A type of earthquake-damaged, deformable, prefabricated steel structure column base

Abstract

This invention relates to prefabricated structural joint technology in civil engineering, and more particularly to a deformable and resilient prefabricated steel structure column base capable of withstanding seismic damage. The column base includes a precast column and a steel foundation. A steel channel is provided on the steel foundation, and connecting side plates with recesses are respectively provided on the front and rear sides of the channel. A replaceable polygonal rotating energy-dissipating connector is installed within the recesses of the connecting side plates. A polygonal side plate, fixedly connected to the lower end of the precast column, is connected to the replaceable polygonal rotating energy-dissipating connector. A connecting steel plate hinged to the steel channel is provided at the lower end of the precast column. A resilient device is provided around the perimeter of the steel foundation between the lower end of the precast column and the connecting side plate. This steel structure column base weakens the stiffness of the connector through openings, achieving outward displacement of the plastic hinge, improving the deformation capacity of the joint, and effectively improving the seismic performance of the column base joint.

Description

Technical Field

[0001] This invention relates to prefabricated structural joint technology in civil engineering, and more particularly to a prefabricated steel structure column base with repairable deformation recovery after seismic damage. Background Technology

[0002] Under seismic loading, precast columns bear vertical loads as well as cyclic horizontal loads. Insufficient bending, shear, and ductility can lead to buckling or failure of the precast columns. The column base joints bear significant combined pressure and bending moments. Due to the combined effect of tension on one side and compression on the other, plastic hinges form prematurely at the column base. The design concept of weakened joints involves weakening the column member at a certain distance from the column base joint, promoting the expansion of plastic hinges at the joint location, and preventing premature buckling of the joint. Summary of the Invention

[0003] The purpose of this invention is to provide a deformable and recoverable prefabricated steel structure column base that can withstand seismic damage. This steel structure column base weakens the stiffness of the connecting parts by opening holes, realizes the outward movement of the plastic hinge, improves the deformation capacity of the node, and effectively improves the seismic performance of the column base node.

[0004] The technical solution of the present invention is as follows: a prefabricated steel structure column base with repairable deformation and resetting capability, comprising a precast column and a steel foundation. A steel channel is provided on the steel foundation, and connecting side plates with recesses are respectively provided on the front and rear sides of the steel channel. A replaceable polygonal rotating energy-dissipating connector is installed in the recess of the connecting side plate. A polygonal side plate fixedly connected to the lower end of the precast column is connected to the replaceable polygonal rotating energy-dissipating connector. A connecting steel plate hinged to the steel channel is provided at the lower end of the precast column. A resetting device is provided between the lower end of the precast column and the perimeter of the steel foundation.

[0005] Furthermore, the steel foundation includes two horizontal seat plates arranged vertically and connected to each other. The steel channel is composed of a pair of vertical steel plates fixed in the middle of the upper horizontal seat plate. A polygonal arc-shaped flange plate for connecting with a replaceable polygonal rotating energy-consuming connector is fixed in the recess of the connecting side plate.

[0006] Furthermore, prestressed cable holes for connecting the reset device are provided at the four corners of the upper horizontal seat plate; pin holes are provided on the upper part of the pair of vertical steel plates; and bolt holes are provided at intervals on the polygonal arc-shaped flange plate.

[0007] Furthermore, the upper and lower transverse seat plates are connected by a number of first stiffening ribs, and the connecting side plate is connected to the upper transverse seat plate by a number of second stiffening ribs.

[0008] Furthermore, the replaceable polygonal rotating energy-consuming connector includes an arc-shaped steel plate with multiple tangent edges, wherein a number of trapezoidal openings are spaced apart on the arc-shaped steel plate, and integral flange plates are fixed to the upper and lower sides of the arc-shaped steel plate respectively.

[0009] Furthermore, each of the flange plates is provided with bolt holes at intervals, and a third stiffening rib is provided at intervals between the upper and lower flange plates.

[0010] Furthermore, the polygonal side plate includes a fixed steel plate at the upper end for welding to the lower end of the precast column, and the lower end of the fixed steel plate is an arc-shaped protrusion structure with multiple cut edges, and is fixed with a fixed wing plate for connecting to a replaceable polygonal rotating energy-consuming connector.

[0011] Furthermore, the precast column includes a steel column, the lower end of which is welded with a transverse steel plate, the connecting steel plate is welded to the middle of the bottom surface of the transverse steel plate and extends downward, and the upper part of the connecting steel plate passes through the transverse steel plate and is welded to the flanges of the steel column along the web direction of the steel column.

[0012] Furthermore, each of the four corners of the transverse steel plate is provided with prestressed cable holes for connecting the resetting device, and several fourth stiffening ribs are welded between the transverse steel plate and the flange of the steel column; the connecting steel plate is provided with bolt holes for hinged connection with the steel channel.

[0013] Furthermore, the resetting device includes prestressed cables at the upper and lower ends for anchoring to precast columns and steel foundations. The prestressed cables are covered with rubber cylinders, and the rubber cylinders are covered with a number of resetting components stacked sequentially from bottom to top. Each resetting component is formed by two annular cup-type resetting plates with their openings facing each other and fastening together.

[0014] Compared with the prior art, the present invention has the following advantages: 1. By setting trapezoidal openings on the replaceable polygonal rotating energy-dissipating connector, the connector's stiffness is weakened, causing earlier failure at the weakened location. Under horizontal reciprocating force, the small steel columns between the opening areas of the replaceable polygonal rotating energy-dissipating connector are stretched by rotation, fully utilizing the plasticity of the steel and greatly increasing the structure's energy dissipation capacity. Simultaneously, the prestressed cables and annular cup-type reset plates at the four corners of the structure provide a certain restoring force. The prestressed cables on the tension side generate a downward restoring force, while the prestressed cables on the compression side are deactivated. The annular cup-type reset plates, under compression, generate an upward rebound force. The tension of the prestressed cables and the rebound force of the annular cup-type reset plates create a couple on the pin, resisting the couple generated on the pin when the small steel columns undergo plastic deformation. This not only facilitates column reset but also helps the small steel columns recover from deformation, thus extending the service life of the energy-dissipating connector.

[0015] 2. After damage, replaceable multi-sided rotating energy-consuming connectors with bolt connections can effectively solve the problem of rapid replacement and repair. Installation is simple, construction is quick, energy consumption is low, and costs are reduced. This is beneficial for repair work after damage, improving construction efficiency and reducing construction costs.

[0016] 3. Simple and practical structure. During on-site installation, the upper flange of the replaceable polygonal rotating energy-dissipating connector is bolted to the precast column via polygonal side plates, and the lower flange is also bolted to the steel foundation, making the perforated splice replaceable. By reducing the stiffness of the connector through perforations, the plastic hinge is moved outward, improving the deformation capacity of the joint and effectively enhancing the seismic performance of the column base joint. The reset device, composed of prestressed cables, annular cup-type reset plates, and rubber cylinders, can resist the plastic deformation of the small steel column of the replaceable polygonal rotating energy-dissipating connector, effectively extending its service life and reducing repair costs. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is the left view of the present invention; Figure 3 This is an exploded view of the present invention; Figure 4 This is a front view of the precast column of the present invention; Figure 5 This is a left view of the precast column of the present invention; Figure 6 This is a front view of the steel foundation of the present invention; Figure 7 This is a left view of the steel foundation of the present invention; Figure 8 This is a front view of the steel connecting plate of the present invention; Figure 9 This is a left view of the steel connecting plate of the present invention; Figure 10 This is a schematic diagram of the replaceable polygonal rotating energy-dissipating connector of the present invention; Figure 11 This is a schematic diagram of the reset device of the present invention; Figure 12 This is a schematic diagram of the rubber cylinder of the present invention; Figure 13 This is a cross-sectional view of the annular cup-type reset piece of the present invention; Figure 14 This is a simplified diagram illustrating the structural failure of the present invention. In the diagram: 10-Precast column; 11-Steel column; 12-Transverse steel plate; 13-Web plate; 14-Flange plate; 15-Prestressed cable hole; 16-Fourth stiffening rib; 17-Bolt hole; 18-Connecting steel plate; 20-Steel foundation; 21-Steel channel; 22-Connecting side plate; 23-Transverse seat plate; 231-Prestressed cable hole; 24-Vertical steel plate; 25-Pin hole; 26-Polygonal arc-shaped flange plate; 27-Bolt hole; 2 8-First stiffening rib; 29-Second stiffening rib; 30-Replaceable polygonal rotating energy-consuming connector; 31-Arc-shaped steel plate; 32-Trapezoidal opening; 33-Flange plate; 34-Bolt hole; 35-Third stiffening rib; 40-Polygonal side plate; 41-Fixed steel plate; 42-Fixed flange plate; 43-Bolt hole; 50-Reset device; 51-Prestressed cable; 52-Rubber cylinder; 53-Annular cup-type reset piece; 60-Pin bolt. Detailed Implementation

[0018] To make the above features and advantages of the present invention more readily understood, specific embodiments are described below in conjunction with the accompanying drawings, but the present invention is not limited thereto.

[0019] refer to Figures 1 to 14 A prefabricated steel structure column base with repairable deformation recovery after seismic damage includes a precast column 10 and a steel foundation 20. A steel channel 21 is provided on the steel foundation, and connecting side plates 22 with recesses are respectively provided on the front and rear sides of the steel channel. A replaceable polygonal rotating energy-dissipating connector 30 is installed in the recess of the connecting side plate. A polygonal side plate 40 fixedly connected to the lower end of the precast column is connected to the replaceable polygonal rotating energy-dissipating connector. A connecting steel plate 19 hinged to the steel channel is provided at the lower end of the precast column. A reset device 50 is provided between the lower end of the precast column and the steel foundation.

[0020] In this embodiment, the steel foundation includes two horizontal support plates 23 arranged vertically and connected to each other, both made of steel plates; the lower horizontal support plate is used to connect to the floor slab. Prestressed cable holes 231 are provided at each of the four corners of the upper horizontal support plate for anchoring the prestressed cables of the connection and repositioning device.

[0021] In this embodiment, the steel channel consists of a pair of vertical steel plates 24 welded to the middle of the upper transverse seat plate. A pin hole 25 is provided on the upper part of the pair of vertical steel plates to allow hinge connection with the connecting steel plate via a pin 60 passing through the pin hole. A polygonal arc-shaped flange plate 26 is fixed within the recess of the connecting side plate. Bolt holes 27 are spaced apart on the polygonal arc-shaped flange plate to allow connection with a replaceable polygonal rotating energy-consuming connector via bolts.

[0022] In this embodiment, in order to improve strength, the upper and lower transverse seat plates are connected by a number of first stiffening ribs 28, and the connecting side plate is connected to the upper transverse seat plate by a number of second stiffening ribs 29 to prevent the column from buckling when subjected to external forces perpendicular to the web of the steel section.

[0023] In this embodiment, the replaceable polygonal rotating energy-dissipating connector includes an arc-shaped steel plate 31 with multiple tangent edges. The arc-shaped steel plate has several trapezoidal openings 32 spaced apart to weaken the rigidity of the column base, thus prioritizing column base failure and protecting the node. Integrated flange plates 33 are fixed to the upper and lower sides of the arc-shaped steel plate to form polygonal arc-shaped steel channels. Each flange plate has bolt holes 34 spaced apart for bolting to the polygonal arc-shaped flange plates of the concave portions of the connecting side plates and to the fixed flange plates of the polygonal side plates.

[0024] In this embodiment, in order to improve strength, a third stiffening rib 35 is provided between the upper and lower flange plates at intervals to prevent out-of-plane buckling caused by bolt tension when the structure is subjected to earthquake action, which would cause the replaceable polygonal rotating energy dissipation connector to get stuck, thus reducing the difficulty of replacing the replaceable polygonal rotating energy dissipation connector in the later stage.

[0025] In this embodiment, the polygonal side plate includes a fixed steel plate 41 with a rectangular upper end for welding to the lower end of the precast column. The lower end of the fixed steel plate has an arc-shaped protrusion structure with multiple cut edges and a fixed wing plate 42 for connecting to the replaceable polygonal rotating energy-dissipating connector. The fixed wing plate is provided with bolt holes 43 so that it can be fixed by bolts passing through the bolt holes after being aligned with the flange plate of the replaceable polygonal rotating energy-dissipating connector.

[0026] In this embodiment, the precast column includes a steel column 11, and a transverse steel plate 12 is welded to the lower end of the steel column to improve the overall integrity of the component; the transverse steel plate is perpendicular to the steel column, and the connecting steel plate is welded to the middle of the bottom surface of the transverse steel plate and extends downward at the lower end; the upper part of the connecting steel plate passes through the transverse steel plate and is welded to the flanges 14 of the steel column along the direction of the web 13 of the steel column.

[0027] In this embodiment, prestressed cable holes 15 are provided at all four corners of the transverse steel plate to anchor it to the upper part of the resetting device; eight fourth stiffening ribs 16 are welded between the transverse steel plate and the wing plate of the steel column to improve the connection strength; bolt holes 17 are provided on the connecting steel plate for hinged connection with the steel channel to connect with the pin hole of the steel channel through a pin.

[0028] In this embodiment, the resetting device includes prestressed cables 51 with upper and lower ends for anchoring to precast columns and steel foundations. A rubber cylinder 52 is fitted over the prestressed cable, and several resetting components are stacked sequentially from bottom to top over the rubber cylinder. Each resetting component consists of two annular cup-type resetting plates 53 with their openings facing each other, thereby preventing lateral displacement of the annular cup-type resetting plates. The rubber cylinder does not participate in bearing force during the entire earthquake; it only serves to fix the annular cup-type resetting plates.

[0029] During installation, the connecting steel plate 18 of the precast column 10 is inserted into the steel channel 21 of the steel foundation 20, ensuring that the pin holes of the connecting steel plate 18 and the steel channel 21 are aligned, and the pin 60 is inserted to make them a whole; the pin 60 should be located at the same center as the replaceable polygonal rotating energy dissipation connector 30. The replaceable polygonal rotating energy dissipation connector 30 is installed between the polygonal side plate 40 and the steel foundation 20, and the three components are connected by bolts to form a basic force transmission system. The four reset devices 50 are respectively anchored to the prestressed cable holes 15 and 231 at the four corners between the precast column 10 and the steel foundation 20, and a gap is left between the annular cup-type reset piece 53 and the transverse seat plate 12.

[0030] Working principle: This invention overcomes the common problems of existing precast columns. Under seismic action, ordinary precast columns bear both vertical and reciprocating horizontal loads. When the bending, shear, and ductility are insufficient, buckling or failure of the precast column can occur. The column base joint bears a large combined pressure and bending moment. Due to the combined bending moment, the column base is subjected to tension on one side and compression on the other, leading to the early formation of plastic hinges. Under vertical loads, vertical bearing capacity is provided by the pin pressing against the hole wall. Under horizontal seismic action, a replaceable polygonal rotating energy-dissipating connector can be used to rotate around the pin. By stretching the arc-shaped steel plate (composed of multiple small steel columns), plastic deformation occurs, generating a circumferential tangential force that creates a couple on the pin, resisting horizontal seismic action. This fully utilizes the hysteresis performance of the replaceable multi-sided rotating energy-dissipating connector; simultaneously, the tension-side prestressed cable generates a downward restoring force, the compression-side prestressed cable disengages, and the annular cup-type reset plate generates an upward rebound force under pressure. The tension of the prestressed cable and the rebound force of the annular cup-type reset plate create a couple on the pin opposite to that of the curved steel plate, aiding in the reset of the precast column. The overall stress situation is as follows... Figure 14 As shown. The above-mentioned device constitutes a multifunctional structure with the ability to resist vertical loads, horizontal seismic forces, and deformation recovery.

[0031] The above description is only a preferred embodiment of the present invention. For those skilled in the art, designing different forms of earthquake-damaged and deformable prefabricated steel structure column bases based on the teachings of the present invention does not require creative labor. All equivalent changes, modifications, substitutions and variations made in accordance with the scope of the patent application of the present invention without departing from the principles and spirit of the present invention shall be covered by the present invention.

Claims

1. A prefabricated steel structure column base with repairable deformation recovery after seismic damage, comprising a precast column and a steel foundation, characterized in that, A steel channel is provided on the steel foundation. Recessed connecting side plates are respectively provided on the front and rear sides of the steel channel. A replaceable polygonal rotating energy-dissipating connector is installed within the recess of the connecting side plate. A polygonal arc-shaped flange plate for connecting with the replaceable polygonal rotating energy-dissipating connector is fixed within the recess of the connecting side plate. A polygonal side plate fixedly connected to the lower end of the precast column is connected to the replaceable polygonal rotating energy-dissipating connector. A connecting steel plate hinged to the steel channel is provided at the lower end of the precast column. A reset device is provided between the steel foundation and the lower end of the precast column. The replaceable polygonal rotating energy-dissipating connector includes an arc-shaped steel plate with multiple tangent edges. Several trapezoidal openings are spaced apart on the arc-shaped steel plate. The upper and lower sides of the arc-shaped steel plate are respectively fixed with integral flange plates; each flange plate is provided with bolt holes at intervals, and a third stiffening rib is provided between the upper and lower flange plates at intervals; the polygonal side plate includes a fixed steel plate at the upper end for welding to the lower end of the precast column, and the lower end of the fixed steel plate is an arc-shaped protrusion structure with multiple tangents, and is fixed with a fixed wing plate for connecting to a replaceable polygonal rotating energy-consuming connector; the reset device includes prestressed cables at the upper and lower ends for anchoring to the precast column and steel foundation, the prestressed cables are covered with rubber cylinders, and the rubber cylinders are covered with several reset components stacked sequentially from bottom to top, the reset components are formed by two annular cup-type reset plates with their openings facing each other.

2. The earthquake-damaged, deformable, prefabricated steel structure column base according to claim 1, characterized in that, The steel foundation includes two horizontal base plates that are arranged vertically and connected to each other, and the steel channel is composed of a pair of vertical steel plates fixed in the middle of the upper horizontal base plate.

3. The earthquake-damaged, deformable, prefabricated steel structure column base with repairable deformation recovery as described in claim 2, characterized in that, The upper horizontal seat plate has prestressed cable holes at its four corners for connecting the reset device; pin holes are provided on the upper part of a pair of vertical steel plates; and bolt holes are provided at intervals on the polygonal arc-shaped flange plate.

4. A prefabricated steel structure column base with repairable deformation recovery based on seismic damage as described in claim 2 or 3, characterized in that, The upper and lower transverse seat plates are connected by several first stiffening ribs, and the connecting side plate is connected to the upper transverse seat plate by several second stiffening ribs.

5. A prefabricated steel structure column base with repairable deformation recovery according to any one of claims 1, 2, or 3, characterized in that, The precast column includes a steel column, the lower end of which is welded with a transverse steel plate. The connecting steel plate is welded to the middle of the bottom surface of the transverse steel plate and extends downward. The upper part of the connecting steel plate passes through the transverse steel plate and is welded to the flanges of the steel column along the web direction.

6. The earthquake-damaged, deformable, prefabricated steel structure column base according to claim 5, characterized in that, The four corners of the transverse steel plate are provided with prestressed cable holes for connecting the reset device, and several fourth stiffening ribs are welded between the transverse steel plate and the flange of the steel column; the connecting steel plate is provided with bolt holes for hinged connection with the steel channel.

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