A self-resetting shear steel rod damper and its working method

Abstract

The present invention relates to a self-resetting shear steel rod damper and a working method thereof, comprising a bottom plate and a pair of vertical steel plates welded on both sides above the bottom plate, an I-shaped steel plate arranged vertically between the vertical steel plates on both sides, a plurality of SMA springs are sandwiched between the lower end of the I-shaped steel plate and the bottom plate, a plurality of energy-absorbing steel rods arranged horizontally are penetrated on the web of the I-shaped steel plate, and the two ends of the energy-absorbing steel rods are fixedly locked on the vertical steel plates on both sides. The self-resetting shear steel rod damper of the present invention has a simple overall structure, low cost, easy processing, flexible layout, and is convenient for disassembly and replacement after an earthquake. Relative displacement is generated by the vertical steel plate and the web of the I-shaped steel plate moving up and down, causing shear yielding of the energy-absorbing steel rod to achieve energy consumption; at the same time, it has a self-resetting function, reduces residual deformation, and effectively improves the seismic performance of the structure.

Description

Technical Field

[0001] The invention relates to a self-resetting shearing steel rod damper and a working method thereof. Background Art

[0002] The existing self-resetting shear damper has a complex structure and inflexible layout and installation. Although the self-resetting lead damper has high ductility and flexibility, the non-weldability of lead limits the application of lead dampers in engineering. The technical solution disclosed in the patent document entitled "A Self-Resetting Lead Extrusion Damper" (Announcement No.: CN 204676725 U) is as follows: A self-resetting lead extrusion damper is composed of four groups of damping units with the same structure, which are hinged in sequence through connecting pins. The damping unit includes an upper plate, an intermediate layer, a plate and a bottom plate, which are connected in sequence through pins. The main bodies of the upper plate, the intermediate layer and the bottom plate are circular structures, and connecting handles are integrally formed on the sides of the circular structures. The upper plate and the bottom plate have the same structure and are both disc-shaped structures with a central through hole in the circular structure part. The circular structure part of the intermediate layer is a ring-shaped structure, and there is a limiting protrusion protruding toward the center of the circle on the inner wall of the ring-shaped structure of the intermediate layer. The defect of this technical solution is that once the limiting protrusion protruding on the intermediate layer and the edge of the pull piece protruding outward of the star-shaped pull piece structure are sheared under large load, lead extrusion energy dissipation and shock absorption cannot be achieved, and the structure of the component is complicated and it is not easy to replace once damaged. The name is damping spring composite shock absorber (Announcement No.: CN 207333543 U) The technical solution disclosed in the patent document is as follows: a damping spring composite shock absorber, comprising a base plate, a first sleeve is arranged on the upper end surface of the base plate, a guide rod is vertically arranged on the first sleeve, a spring is sleeved on the outer wall of the guide rod, one end of the spring is connected to the first sleeve, and the other end is connected to the second sleeve sleeved on the guide rod, two first guide plates are symmetrically arranged on the upper end surface of the base plate on both sides of the first sleeve, a second guide plate is slidably arranged on the inner side of the first guide plate, the top end of the second guide plate is connected to the top plate, a sleeve is arranged on the lower end surface of the top plate, the sleeve is connected to the top of the second sleeve, the top plate and the sleeve are both sleeved on the guide rod, the top plate, the base plate, the first guide plate and the second guide plate are made of rubber, and have a certain shock absorption effect, the defect of this technical solution is that the rubber material has weak resistance to environmental pollution and is easy to age, and the spring is a cylindrical spiral spring, the shock absorption effect is poor, and there is no self-reset function, and the subsequent maintenance cost is high and relatively complicated. The technical solution disclosed in the patent document entitled "A steel rod array damper" (Announcement No.: CN 103290945 A) is as follows: A steel rod matrix damper, including a damping steel rod and an end plate, wherein the damping steel rod includes a damping part and a mortise and tenon part, and the damping steel rod is fixed between the upper end plate and the lower end plate, and is regularly arranged to form an array, and the end plate surface has openings, and the mortise and tenon are inserted into the end plate openings and fixed by welding. The steel rod and the end plate are fixed by welding. The defect of this technical solution is that once the damper is damaged, it cannot be reused, and the cost of repair and replacement is expensive, resulting in low utilization rate and cost performance of the damper. Summary of the invention

[0003] In view of this, the purpose of the present invention is to provide a self-resetting shear steel rod damper and a working method thereof which have a simple structure and are easy to disassemble and replace, and have a self-resetting function and can effectively improve the seismic performance of the structure.

[0004] The present invention is implemented by the following scheme: a self-resetting shear steel rod damper, including a base plate and a pair of vertical steel plates welded on both sides above the base plate, an I-shaped steel plate arranged vertically is provided between the vertical steel plates on both sides, a plurality of SMA springs are sandwiched between the lower end of the I-shaped steel plate and the base plate, a plurality of energy-absorbing steel rods arranged laterally are passed through the web of the I-shaped steel plate, and both ends of the energy-absorbing steel rods are fixedly locked to the vertical steel plates on both sides.

[0005] Furthermore, a top plate is welded to the upper end of the I-shaped steel plate, a contact plate is welded to the lower end of the I-shaped steel plate, the SMA spring is located between the contact plate and the bottom plate, the upper end of the SMA spring is welded and fixed to the contact plate, and the lower end of the SMA spring is welded and fixed to the bottom plate.

[0006] Furthermore, both ends of the energy-absorbing steel rod are provided with external threaded parts, and the external threaded parts at both ends of the energy-absorbing steel rod pass through the vertical steel plates on the corresponding sides and are screwed with locking nuts clamped on the outer sides of the vertical steel plates.

[0007] Furthermore, the energy-absorbing steel rod is composed of a left half steel rod and a right half steel rod. The left and right half steel rods of each energy-absorbing steel rod are located on the inner side of the vertical steel plate and are a conical structure with a small end toward the middle and a large end toward the outside. The left and right half steel rods of each energy-absorbing steel rod are threadedly connected to the same threaded through hole on the web of the I-shaped steel plate toward the middle end.

[0008] Furthermore, the energy-absorbing steel rod is perpendicular to the web of the I-shaped steel plate, and the wing side of the I-shaped steel plate is closely attached to the inner side of the vertical steel plate on the same side.

[0009] Furthermore, there are 6 SMA springs arranged in a 2*3 array, and there are 6 energy-absorbing steel rods arranged in a matrix of two rows and three columns.

[0010] Another technical solution of the present invention: a working method of the self-resetting shear steel rod damper as described above, when the top plate and the bottom plate of the self-resetting shear steel rod damper are subjected to tension and compression, relative displacement is generated by the up and down displacement of the vertical steel plate and the web of the I-shaped steel plate, causing the shear yielding of the energy-absorbing steel rod to achieve energy dissipation, and at the same time, the reaction force generated by the stretched or compressed SMA spring provides a restoring force to achieve self-resetting.

[0011] Compared with the prior art, the present invention has the following beneficial effects: the self-resetting shear steel rod damper of the present invention has a simple overall structure, low cost, easy processing, flexible layout, and is convenient for disassembly and replacement after an earthquake. Relative displacement is generated by the up and down displacement of the vertical steel plate and the web of the I-shaped steel plate, causing the shear yielding of the energy-consuming steel rod to achieve energy dissipation; at the same time, it has a self-resetting function, reduces residual deformation, and effectively improves the seismic performance of the structure.

[0012] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the present invention will be further described in detail below through specific embodiments and related drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 is a top view of the first embodiment of the present invention without the top plate;

[0014] Figure 2 is a front cross-sectional view of a first embodiment of the present invention;

[0015] Figure 3 is a side view of an embodiment of the present invention;

[0016] Figure 4 is a top view of the second embodiment of the present invention without the top plate;

[0017] Figure 5 It is a front cross-sectional view of the second embodiment of the present invention.

[0018] Explanation of the numbers in the figure: 1-bottom plate, 2-SMA spring, 3-vertical steel plate, 4-contact plate, 5-I-shaped steel plate, 6-locking nut, 7-energy-absorbing steel rod, 8-top plate. DETAILED DESCRIPTION

[0019] Embodiment 1: Figures 1 to 3As shown, a self-resetting shear steel rod damper comprises a bottom plate 1 and a pair of vertical steel plates 3 welded on both sides above the bottom plate, an I-shaped steel plate 5 arranged vertically is provided between the vertical steel plates 3 on both sides, that is, the web and wing plates of the I-shaped steel plate are parallel to the vertical direction, a plurality of SMA springs 2 are sandwiched between the lower end of the I-shaped steel plate 5 and the bottom plate, a plurality of energy-absorbing steel rods arranged horizontally are penetrated on the web of the I-shaped steel plate 5, the energy-absorbing steel rods are perpendicular to the web of the I-shaped steel plate 5, and the two ends of the energy-absorbing steel rod 7 are fixedly locked on the vertical steel plates 3 on both sides. The damper generates relative displacement through the up and down displacement of the vertical steel plate and the web of the I-shaped steel plate, causing the shear yield of the energy-absorbing steel rod to achieve energy dissipation. It has a clear force mechanism and flexible layout, which can significantly improve the seismic resistance of buildings. At the same time, an SMA spring is arranged at the bottom of the damper to provide restoring force, realize self-resetting function, and reduce residual deformation. The damper is mainly installed in the structure frame, frame-shear wall and connecting beam span in the earthquake-prone zone to solve the problem of large deformation and damage of the actual structure under tension and compression under earthquake action, and effectively improve the seismic performance of the structure.

[0020] In this embodiment, a top plate 8 is welded to the upper end of the I-shaped steel plate 5, and a contact plate 4 is welded to the lower end of the I-shaped steel plate. The SMA spring is located between the contact plate 4 and the bottom plate 8. The upper end of the SMA spring is welded and fixed to the contact plate, and the lower end of the SMA spring is welded and fixed to the bottom plate.

[0021] In this embodiment, external threaded portions are provided at both ends of the energy-absorbing steel rod 7. The external threaded portions at both ends of the energy-absorbing steel rod pass through the vertical steel plates on the corresponding sides and are screwed with locking nuts 6 clamped on the outer sides of the vertical steel plates. The vertical steel plates are tightly attached to the I-shaped steel plates through the energy-absorbing steel rods.

[0022] In this embodiment, the wing plate side edges of the I-shaped steel plate are closely attached to the inner side surface of the vertical steel plate on the same side.

[0023] In this embodiment, there are 6 SMA springs arranged in a 2*3 array, and there are 6 energy-absorbing steel bars arranged in a two-row and three-column matrix, but it is not limited thereto. In the specific implementation process, the number and arrangement of SMA springs and energy-absorbing steel bars can be set as needed; the relevant descriptions below are also modified. The vertical steel plate and the web of the I-shaped steel plate are displaced up and down to cause the energy-absorbing steel bars to shear and yield to achieve the purpose of energy dissipation. The SMA springs arranged at the bottom are stretched or compressed when the vertical steel plate and the web of the I-shaped steel plate are displaced up and down. The reaction force generated by the stretched or compressed SMA springs provides the damper with the force required for resetting, so that the damper has the characteristic of self-resetting.

[0024] Embodiment 2: Figures 4 and 5As shown, the difference between this embodiment and the first embodiment lies in the different structures of the energy-absorbing steel rods. The energy-absorbing steel rods in the first embodiment are of a whole equal-diameter round rod structure, while in this embodiment, the energy-absorbing steel rods are composed of a left half steel rod and a right half steel rod. The rod sections of the left and right half steel rods of each energy-absorbing steel rod located on the inner side of the vertical steel plate are tapered structures with a small end toward the middle and a large end toward the outside. The left half steel rod and the right half steel rod are provided with external threaded portions toward the middle end. The left and right half steel rods of each energy-absorbing steel rod are threadedly connected to the same threaded through hole on the web of the I-shaped steel plate toward the middle end. The working part of the energy-absorbing steel rods in this embodiment (i.e., the rod section passing through the vertical steel plate inward) adopts a variable cross-section form, so that more cross-sections enter the energy-absorbing part. In the best case, the full-domain yield energy-absorbing part can be achieved, thereby improving the energy-absorbing capacity of the device.

[0025] The materials used for the self-resetting shear steel rod damper of the present invention are steel, nuts and SMA springs. The materials are inexpensive, easy to process, and simple in structure. They are convenient to replace after damage and are not prone to waste of materials. They can well comply with the "environmentally friendly and sustainable" architectural principle. The damper has a simple overall structure, is economical and practical, and is easy to disassemble and replace after an earthquake.

[0026] The bottom plate and top plate of the damper are usually connected to the support and arranged in the structure. In actual engineering applications, oblique and herringbone installation methods are often used:

[0027] Oblique installation: The damper is connected in series on the diagonal support, and the relative displacement at both ends of the damper is greater than the inter-layer lateral displacement of the structure. The structure is simple and easy to assemble, but it occupies a large space, which is not conducive to the passage of personnel and the arrangement of doors and windows, and the node burden is heavy.

[0028] Herringbone installation: The damper is connected in series to the horizontal rod at the top of the herringbone support, or directly connected between the herringbone support and the frame beam. The relative displacement at both ends of the damper is equal to the inter-story lateral displacement of the structure. In this installation form, the damper can fully utilize its energy dissipation capacity, which is convenient for opening door openings in the middle of the span. The lateral stability should be fully considered when designing the support.

[0029] A working method of the self-resetting shear steel rod damper as described above: the self-resetting shear steel rod damper is arranged in a structure through a bottom plate and a top plate. When the top plate and the bottom plate of the self-resetting shear steel rod damper are subjected to tension and compression, relative displacement is generated by the vertical steel plate and the I-shaped steel plate web moving up and down, causing shear yielding of the energy-absorbing steel rod to achieve energy dissipation. At the same time, the reaction force generated by the SMA spring subjected to tension or compression provides a restoring force to achieve self-resetting, reduce residual deformation, solve the problem of large deformation and damage of the actual structure under tension and compression under earthquake action, and effectively improve the seismic performance of the structure.

[0030] Unless otherwise stated, any technical solution disclosed in the present invention disclosed above, if it discloses a numerical range, then the disclosed numerical range is a preferred numerical range, and any technician in the field should understand that the preferred numerical range is only a numerical value with a more obvious technical effect or representative value among many implementable numerical values. Since there are too many numerical values ​​to be exhaustive, the present invention discloses some numerical values ​​to illustrate the technical solution of the present invention, and the numerical values ​​listed above should not constitute a limitation on the scope of protection of the present invention.

[0031] If the present invention discloses or involves components or structures that are fixedly connected to each other, then, unless otherwise stated, the fixed connection can be understood as: a detachable fixed connection (for example, connection using bolts or screws), and can also be understood as: a non-detachable fixed connection (for example, riveting, welding). Of course, the mutual fixed connection can also be replaced by an integrated structure (for example, manufactured by integrated molding using a casting process) (except when it is obviously impossible to use an integrated molding process).

[0032] In addition, unless otherwise stated, the terms used to indicate positional relationships or shapes in any of the technical solutions disclosed in the present invention include states or shapes that are approximate, similar, or close to them.

[0033] Any component provided by the present invention may be assembled from a plurality of separate components, or may be a separate component manufactured by an integral forming process.

[0034] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, ordinary technicians in the field should understand that the specific implementation methods of the present invention can still be modified or some technical features can be replaced by equivalents without departing from the spirit of the technical solution of the present invention, which should be included in the scope of the technical solution for protection of the present invention.

Claims

1. A self-resetting shear steel rod damper, characterized in that: It comprises a bottom plate and a pair of vertical steel plates welded on both sides above the bottom plate, an I-shaped steel plate arranged vertically is arranged between the vertical steel plates on both sides, the web and wing plates of the I-shaped steel plate are parallel to the vertical direction, the wing plate side edges of the I-shaped steel plate are close to the inner side surface of the vertical steel plate on the same side, a plurality of SMA springs are sandwiched between the lower end of the I-shaped steel plate and the bottom plate, a plurality of energy-absorbing steel bars arranged horizontally are penetrated on the web of the I-shaped steel plate, and the two ends of the energy-absorbing steel bars are fixedly locked on the vertical steel plates on both sides; the energy-absorbing steel bar is composed of a left half steel bar and a right half steel bar, and the left and right half steel bars of each energy-absorbing steel bar are located on the inner side of the vertical steel plate and are a conical structure with a small end toward the middle and a large end toward the outside, and the left and right half steel bars of each energy-absorbing steel bar are threadedly connected to the same threaded through hole on the web of the I-shaped steel plate toward the middle end.

2. The self-resetting shear steel rod damper according to claim 1 is characterized in that: A top plate is welded to the upper end of the I-shaped steel plate, a contact plate is welded to the lower end of the I-shaped steel plate, the SMA spring is located between the contact plate and the bottom plate, the upper end of the SMA spring is welded and fixed to the contact plate, and the lower end of the SMA spring is welded and fixed to the bottom plate.

3. The self-resetting shear steel rod damper according to claim 2 is characterized in that: The energy-absorbing steel rod is provided with external threaded parts at both ends, and the external threaded parts at both ends of the energy-absorbing steel rod pass through the vertical steel plates on the corresponding sides and are screwed with locking nuts clamped on the outer sides of the vertical steel plates.

4. The self-resetting shear steel rod damper according to claim 1 is characterized in that: The energy-absorbing steel rod is perpendicular to the web of the I-shaped steel plate, and the wing side of the I-shaped steel plate is closely attached to the inner side of the vertical steel plate on the same side.

5. The self-resetting shear steel rod damper according to claim 1 is characterized in that: There are 6 SMA springs arranged in a 2*3 array, and there are 6 energy-absorbing steel rods arranged in a matrix of two rows and three columns.

6. A method for operating the self-resetting shear steel rod damper as claimed in claim 1, characterized in that: When the top and bottom plates of the self-resetting shear steel rod damper are subjected to tension and compression, relative displacement is generated by the up and down displacement of the vertical steel plate and the I-shaped steel plate web, causing the shear yield of the energy-absorbing steel rod to dissipate energy. At the same time, the reaction force generated by the stretched or compressed SMA spring provides a restoring force to achieve self-resetting.

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