, a connecting nut, an axial disc spring group, an outer groove, a bearing plate, a square steel, a lateral disc spring group, a friction plate, and a double concave steel plate;

[0008] The T-shaped connecting plate at the upper end of the axial pipe is connected to the inverted triangular support through a pin connection member. The outer surface of the circular pipe section of the axial pipe is threaded, and the circular pipe section passes through the center of the axial disc spring group. The upper and lower ends of the axial disc spring group are provided with bearing plates for transmitting the pressure of the axial disc spring group and connecting nuts for locking the pre-pressure of the axial disc spring group; The lower part of the axial pipe is inserted into the square steel and fixed by connecting nuts on both sides of the top steel plate of the square steel;

[0009] The axial disc spring group and the square steel are arranged inside the outer groove. The axial pipe sequentially passes through the connecting nut at the top of the outer groove, the round hole of the bearing plate at the top of the outer groove, the center of the axial disc spring group, the round hole of the bearing plate in the middle of the outer groove, the connecting nut in the middle of the outer groove, the connecting nut on the top steel plate of the square steel, the round hole of the top steel plate of the square steel, and the connecting nut under the top steel plate of the square steel;

[0010] Convex steel plates are welded to both side plates of the outer groove and vertical grooves are opened. The double concave steel plate is attached to the convex steel plate, and the lateral disc spring group is arranged on the outer surface of the double concave steel plate. Two friction plates are clamped between the two side plates of the square steel and the two side plates of the outer groove. Round holes are opened in the side plates of the square steel, the friction plates, and the double concave steel plate. The positions of the round holes correspond to the positions of the vertical grooves and are penetrated by high-strength bolts for connection; The lower end of the outer groove is connected to the foundation through a pin connection member.

[0011] Furthermore, the present invention adjusts the pre-pressure of the axial disc spring group by adjusting the distance between the two connecting nuts at the top and in the middle of the outer groove.

[0012] Furthermore, the present invention adjusts the second stiffness of the self-centering variable friction energy dissipation unit by adjusting the size and number of disc springs in the axial disc spring group; adjusts the displacement interval corresponding to the second stiffness by adjusting the gap width between the double concave steel plate and the convex steel plate on the side of the outer groove; adjusts the third stiffness of the self-centering variable friction energy dissipation unit by adjusting the size and number of disc springs in the lateral disc spring group or the convex and concave shapes of the double concave steel plate and the convex steel plate on the side of the outer groove.

[0013] Furthermore, in the present invention, the frictional force is adjusted by regulating the pre-tightening force of the high-strength bolts connecting the square steel, friction plate, outer groove, double-concave steel plate, and lateral disc spring group, and the seismic energy is dissipated through sliding friction.

[0014] Furthermore, in the present invention, the bottom longitudinal reinforcement of the reinforced concrete wall part is welded to the upper flange of the I-shaped stiffening steel beam at the top of the inverted triangular support.

[0015] Furthermore, in the present invention, the middle part of the hinge support is a concave steel bearing platform, and the round head at the lower end of the inverted triangular support is closely fitted to the concave of the concave steel bearing platform.

[0016] Beneficial effects: Compared with the existing self-centering reinforced concrete shear walls, the present invention has higher energy dissipation capacity and stable self-centering ability. The pre-compressed disc spring self-centering variable friction reinforced concrete shear wall uses a disc spring group to provide the self-centering force. By compressing the axial disc spring group to the designed pre-pressure and tightening the two connecting nuts located at the top and middle of the outer groove to lock the pre-pressure of the axial disc spring group, the second stiffness of the self-centering shear wall is adjusted by regulating the size and quantity of the disc springs in the axial disc spring group. The displacement interval corresponding to the second stiffness is adjusted by regulating the gap width between the double-concave steel plate and the convex steel plate on the side of the outer groove. The third stiffness of the self-centering variable friction energy dissipation unit is adjusted by regulating the size and number of the disc springs in the lateral disc spring group or the concave-convex shape between the double-concave steel plate and the convex steel plate on the side of the outer groove. Using the pre-compressed disc spring group as the self-centering element is more stable and convenient for construction than using steel strands, FRP bars, and annular springs, and has a lower cost than using shape memory alloys. This self-centering shear wall dissipates seismic energy through the sliding friction between the friction plate and the steel plate, and there is no need to replace the energy dissipation element after the earthquake. Description of the Drawings

[0017] Figure 1 Schematic diagram of the reinforced concrete wall part of the present invention;

[0018] Figure 2 Schematic diagram of the inverted triangular support of the present invention;

[0019] Figure 3 Schematic diagram of the hinge support of the present invention;

[0020] Figure 4 Schematic diagram of the pin connection member of the present invention;

[0021] Figure 5 Schematic diagram of the axial pipe of the present invention;

[0022] Figure 6 Schematic diagram of the connecting nut of the present invention;

[0023] Figure 7 Schematic diagram of the axial disc spring group of the present invention;

[0024] Figure 8 Schematic diagram of the outer groove of the present invention;

[0025] Figure 9 Schematic diagram of the load-bearing support plate of the present invention;

[0026] Figure 10 Schematic diagram of the square steel of the present invention;

[0027] Figure 11 Schematic diagram of the lateral disc spring group of the present invention;

[0028] Figure 12 Schematic diagram of the friction plate of the present invention;

[0029] Figure 13 Schematic diagram of the double concave steel plate of the present invention;

[0030] Figure 14 Schematic diagram of the preloaded disc spring self-resetting variable friction reinforced concrete shear wall structure of the present invention;

[0031] Figure 15 Schematic diagram of the self-resetting variable friction energy dissipation unit structure of the present invention;

[0032] Figure 16 Schematic sectional view of the self-resetting variable friction energy dissipation unit of the present invention;

[0033] In the drawings: 1 - Reinforced concrete wall part, 2 - Inverted triangular support, 3 - Hinge support, 4 - Pin shaft connecting piece, 5 - Axial pipe, 6 - Connecting nut, 7 - Axial disc spring group, 8 - Outer groove, 9 - Load-bearing support plate, 10 - Square steel, 11 - Lateral disc spring group, 12 - Friction plate, 13 - Double concave steel plate. Detailed implementation manners

[0034] The present invention will be further described below in conjunction with the drawings and detailed implementation manners.

[0035] As Figure 1-16As shown in the figure, a preloaded disc spring self-resetting variable friction reinforced concrete shear wall includes a reinforced concrete wall part 1, an inverted triangular support 2 supporting the reinforced concrete wall part 1, a hinge support 3 connecting the bottom of the inverted triangular support and the foundation, and a self-resetting variable friction energy dissipation unit with both ends connected to the I-shaped reinforced steel beam at the top of the inverted triangular support 2 and the foundation respectively by pin connectors 4. The self-resetting variable friction energy dissipation unit includes a central tube 5 welded with a T-shaped connecting plate at the upper end, an outer groove 8 penetrated through the middle by the central tube 5 and welded with a connecting support plate at the lower end, a square steel 10 placed in the outer groove 8, an axial disc spring group 7 arranged in the middle of the outer groove 8 and penetrated through the middle by the central tube 5, a bearing support plate 9 for transmitting the pre-pressure of the axial disc spring group, a connecting nut 6 for locking the pre-pressure of the axial disc spring group 7 and connecting the square steel 10 and the central tube 7, a friction plate 12 clamped by the square steel 10 and the steel plate on the side of the outer groove 8, a double concave steel plate 13 attached to the convex plate on the side of the outer groove 8, a lateral disc spring group 11 arranged on the outer surface of the double concave steel plate 13, and high-strength bolts connecting the steel plate on the side of the square steel, the friction plate, the outer groove, the double concave steel plate, and the lateral disc spring group in sequence; the central tube 5 sequentially passes through the connecting nut 6 located at the top of the outer groove 5, the round hole of the bearing support plate 9 located at the top of the outer groove 8, the center of the axial disc spring group 7, the round hole of the bearing support plate 9 located in the middle of the outer groove 8, the connecting nut 6 located in the middle of the outer groove 8, the connecting nut 6 located on the upper steel plate of the square steel 10, the center of the upper steel plate of the square steel 10, and the connecting nut 6 located under the upper steel plate of the square steel 10.

[0036] The preloaded disc spring self-resetting variable friction reinforced concrete shear wall of the present invention is installed and used in the following manner:

[0037] 1. Pass the central tube 5 sequentially through the connecting nut 6, the bearing support plate 9, the center of the axial disc spring group 7, the second bearing support plate 9, and the second connecting nut 6. Then fix the second bearing support plate 9, tension the central tube 5 to the designed pre-pressure of the axial disc spring group 7, and then tighten the second connecting nut 6 to lock the pre-pressure of the axial disc spring group 7.

[0038] 2. Pass the central tube 5 through the connecting nut 6 on the upper steel plate of the square steel 10, the round hole of the upper steel plate of the square steel 10, and the connecting nut 6 located under the upper steel plate of the square steel 10.

[0039] 3. Place the assembled components into the outer groove 8. Place the friction plate 12 between the steel plates on the side of the outer groove 8 and the steel plates on the side of the square steel 11. Fit the double concave steel plate 13 to the convex plate on the side of the outer groove 8 and arrange the lateral disc spring group on the outer side of the double concave steel plate 13. Pass the high-strength bolts through the round holes in the side steel plates of the square steel 10, the round holes in the friction plate 12, the hole grooves in the side steel plates of the outer groove 8, the round holes in the double concave steel plate 13, and the center of the lateral disc spring group in sequence. Then, tighten the connecting nuts 6 above and below the top steel plate of the square steel 10 to connect the axial pipe 5 and the square steel pipe 10. Then, according to the magnitude of the initial friction force, tighten the high-strength bolts to the specified torque. Thus, the assembly of the self-centering variable friction energy dissipation unit is completed.

[0040] 4. Connect the hinge support 3 and the foundation with high-strength bolts. Then, place the round head at the lower end of the inverted triangular support 2 into the concave bearing platform in the middle of the hinge support to connect the inverted triangular support 2 and the hinge support 3.

[0041] 5. Connect the two pin connectors 4 to the upper and lower ends of the self-centering variable friction energy dissipation unit respectively. Then, connect the pin connector 4 at the lower end of the self-centering variable friction energy dissipation unit to the foundation with high-strength bolts, and connect the pin connector 4 at the upper end of the self-centering variable friction energy dissipation unit to the I-shaped reinforced steel beam at the upper end of the inverted triangular support 2 with high-strength bolts.

[0042] 6. Bind the steel reinforcement cage of the reinforced concrete wall part 1 of the self-centering variable friction reinforced concrete shear wall, and weld the longitudinal steel bars of the steel reinforcement cage to the upper flange of the I-shaped reinforced steel beam at the top of the inverted triangular support 2. Then, formwork and pour the concrete of the reinforced concrete wall part 1.

[0043] The above is only the preferred embodiment of the present invention. The protection scope of the present invention is not limited to the above embodiments. All technical solutions falling within the idea of the present invention belong to the protection scope of the present invention. It should be noted that for those of ordinary skill in the art in this technical field, several improvements and refinements made without departing from the principle of the present invention should be regarded as within the protection scope of the present invention.

Claims

1. A pre-compressed disc spring self-resetting variable friction reinforced concrete shear wall, characterized in that It includes a reinforced concrete wall part (1), a foundation, an inverted triangular support (2), a hinge support (3), a self - resetting variable - friction energy - dissipation unit, and a pin - shaft connecting piece (4); The inverted triangular support (2) supports the reinforced concrete wall part (1). The inverted triangular support (2) is connected to the foundation through the hinge support (3). The upper end of the self - resetting variable - friction energy - dissipation unit is connected to the inverted triangular support (2) through the pin - shaft connecting piece (4), and the lower end of the self - resetting variable - friction energy - dissipation unit is connected to the foundation through the pin - shaft connecting piece (4); The self - resetting variable - friction energy - dissipation unit includes a central pipe (5), a connecting nut (6), an axial disc - spring group (7), an outer groove (8), a load - bearing support plate (9), a square steel (10), a lateral disc - spring group (11), a friction plate (12), and a double - concave steel plate (13); The T - shaped connecting plate at the upper end of the central pipe (5) is connected to the inverted triangular support (2) through the pin - shaft connecting piece (4). The outer surface of the circular pipe section of the central pipe (5) is threaded, and the circular pipe section passes through the center of the axial disc - spring group (7). The two ends of the axial disc - spring group (7) are provided with a load - bearing support plate (9) for transmitting the pressure of the axial disc - spring group (7) and a connecting nut (6) for locking the pre - pressure of the axial disc - spring group (7). The lower part of the central pipe (5) is inserted into the square steel (10) and fixed by two connecting nuts (6) on the upper and lower sides of the top steel plate of the square steel (10); The axial disc - spring group (7) and the square steel (10) are arranged inside the outer groove (8). The central pipe (7) sequentially passes through the connecting nut (6) at the top of the outer groove (8), the circular hole of the load - bearing support plate (9) at the top of the outer groove (8), the center of the axial disc - spring group (7), the circular hole of the load - bearing support plate (9) in the middle of the outer groove (8), the connecting nut (6) in the middle of the outer groove (8), the connecting nut (6) on the upper surface of the top steel plate of the square steel (10), the circular hole of the top steel plate of the square steel (10), and the connecting nut (6) on the lower surface of the top steel plate of the square steel (10); Two convex steel plates are welded to the two side steel plates of the outer groove (8) and are provided with vertical slots. The double - concave steel plate (13) is attached to the convex steel plate, and the lateral disc - spring group (11) is arranged on the outer surface of the double - concave steel plate. Two friction plates (12) are clamped between the two side steel plates of the square steel (10) and the two side steel plates of the outer groove (8). The two side steel plates of the square steel (10), the friction plates (12), and the double - concave steel plate (13) are all provided with circular holes, and the positions of the circular holes correspond to the positions of the vertical slots and are penetrated by high - strength bolts for connection. The lower end of the outer groove (8) is connected to the foundation through the pin - shaft connecting piece (4); 2. The pre-compressed disc spring self-resetting variable friction reinforced concrete shear wall according to claim 1, wherein The pre - pressure of the axial disc - spring group (7) is adjusted by adjusting the distance between the two connecting nuts (6) at the top and in the middle of the outer groove (8).

3. The pre-compressed disc spring self-resetting variable friction reinforced concrete shear wall according to claim 2, wherein Adjust the second stiffness of the self - resetting variable - friction energy - dissipation unit by adjusting the size and number of the disc springs in the axial disc - spring group (7). Adjust the displacement interval corresponding to the second stiffness by adjusting the gap width between the double - concave steel plate and the convex steel plate on the side of the outer groove. Adjust the third stiffness of the self - resetting variable - friction energy - dissipation unit by adjusting the size, number or convex - concave shape of the disc springs in the lateral disc - spring group (9).

4. The pre-compressed disc spring self-resetting variable friction reinforced concrete shear wall according to claim 3, wherein Adjust the magnitude of the initial friction force by adjusting the pre - tightening force of the high - strength bolts connecting the square steel (10), friction plate (12), outer groove (8), double - concave steel plate (13) and lateral disc - spring group (11), and dissipate seismic energy through sliding friction.

5. The preloaded disc spring self-resetting variable friction reinforced concrete shear wall according to claim 4, wherein, The bottom longitudinal reinforcement of the reinforced - concrete wall part (1) is welded to the upper flange of the I - shaped stiffening steel beam at the top of the inverted - triangle support (2).

6. The preloaded disc spring self-resetting variable friction reinforced concrete shear wall according to claim 5, wherein, The middle part of the hinge support (3) is a concave - shaped steel bearing platform, and the round head at the lower end of the inverted - triangle support (2) fits tightly into the concave shape of the concave - shaped steel bearing platform.

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