An assembled steel structure beam-column joint provided with a weakened energy dissipation device

Abstract

The application provides an assembled steel structure beam-column joint provided with weakened energy dissipation devices, which comprises a column body and a beam body. One end of the beam body is fixed between two positioning clamping plates through a pin shaft. The pin shaft is inserted into a sleeve, and the sleeve is perpendicular to the beam body. Stiffening ribs are arranged on the surface of the beam body. A weakened energy dissipation device is arranged on the upper and lower end faces of the beam body close to the end of the column body. Each energy dissipation device comprises an energy dissipation plate which is connected to the corresponding end face of the beam body through two connecting positions. A buckling-resistant cover plate is attached to the surface of the energy dissipation plate at one connecting position. A rubber pad is arranged between the corresponding energy dissipation plate and the end face of the beam body. A long circular hole is formed in the energy dissipation plate. The buckling-resistant cover plate, the energy dissipation plate and the rubber pad are connected to the corresponding end face of the beam body at the connecting position through fasteners. The energy dissipation plate is fixed to the corresponding end face of the beam body at the connecting position through another fastener. A carbon fiber cloth is arranged across the cover plate. The energy dissipation plate is further provided with two connecting plates which are perpendicular to the plate surface and are connected to one side end of the two positioning clamping plates respectively.

Description

Technical Field

[0001] This invention belongs to the field of prefabricated steel structures in civil engineering, and specifically relates to a prefabricated steel structure beam-column joint with a weakening energy dissipator. Background Technology

[0002] Prefabricated steel structure buildings have advantages such as lightweight and high strength, good seismic performance, high degree of industrialization, fast construction speed, recyclable and reusable materials, and green and low carbon emissions. In the devastating 1994 Northridge earthquake in the United States and the 1995 Hanshin earthquake in Japan, the extensive damage to steel frame structures under seismic action was concentrated at the joints, resulting in enormous difficulties in post-earthquake recovery and high maintenance costs. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to overcome the above-mentioned deficiencies of the prior art and provide a prefabricated steel structure beam-column joint with a weakening energy dissipator that can effectively reduce or avoid seismic damage to the main structure and improve the seismic toughness of the entire building.

[0004] The technical problem it aims to solve can be addressed through the following technical solutions.

[0005] A prefabricated steel structure beam-column joint with a weakening energy dissipator is characterized by comprising a vertical column and a horizontal beam. One end of the beam is fixed between a pair of positioning plates via a pin shaft. One end of the positioning plate is fixed to the side of the column, and the other end extends along the side of the column toward one side of the beam. The space between the extended portions of the pair of positioning plates forms a positioning part for fixing the end of the beam.

[0006] The pin is inserted into the pin sleeve, the pin sleeve is vertically fixed to the side end of the beam, and the beam surface at the junction of the pin sleeve and the beam is provided with sleeve stiffening ribs.

[0007] The upper and lower ends of the beam near the column are respectively equipped with a first weakening energy dissipator and a second weakening energy dissipator.

[0008] The first weakened energy dissipator includes a first weakened energy dissipation plate, which is connected to the upper end face of the beam via a first connecting position and a second connecting position. At the first connecting position, a first anti-buckling cover plate is fitted abutting the upper part of the first weakened energy dissipation plate. A first rubber pad is placed between the first weakened energy dissipation plate below the anti-buckling cover plate and the upper end face of the beam. A first elongated hole is formed on the first weakened energy dissipation plate, and the direction of the first elongated hole is parallel to the direction of the beam. The first anti-buckling cover plate is secured by a first fastener. A buckling cap plate, a first weakened energy-dissipating plate, and a first rubber pad are connected and fixed to the upper end face of the beam at a first connection position, and the first fastener passes through the first elongated hole; the first weakened energy-dissipating plate is fixed to the upper end face of the beam at a second connection position by a second fastener; wherein, a first carbon fiber cloth with prestress is also included, the carbon fiber cloth spans the upper part of the first buckling cap plate, the part overlapping with the first buckling cap plate is attached to the upper surface of the first buckling cap plate, and the other part is attached to the upper surface of the first weakened energy-dissipating plate;

[0009] The first weakened energy-consuming board is also provided with a pair of connecting plates that are perpendicularly connected to its surface. The two connecting plates are arranged opposite to each other at both ends of the weakened energy-consuming board near the column. The two connecting plates are respectively connected and positioned at the upper ends of the two positioning clamps.

[0010] The second weakened energy dissipator includes a second weakened energy dissipation plate. The surface of the weakened energy dissipation plate is adhered with prestressed carbon fiber cloth. The second weakened energy dissipation plate is connected to the lower end face of the beam via a third connection and a fourth connection. At the third connection, a second buckling-resistance cover is fitted to the lower part of the second weakened energy dissipation plate. A second rubber pad is placed between the second weakened energy dissipation plate above the buckling-resistance cover and the upper end face of the beam. A second elongated hole is formed on the second weakened energy dissipation plate, and the direction of the second elongated hole is parallel to the direction of the beam. The fasteners are used to fix the second buckling-resistance cover plate, the second weakened energy-dissipating plate, and the second rubber pad at the third connection position to the lower end face of the beam body. The third fastener passes through the second elongated hole. The second weakened energy-dissipating plate is fixed to the lower end face of the beam body at the fourth connection position by the fourth fastener. The beam body also includes a second carbon fiber cloth with prestress applied. The carbon fiber cloth spans the lower part of the second buckling-resistance cover plate. The part of the carbon fiber cloth that overlaps with the second buckling-resistance cover plate is attached to the lower surface of the second buckling-resistance cover plate, and the other part is attached to the lower surface of the second weakened energy-dissipating plate.

[0011] The second weakened energy-consuming board is also provided with a pair of connecting plates that are perpendicularly connected to its surface. The two connecting plates are arranged opposite each other at both ends of the weakened energy-consuming board near the column. The two connecting plates are respectively connected and positioned at the lower ends of the two positioning clamps.

[0012] As one of the preferred embodiments of this technical solution, the beam is an H-shaped steel beam, which is composed of an upper flange, a lower flange, and a web connecting the upper and lower flanges. The upper end face of the upper flange forms the upper end face of the beam, and the lower end face of the lower flange forms the lower end face of the beam.

[0013] More preferably, the pin sleeve is vertically fixed to the two side plates of the web.

[0014] Furthermore, the sleeve stiffening rib is disposed on the surface of the web plate, and its direction is parallel to the column.

[0015] As a further improvement to this technical solution, the width of the first weakened energy-dissipating plate is adapted to the width of the upper end face of the beam; the width of the second weakened energy-dissipating plate is adapted to the width of the lower end face of the beam.

[0016] As a further improvement to this technical solution, the first weakened energy-consuming board has two parallel first elongated holes, each corresponding to a first fastener; the second weakened energy-consuming board has two parallel second elongated holes, each corresponding to a second fastener.

[0017] As a further improvement to this technical solution, the connecting plate, which is perpendicular to the surface of the first weakened energy-consuming plate, is located at the upper part of the surface relative to the first weakened energy-consuming plate; the connecting plate, which is perpendicular to the surface of the second weakened energy-consuming plate, is located at the lower part of the surface relative to the second weakened energy-consuming plate.

[0018] In a preferred embodiment of the present invention, the pin is located at the midpoint of the beam in the vertical direction.

[0019] As a further improvement to this technical solution, a gap is left between the beam and the column to allow for relative rotation.

[0020] Preferably, the column is a rectangular steel tube concrete column.

[0021] By adopting a main structural form and component connection method that can be quickly replaced and easily restored, and by setting connectors with significant energy dissipation capacity at key connection points of the prefabricated steel structure, seismic damage to the main structure can be effectively reduced or avoided, and the seismic toughness of the entire building can be improved. This is of great significance for rapid recovery and maintenance after an earthquake.

[0022] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0023] The present invention has strong load-bearing capacity, high assembly efficiency, and excellent structural seismic toughness. It can achieve the effect that only the weakened energy dissipator undergoes plastic deformation to dissipate energy during an earthquake, while the other components remain elastic. Prestress is applied to the carbon fiber cloth, thereby realizing the self-resetting function of the nodes after the earthquake. After the earthquake, the stress performance of the main structure can be quickly restored by replacing the weakened energy dissipator. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0025] Figure 1 This is a front view of the prefabricated steel structure beam-column joint with a weakened energy dissipator provided by the present invention;

[0026] Figure 2 This is a top view of the prefabricated steel structure beam-column joint with a weakened energy dissipator provided by the present invention;

[0027] Figure 3 This is a front view of the prefabricated steel structure beam-column joint with a weakened energy dissipator provided by the present invention. Figure 3 Vito;

[0028] Figure 4 This is a front view of the energy-saving panel provided by the present invention;

[0029] Figure 5 This is a top view of the energy-reducing panel provided by the present invention.

[0030] In the diagram: 1—beam; 11—upper flange; 12—lower flange; 13—web plate; 2—column; 3—pin; 31—pin sleeve, 32—sleeve stiffening rib; 4—column side plate; 5—weakening energy dissipator; 51—connecting plate; 52—weakening energy dissipation plate; 53—anti-buckling cover plate; 54—rubber pad; 55—carbon fiber cloth; 56—fastener; 57—oblong hole; 58, 59—bolts. Detailed Implementation

[0031] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. The objectives, technical solutions, and advantages of the present invention will become clearer from the following description. It should be noted that the described embodiments are preferred embodiments of the present invention, but not all embodiments.

[0032] Combined with appendix Figure 1 ~Attached Figure 5The prefabricated steel structure beam-column joint with a weakened energy dissipator includes beam 1, column 2, pin 3, column side plate 4, and weakened energy dissipator 5.

[0033] The column side plate 4 consists of two steel plates. One end is welded to the side of the rectangular steel tube concrete column 2, and the other end has a pin hole in the middle and bolt holes at the top and bottom. The steel plate can be rectangular, and the shape can be optimized according to the stress distribution when the size is large. That is, the two symmetrical column side plates 4 are welded to both sides of the column 2 (rectangular steel tube concrete column). A part of the column side plate 4 is welded and fixed to the column body, and the other part extends outward along the surface of the column body. The extended parts of the two column side plates form a pair of positioning clamps for positioning and installing an H-shaped steel beam (i.e., beam 1 in the figure).

[0034] The H-shaped steel beam, serving as the beam body, is composed of an upper flange 11, a lower flange 12, and a web 13 connecting the upper and lower flanges. One end of the H-shaped steel beam is placed on two positioning clamping plates. Pin sleeves 31 are vertically installed at corresponding positions on both sides of the web 13. Near the web, the pin sleeves 31 are fitted with sleeve stiffening ribs 32 that are welded to the upper and lower flanges and the web (these sleeve stiffening ribs are installed on both sides of the web). A pin 3 passing through the inner cylinder of the pin sleeve 31 connects the H-shaped steel beam and the two column side plates 4.

[0035] A weakening energy dissipator 5 is installed on the upper part of the upper flange 11 and the lower part of the lower flange 12 near the positioning clamp. Taking the weakening energy dissipator on the upper flange 11 as an example, the weakening energy dissipator 5 includes a weakening energy dissipation plate 52 adapted to the width of the upper flange 11. The weakening energy dissipation plate 52 is provided with a set of two connecting plates 51 perpendicularly connected to its plate surface. The two connecting plates are arranged opposite each other at both ends of the weakening energy dissipation plate 52 near the column 2. The connecting plates are located on the upper part of the plate surface relative to the weakening energy dissipation plate 52. After being fastened by corresponding fasteners 56, the two connecting plates 51 are respectively connected to the column side plate 4 on the corresponding side. The weakening energy dissipation plate 52 has an elongated hole 57 according to the bending bearing capacity requirement of the node. An anti-buckling cover plate 53 is provided on the upper side of the weakening energy dissipation plate 52 and installed by bolts passing through the elongated hole 57 (two in total). A rubber pad 54 is provided on the lower side of the weakening energy dissipation plate 52.

[0036] The buckling-resistance plate is positioned on top of the weakened energy-dissipating plate. When the weakened energy-dissipating plate is under pressure, the buckling-resistance plate can restrain it, preventing buckling and maintaining its compressive strength and energy dissipation capacity. The rubber pad is positioned below the buckling-resistance plate, ensuring that it can deform freely under tension and is not restrained by the lower steel beam flange plate.

[0037] Simultaneously, prestressed carbon fiber cloth 55 is adhered to the upper surfaces of the weakened energy dissipation plate 52 and the buckling-resistance cover plate 53. This carbon fiber cloth extends across the buckling-resistance cover plate 53 along its length, with the portion overlapping the cover plate attached to its upper surface, and the extended portions attached to the upper surface of the weakened energy dissipation plate 52. The arrangement is similar to binding it to the energy dissipation plate with "tape." When installing the carbon fiber cloth, it is best to avoid the threaded holes, and its length should be significantly greater than the dimensions occupied by the buckling-resistance cover plate.

[0038] Because the carbon fiber cloth is placed on the upper surface of the buckling-resistance cover plate and prestressed, it can provide a restoring force to the buckling-resistance cover plate after it is deformed under tension, reducing its participation in deformation and ensuring that it can be replaced after failure.

[0039] The weakened energy dissipator 5 is connected to the column side plate 4 by fasteners 56 and to the upper flange 11 of the beam by bolts 58 and 59 (where bolt 58 also connects and fixes the anti-buckling cover plate 53 and rubber pad 54 to the weakened energy dissipation plate 52), and has the functions of load bearing, energy dissipation and replacement.

[0040] Correspondingly, a weakening energy dissipator 5 is provided on the upper and lower sides of beam 1. The connection method of the weakening energy dissipator 5 provided on the lower side is similar to that of the one provided on the upper side (symmetrical). Both are prevented from buckling under pressure by anti-buckling cover plate 53 and rubber pad 54. Prestressed carbon fiber cloth 55 is provided to realize self-reset after node deformation.

[0041] The H-shaped steel beam (i.e., beam 1) transmits all the shear force at the end of beam 1 through pin 3, and the end of beam 1 has good rotational capacity. In order to ensure that the plastic deformation of the beam-column joint is concentrated in the buckling-restrained cap plate when under stress, the gap required for rotation is left between the weakening energy dissipator 5 and the upper flange 11 and lower flange 12 of the H-shaped steel beam, and between the end of the H-shaped steel beam and the rectangular steel tube concrete column (i.e., column 2). When the end of the H-shaped steel beam rotates, the bending moment is transmitted through the weakening energy dissipator 5, and the shear force borne by pin 3 remains basically unchanged.

[0042] The node structure provided by this invention transmits beam end shear force to the column side plate via a pin, and beam end bending moment to the column side plate via a weakened energy dissipator connected to the upper and lower flanges. A buckling-resistance cover prevents the weakened energy dissipator from buckling under compression, a rubber pad enhances its buckling resistance, and prestressed carbon fiber cloth enables the node to self-reset. During an earthquake, the weakened energy dissipates seismic energy through the tension and compression of the weakened energy dissipator, while the remaining parts remain elastic. After an earthquake, if the weakened energy dissipator undergoes excessive plastic deformation, it can be quickly disassembled and replaced, achieving rapid restoration of structural function. This node possesses three characteristics: load-bearing capacity, energy dissipation, and easy recovery. Furthermore, the node is connected to the column side plate by only two side plates, making fabrication and on-site installation very convenient.

[0043] Of course, the above description is only a preferred embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Obviously, any person skilled in the art can easily conceive of substitutions or changes to obtain other embodiments based on the above embodiments, and these should all be covered within the scope of protection of the present invention.

Claims

1. A prefabricated steel structure beam-column joint with a weakened energy dissipator, characterized in that, It includes a vertical column and a horizontal beam. One end of the beam is fixed between a pair of positioning plates via a pin. One end of the positioning plate is fixed to the side of the column, and the other end extends along the side of the column toward one side of the beam. The space between the extended portions of the pair of positioning plates forms a positioning part that fixes the end of the beam. The pin is inserted into the pin sleeve, the pin sleeve is vertically fixed to the side end of the beam, and the beam surface at the junction of the pin sleeve and the beam is provided with sleeve stiffening ribs. The upper and lower ends of the beam near the column are respectively equipped with a first weakening energy dissipator and a second weakening energy dissipator. The first weakened energy dissipator includes a first weakened energy dissipation plate, which is connected to the upper end face of the beam via a first connecting position and a second connecting position. At the first connecting position, a first anti-buckling cover plate is fitted abutting the upper part of the first weakened energy dissipation plate. A first rubber pad is placed between the first weakened energy dissipation plate below the anti-buckling cover plate and the upper end face of the beam. A first elongated hole is formed on the first weakened energy dissipation plate, and the direction of the first elongated hole is parallel to the direction of the beam. The first anti-buckling cover plate is secured by a first fastener. A buckling cap plate, a first weakened energy-dissipating plate, and a first rubber pad are connected and fixed to the upper end face of the beam at a first connection position, and the first fastener passes through the first elongated hole; the first weakened energy-dissipating plate is fixed to the upper end face of the beam at a second connection position by a second fastener; wherein, a first carbon fiber cloth with prestress is also included, the carbon fiber cloth spans the upper part of the first buckling cap plate, the part overlapping with the first buckling cap plate is attached to the upper surface of the first buckling cap plate, and the other part is attached to the upper surface of the first weakened energy-dissipating plate; The first weakened energy-consuming board is also provided with a pair of connecting plates that are perpendicularly connected to its surface. The two connecting plates are arranged opposite to each other at both ends of the weakened energy-consuming board near the column. The two connecting plates are respectively connected and positioned at the upper ends of the two positioning clamps. The second weakened energy dissipator includes a second weakened energy dissipation plate, which is connected to the lower end face of the beam via a third connection and a fourth connection. At the third connection, a second anti-buckling cover is fitted to the lower part of the second weakened energy dissipation plate. A second rubber pad is placed between the second weakened energy dissipation plate above the anti-buckling cover and the upper end face of the beam. A second elongated hole is formed on the second weakened energy dissipation plate, and the direction of the second elongated hole is parallel to the direction of the beam. The second anti-buckling cover is secured by a third fastener. The buckling cap plate, the second weakened energy dissipation plate, and the second rubber pad are connected and fixed to the lower end face of the beam at the third connection position, and the third fastener passes through the second elongated hole; the second weakened energy dissipation plate is fixed to the lower end face of the beam at the fourth connection position by the fourth fastener; wherein, a second carbon fiber cloth with prestress is also included, the carbon fiber cloth spans the lower part of the second buckling cap plate, the part overlapping with the second buckling cap plate is attached to the lower surface of the second buckling cap plate, and the other part is attached to the lower surface of the second weakened energy dissipation plate; The second weakened energy-consuming board is also provided with a pair of connecting plates that are perpendicularly connected to its surface. The two connecting plates are arranged opposite each other at both ends of the weakened energy-consuming board near the column. The two connecting plates are respectively connected and positioned at the lower ends of the two positioning clamps.

2. The prefabricated steel structure beam-column joint with a weakened energy dissipator as described in claim 1, characterized in that, The beam is an H-shaped steel beam, which is composed of an upper flange, a lower flange, and a web connecting the upper and lower flanges. The upper end face of the upper flange forms the upper end face of the beam, and the lower end face of the lower flange forms the lower end face of the beam.

3. The prefabricated steel structure beam-column joint with a weakened energy dissipator as described in claim 2, characterized in that, The pin sleeve is vertically fixed to the two side plates of the web.

4. The prefabricated steel structure beam-column joint with a weakened energy dissipator as described in claim 3, characterized in that, The sleeve stiffening ribs are disposed on the surface of the web plate, and their orientation is parallel to that of the column.

5. The prefabricated steel structure beam-column joint with a weakening energy dissipator as described in any one of claims 1-4, characterized in that, The first weakened energy-dissipating plate is adapted to the width of the upper end face of the beam; the second weakened energy-dissipating plate is adapted to the width of the lower end face of the beam.

6. The prefabricated steel structure beam-column joint with a weakening energy dissipator as described in any one of claims 1-4, characterized in that, The first weakened energy-consuming board has two parallel first elongated holes, each corresponding to a first fastener; the second weakened energy-consuming board has two parallel second elongated holes, each corresponding to a second fastener.

7. The prefabricated steel structure beam-column joint with a weakening energy dissipator as described in any one of claims 1-4, characterized in that, The connecting plate, which is perpendicular to the surface of the first weakened energy-consuming plate, is located above the surface of the first weakened energy-consuming plate; the connecting plate, which is perpendicular to the surface of the second weakened energy-consuming plate, is located below the surface of the second weakened energy-consuming plate.

8. The prefabricated steel structure beam-column joint with a weakened energy dissipator as described in claim 1, characterized in that, The pin is located at the midpoint of the beam in the vertical direction.

9. The prefabricated steel structure beam-column joint with a weakened energy dissipator as described in claim 1 or 8, characterized in that, A clearance is provided between the beam and the column to allow for relative rotation.

10. The prefabricated steel structure beam-column joint with a weakened energy dissipator as described in claim 1, characterized in that, The column is a rectangular steel-concrete composite column.

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