CN114232794A - Self-resetting support assembly type friction connection node and performance design method thereof - Google Patents

Self-resetting support assembly type friction connection node and performance design method thereof Download PDF

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Publication number
CN114232794A
CN114232794A CN202111504718.0A CN202111504718A CN114232794A CN 114232794 A CN114232794 A CN 114232794A CN 202111504718 A CN202111504718 A CN 202111504718A CN 114232794 A CN114232794 A CN 114232794A
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China
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plate
node
self
resetting
connection
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CN202111504718.0A
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徐龙河
黄楚城
谢行思
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Beijing Jiaotong University
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Beijing Jiaotong University
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    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
    • E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
    • E04B1/18—Structures comprising elongated load-supporting parts, e.g. columns, girders, skeletons
    • E04B1/24—Structures comprising elongated load-supporting parts, e.g. columns, girders, skeletons the supporting parts consisting of metal
    • E04B1/2403—Connection details of the elongated load-supporting parts
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
    • E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
    • E04B1/38—Connections for building structures in general
    • E04B1/58—Connections for building structures in general of bar-shaped building elements
    • E04B1/5806—Connections for building structures in general of bar-shaped building elements with a cross-section having an open profile
    • E04B1/5812—Connections for building structures in general of bar-shaped building elements with a cross-section having an open profile of substantially I - or H - form
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
    • E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
    • E04B1/62—Insulation or other protection; Elements or use of specified material therefor
    • E04B1/92—Protection against other undesired influences or dangers
    • E04B1/98—Protection against other undesired influences or dangers against vibrations or shocks; against mechanical destruction, e.g. by air-raids
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04H—BUILDINGS OR LIKE STRUCTURES FOR PARTICULAR PURPOSES; SWIMMING OR SPLASH BATHS OR POOLS; MASTS; FENCING; TENTS OR CANOPIES, IN GENERAL
    • E04H9/00—Buildings, groups of buildings or shelters adapted to withstand or provide protection against abnormal external influences, e.g. war-like action, earthquake or extreme climate
    • E04H9/02—Buildings, groups of buildings or shelters adapted to withstand or provide protection against abnormal external influences, e.g. war-like action, earthquake or extreme climate withstanding earthquake or sinking of ground
    • E04H9/021—Bearing, supporting or connecting constructions specially adapted for such buildings
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04H—BUILDINGS OR LIKE STRUCTURES FOR PARTICULAR PURPOSES; SWIMMING OR SPLASH BATHS OR POOLS; MASTS; FENCING; TENTS OR CANOPIES, IN GENERAL
    • E04H9/00—Buildings, groups of buildings or shelters adapted to withstand or provide protection against abnormal external influences, e.g. war-like action, earthquake or extreme climate
    • E04H9/02—Buildings, groups of buildings or shelters adapted to withstand or provide protection against abnormal external influences, e.g. war-like action, earthquake or extreme climate withstanding earthquake or sinking of ground
    • E04H9/021—Bearing, supporting or connecting constructions specially adapted for such buildings
    • E04H9/0215—Bearing, supporting or connecting constructions specially adapted for such buildings involving active or passive dynamic mass damping systems
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04H—BUILDINGS OR LIKE STRUCTURES FOR PARTICULAR PURPOSES; SWIMMING OR SPLASH BATHS OR POOLS; MASTS; FENCING; TENTS OR CANOPIES, IN GENERAL
    • E04H9/00—Buildings, groups of buildings or shelters adapted to withstand or provide protection against abnormal external influences, e.g. war-like action, earthquake or extreme climate
    • E04H9/02—Buildings, groups of buildings or shelters adapted to withstand or provide protection against abnormal external influences, e.g. war-like action, earthquake or extreme climate withstanding earthquake or sinking of ground
    • E04H9/021—Bearing, supporting or connecting constructions specially adapted for such buildings
    • E04H9/0237—Structural braces with damping devices
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04H—BUILDINGS OR LIKE STRUCTURES FOR PARTICULAR PURPOSES; SWIMMING OR SPLASH BATHS OR POOLS; MASTS; FENCING; TENTS OR CANOPIES, IN GENERAL
    • E04H9/00—Buildings, groups of buildings or shelters adapted to withstand or provide protection against abnormal external influences, e.g. war-like action, earthquake or extreme climate
    • E04H9/02—Buildings, groups of buildings or shelters adapted to withstand or provide protection against abnormal external influences, e.g. war-like action, earthquake or extreme climate withstanding earthquake or sinking of ground
    • E04H9/024—Structures with steel columns and beams
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
    • E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
    • E04B1/18—Structures comprising elongated load-supporting parts, e.g. columns, girders, skeletons
    • E04B1/24—Structures comprising elongated load-supporting parts, e.g. columns, girders, skeletons the supporting parts consisting of metal
    • E04B1/2403—Connection details of the elongated load-supporting parts
    • E04B2001/2406—Connection nodes
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
    • E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
    • E04B1/18—Structures comprising elongated load-supporting parts, e.g. columns, girders, skeletons
    • E04B1/24—Structures comprising elongated load-supporting parts, e.g. columns, girders, skeletons the supporting parts consisting of metal
    • E04B1/2403—Connection details of the elongated load-supporting parts
    • E04B2001/2415—Brackets, gussets, joining plates
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
    • E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
    • E04B1/18—Structures comprising elongated load-supporting parts, e.g. columns, girders, skeletons
    • E04B1/24—Structures comprising elongated load-supporting parts, e.g. columns, girders, skeletons the supporting parts consisting of metal
    • E04B1/2403—Connection details of the elongated load-supporting parts
    • E04B2001/2418—Details of bolting
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
    • E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
    • E04B1/18—Structures comprising elongated load-supporting parts, e.g. columns, girders, skeletons
    • E04B1/24—Structures comprising elongated load-supporting parts, e.g. columns, girders, skeletons the supporting parts consisting of metal
    • E04B1/2403—Connection details of the elongated load-supporting parts
    • E04B2001/2439—Adjustable connections, e.g. using elongated slots or threaded adjustment elements
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
    • E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
    • E04B1/18—Structures comprising elongated load-supporting parts, e.g. columns, girders, skeletons
    • E04B1/24—Structures comprising elongated load-supporting parts, e.g. columns, girders, skeletons the supporting parts consisting of metal
    • E04B1/2403—Connection details of the elongated load-supporting parts
    • E04B2001/2445—Load-supporting elements with reinforcement at the connection point other than the connector
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
    • E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
    • E04B1/18—Structures comprising elongated load-supporting parts, e.g. columns, girders, skeletons
    • E04B1/24—Structures comprising elongated load-supporting parts, e.g. columns, girders, skeletons the supporting parts consisting of metal
    • E04B1/2403—Connection details of the elongated load-supporting parts
    • E04B2001/2448—Connections between open section profiles
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
    • E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
    • E04B1/18—Structures comprising elongated load-supporting parts, e.g. columns, girders, skeletons
    • E04B1/24—Structures comprising elongated load-supporting parts, e.g. columns, girders, skeletons the supporting parts consisting of metal
    • E04B2001/2466—Details of the elongated load-supporting parts
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
    • E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
    • E04B1/38—Connections for building structures in general
    • E04B1/58—Connections for building structures in general of bar-shaped building elements
    • E04B2001/5875—Connections for building structures in general of bar-shaped building elements using exterior clamping plates or shells

Abstract

The invention relates to a self-resetting support assembly type friction connecting node and a performance design method thereof, wherein the connecting node comprises a node plate, a connecting lug plate, a connecting flange, a high-strength bolt and a friction plate; according to the self-resetting support structure, the maximum axial force of the self-resetting support is irrelevant to the maximum stroke through friction sliding connection, the self-resetting support is prevented from transmitting large loads to the connecting node and the main structure when the structure is deformed greatly, a beam column and a node domain of the main structure are protected, meanwhile, the structure is provided with stronger energy consumption capacity, the connecting node is simpler in structure, and the assembly degree is high; the invention realizes easy adjustment of self-resetting support limit axial force, pre-tightening force of the connecting joint, energy consumption capacity, activation force, limit stroke after activation and bearing capacity; the invention also provides a performance design method comprehensively considering the cooperative work of the self-resetting support and the connection node in the whole process, and the method can be directly used for engineering design.

Description

Self-resetting support assembly type friction connection node and performance design method thereof
Technical Field
The invention relates to the technical field of building structure shock absorption and energy consumption, in particular to a self-resetting support assembly type friction connection node and a performance design method thereof.
Background
Earthquake is a sudden natural disaster endangering people's lives and properties. Research has shown that when the residual deformation angle of the structure after earthquake is greater than 0.5%, the maintenance cost is greater than the reconstruction cost. When a building encounters a strong earthquake action higher than the local defense intensity, even if the integral integrity of the structure is kept, the building needs to be reinforced and repaired in a large range due to overlarge deformation and serious damage of partial members, and even can only be overturned for reconstruction, so that huge waste is caused, and the normal life of people is influenced. Therefore, scholars at home and abroad propose 'earthquake-resistant tough buildings' as a main development direction in recent years. The self-resetting support is an important new component which helps the building to realize the anti-seismic toughness function.
The bracing member undergoes the development process from a normal steel bracing to a shock-absorbing bracing with reliable performance represented by a buckling restrained brace to a self-restoring bracing with self-restoring property. The common steel support is easy to buckle when being pressed, the bearing capacity under the pressing is small, the problem of asymmetric tension and compression exists, obvious rigidity degradation occurs when being pulled, low-cycle fatigue failure easily occurs, large residual deformation often exists under the reciprocating load effect, and the anti-seismic performance needs to be improved. Aiming at the defects of the common steel brace, the buckling restrained brace avoids buckling under pressure by additionally arranging peripheral restraint on the energy-consuming inner core, so that tension-compression imbalance is basically eliminated, the energy-consuming capacity under the action of an earthquake is improved, the ductility performance is further improved, but after yielding, the buckling restrained brace cannot be restored to the initial position, and larger residual deformation exists. Thus, researchers have proposed self-resetting braces with resetting capabilities. Self-resetting braces typically include two parts, an energy consuming system that provides energy consuming capabilities and a resetting system that provides self-healing characteristics. The energy dissipation system generally adopts friction energy dissipation or material yield energy dissipation, the reset system adopts prestressed ribs, shape memory alloy or disk springs to provide restoring force, and the parallel operation of the energy dissipation system and the reset system enables the hysteretic response of the support to be in a flag shape. When the stress is small, the rigidity of the support is provided by the force transmission system, the reset system and the energy consumption system together, and the rigidity is called as initial rigidity. When the support stress reaches the sum of the prestress and the friction force or the damping force of the energy consumption system, the force transmission system starts to generate relative displacement and activates the reset and energy consumption system, and the support rigidity is reduced to the rigidity after activation. When the support is unloaded, the restoring system provides restoring force to drive the support to return to the initial position, and the residual deformation is zero. The self-resetting support can only realize complete resetting when the restoring force provided by the resetting system is larger than the friction force or the damping force of the energy consumption system. The self-resetting support has better energy consumption capability and can realize the aim of zero residual displacement.
Various supports need to transmit load to the main structure through supporting the connecting node, and the stress performance of the node domain can be influenced by the support and nearby beams and columns. Therefore, the reasonable design of the supporting connection nodes is very important for the seismic performance of the whole structure. The traditional support connection node has good integrity and strong constraint capability, can reduce the support calculation length to a certain extent, and improves the integral rigidity of the structure. However, due to the strong constraint ability of the nodes, secondary bending moment is generated at the nodes when the support is unstable, the performance of the support cannot be fully exerted, and the difficulty of the nodes in processing and installation is high. The existing design specifications allow the common support to quit working under the action of rare earthquakes, but the self-resetting support still needs to be in a normal working state when the self-resetting support is greatly deformed, the requirement on the performance of the node is higher, and a support connecting node which can fully adapt to the performance characteristics of the self-resetting support needs to be adopted.
For special supports, there are also new forms of connection: in the buckling-restrained brace steel frame fixedly connected with beam column, a gusset plate which is not connected with column but only connected with beam end is adopted[1]The axial force of the support can be converted into axial force, shearing force and bending moment acting on the beam end; novel energy dissipation connecting node adopting U-shaped connection or stud connection[2-4]The energy consumption performance is good; double-gusset-plate buckling-restrained brace connecting joint[5,6]The two gusset plates are connected with the end parts of the buckling-restrained brace through the high-strength bolts, so that the compression stability is better, the out-of-plane bearing capacity is higher, and the size of the gusset plates can be effectively reduced; dry-type flexible beam column consisting of pre-embedded steel beams in concrete column, pre-embedded steel plates at concrete beam ends and connecting platesNode point[7]The column side extends out a section of overhanging steel beam to be connected with the buckling-restrained brace, the overhanging steel beam and the floor slab are connected with the pre-buried steel plate at the concrete beam end by adopting the studs and the friction type high-strength bolts respectively, so that the column has great deformability, and obvious local damage can not occur within the standard allowable interlayer displacement angle limit value.
The implementation scheme similar to the invention is as follows: new sliding joint for clamping sliding end plate between sliding base plate and beam column flange through high-strength bolt[8,9]A layer of low-friction material is arranged between the sliding end plate and the sliding base plate as well as between the sliding end plate and the beam column flange, so that the mutual tangential constraint between the node and the beam column flange can be released, and only the normal constraint between the node and the beam column flange is reserved. The position of the sliding node is kept unchanged in the sliding process, the telescopic deformation of the beam column flange under the action of bending moment generates relative displacement with the sliding end plate, and the high-strength bolt is driven to move together, so that the relative sliding deformation between the beam column flange and the sliding end plate, and between the sliding base plate and the sliding end plate is allowed. This scheme is through providing a take connection node plate of end plate that slides for buckling restrained brace, solves the rigid domain effect that the welding seam that connection node plate exists and connects the rigid domain effect that arouses, beam column calculation length shorten and the structure opens and shuts the effect scheduling problem that the node plate produced, nevertheless because this node can not restrict to support and exert oneself the size, leads to node, near beam column and node domain still can bear great load, has great damage risk.
From the viewpoint of mechanical properties, the prior art has the following disadvantages:
1. the traditional support connection node is large in size and easy to buckle and destabilize in order to meet the strength requirement, and the common steel support is allowed to quit working and buckle and consume energy under the action of rare earthquakes in the design process. The structure and design method of the existing support connection node are not improved aiming at the characteristic that the self-resetting support can still normally play the self anti-seismic performance when the self-resetting support is greatly deformed, and the self-resetting support connection node cannot meet the requirement of high bearing capacity of the self-resetting support. The reliability of the support connecting node directly influences the performance of the anti-seismic performance of the self-resetting support. If the self-resetting support directly adopts the node, the connection with the main structure is not safe and reliable enough, so that the self-resetting support is withdrawn from work in advance.
2. Various new support connecting nodes suitable for special supports mostly belong to rigid nodes, and the integral structure bears the load according to the principle that the larger the rigidity is, the larger the load is; the smaller the rigidity is, the smaller the load is born, and the principle of distributing the load to each structural component results in that the 'rigid' nodes are relatively large in load and easy to break, so that the connection of the support and the main body structure is instantly withdrawn from working, the stress state and the internal force distribution of the whole structure are suddenly changed, and the damage degree is increased steeply.
3. The self-resetting support has a large stroke after activation and a large corresponding support force in order to ensure good energy consumption capacity. The influence of self-reset support is often considered less in the structural member in the design stage, and structural measures for limiting the self-reset support output are lacked, so that under the conditions of heavy earthquake and extra-heavy earthquake, the beam column and the node area near the self-reset support bear larger load, and the damage risk of the main body structure is increased.
4. The structure singly adopts self-resetting support, except utilizing self-resetting support to dissipate seismic energy, mostly depends on main structure materials to enter plastic stage for energy consumption, increases the damage degree of structural members, and improves the subsequent use and maintenance cost of buildings.
From a constructional point of view, the prior art has the following disadvantages:
5. when the existing support connection node realizes the functions of reliable connection of the support and the main structure, the existing support connection node is often connected with the support in a welding mode, so that the node and the support connection interface have initial defects and complex welding stress. These initial defects and weld stresses can lead to brittle failure of the joint and support connection interface when subjected to dynamic loading without reaching the ultimate load capacity.
From the perspective of engineering construction, the prior art has the following disadvantages:
6. the existing self-resetting support is mostly connected with a structure by welding, and the reliability of a welding process is limited by the skills and construction environment of field construction workers. In addition, the nodes and the supports are sequentially installed one by one, which results in long time consumption and low processing and assembling efficiency. If the support connecting node and the self-resetting support are assembled together in a factory, a huge component can be transported to a construction site only after the assembly is completed, and the transportation convenience is reduced.
From a design point of view, the prior art has the following disadvantages:
7. although a plurality of new support connecting nodes applied to special supports appear in recent years, a design method comprehensively considering the cooperative work of the special supports and the support connecting nodes is lacked, and the secondary design and the engineering application of the new support connecting nodes are not facilitated.
The invention provides an assembled self-resetting support connecting node capable of sliding and consuming energy through friction, in particular to a self-resetting support connecting node comprising a high-strength bolt and an energy consumption friction plate, and provides a design method based on performance requirements, wherein the design method can be applied to a self-resetting support structure system. The technical problems that the invention can solve are mainly as follows:
1. in the machining process, more bolts are used for connection, so that the use of welding connection is reduced to the maximum extent, the influence of initial defects and welding stress is reduced, and the performance of the connection node and the self-resetting support connected with the connection node under dynamic load is more stable.
2. The connecting node belongs to flexible connection, bears smaller load under the action of large shock or extra large shock, can effectively avoid the pressure instability of the connecting node, and is in a safe working stage.
3. The high-strength bolt and the friction plate form a reliable connecting interface, so that reliable connection is provided between the main body structure and the self-resetting support adopting the connecting node, and the self-resetting support is prevented from being withdrawn from working in advance due to loss of reliable connection.
4. The friction connection is arranged between the main body structure and the self-resetting support, so that when the support force reaches the maximum static friction force, the connection part slides relatively, the load transmitted to the connection node and the beam column by the self-resetting support is not increased any more no matter how large the self-resetting support bears, and the self-resetting support is always limited in an expected controllable range, so that the main body structure is protected.
5. The connecting node of the energy dissipation friction plate is adopted, so that the seismic energy is dissipated after the friction plate slides, self-reset support energy dissipation is assisted, and multiple energy dissipation modes work in a cooperative mode.
6. The connecting node has simple structure and high assembly degree. The connecting node is formed by assembling a plurality of assembling bodies, the assembling bodies can be simultaneously processed and transported to a construction site for integral assembly, and the production and construction efficiency is greatly improved.
7. The rigidity of the connecting joint, the activation force and the activation displacement can be adjusted by changing the pretightening force of the bolt, the type of the friction slip surface and the like under the condition of ensuring reliable force transmission.
8. The connecting node is suitable for a self-resetting support structure system, and provides a design method for meeting the performance requirement of cooperative work with self-resetting support.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a self-resetting support assembled friction connecting node, and provides a performance design method considering the cooperative work of the self-resetting support and the connecting node, and the method has the following advantages:
1. the connection node aims to provide reliable connection for the self-resetting support and the main structure, mechanical characteristics of the self-resetting support and the reliability of the connection node are fully considered in design, and in practical application, the self-resetting support can be prevented from being withdrawn from work in advance and can be always assisted to fully exert self anti-seismic performance.
2. The connecting node provided by the invention provides a safe and reliable connecting effect, and meanwhile, the connecting node is in a flexible connection by adopting a reasonable construction measure, and the load obtained by transmission is always in a safe and controllable range.
3. The limit bracing force after the self-resetting bracing is activated can be free from the influence of the bracing limit stroke through a special structure, and the load transmitted to the nearby beam column and node domain from the self-resetting bracing is limited.
4. The high-strength bolt with stable performance is adopted for connection, friction materials are adopted for energy consumption, the high-strength bolt has good energy consumption capability, and can dissipate seismic energy together with the self-resetting support to form a cooperative energy consumption mechanism of self-resetting support-connection node-main body structure.
5. And high-strength bolts are adopted for connection in the installation process, so that the adverse effect caused by a welding process is greatly reduced.
6. The combined type combined assembly is composed of the assembly bodies, the sub-assembly bodies can be processed and assembled at the same time, and then the sub-assembly bodies are conveyed to a construction site for integral assembly, and the combined type combined assembly has the advantages of being efficient and convenient in actual production. After the earthquake, the failed parts can be replaced according to the actual damage condition, so that the repair cost is saved, the repair time is shortened, and the function recovery is realized.
7. A performance design method comprehensively considering the cooperative work of the self-resetting support and the connecting node is provided. In addition, when the structure is subjected to secondary design and the design parameters of the connection nodes need to be changed, the number and the pretightening force of the high-strength bolts, the friction sliding material, the number and the thickness of the node plates and the like are changed according to the performance requirements under the condition of reliable stress.
In order to achieve the above purposes, the technical scheme adopted by the invention is as follows:
in one aspect, a self-resetting bracing fabricated friction coupling node, comprising: the connecting structure comprises a plurality of node plates 3, connecting lug plates, connecting flanges 6, a plurality of high-strength bolts 7 and a plurality of friction plates 8;
the connection lug plate includes: two outer connecting ear plates 4 and a plurality of inner connecting ear plates 5;
the outer connecting lug plate 4 and the inner connecting lug plate 5 are both in a T shape, holes are formed in the long side part perpendicular to the short side part according to the size, the number and the interval of the high-strength bolts 7, and a plurality of bolt holes are formed in two sides of the short side part;
the inner side surface of the outer connecting ear plate 4 is contacted with the gusset plate 3, a square groove capable of being embedded with the friction plate 8 is formed in the inner side surface of the outer connecting ear plate 4, and the square groove is positioned between two rows of holes in the inner side surface of the outer connecting ear plate 4;
two side surfaces of the inner connecting lug plate 5 are both contacted with the node plate 3, and two side surfaces of the inner connecting lug plate 5 are both provided with a square groove which is positioned between two rows of holes on the side surface of the inner connecting lug plate 5;
the two outer connecting lug plates 4 are symmetrically arranged on two sides of the plurality of node plates 3, and the plurality of inner connecting lug plates 5 are sequentially arranged among the plurality of node plates 3;
a plurality of long slotted holes are formed in the central area of each gusset plate 3 according to the arrangement rows of the high-strength bolts 7, so that a fixed sliding path is provided;
the high-strength bolts 7 are sequentially connected along the axial direction as required;
the connecting flange 6 is connected with the short side parts of the outer connecting lug plate 4 and the inner connecting lug plate 5 through bolts, and the other side of the connecting flange is hinged with the self-resetting support.
On the basis of the scheme, the gusset plate 3 is connected with the frame beam 1 and the frame column 2 in a welding seam or bolt mode.
On the basis of the scheme, the centers of the openings of each row on the outer connecting lug plate 4 and the inner connecting lug plate 5 are aligned with the centers of the long slotted holes of the node plates 3.
On the basis of the above scheme, the connection mode of the connection lug plate and the gusset plate 3 is as follows: the term "outer connecting lug plate 4-gusset plate 3-outer connecting lug plate 4", or "outer connecting lug plate 4-gusset plate 3-inner connecting lug plate 5-gusset plate 3-inner connecting lug plate 5-gusset plate 3-outer connecting lug plate 4", and so on.
On the basis of the scheme, the parts for providing the pre-pressure for the friction plate 8 are not limited to the high-strength bolt 7, and can also adopt the forms of a common bolt, a prestressed rib and the like.
On the basis of the above scheme, the long side portion of the connecting ear plate is not limited to be rectangular, and may also be in a shape enclosed by a smooth curve, such as a semicircular shape.
On the basis of the scheme, the friction plate 8 is made of brass or asbestos-free organic matters, and can be made of a proper friction material selected from rubber base, paper base, resin base, carbon fiber and semimetal.
On the basis of the scheme, the high-strength bolt 7 can be made of 45 steel, 40B steel and 20MnTiB steel materials through heat treatment.
On the basis of the scheme, the high-strength bolt 7 can apply pre-tightening force by screwing the nut, and the pre-tightening force can be applied by a torque method, a corner method and a torsional shear method.
On the basis of the above scheme, the connection between the connecting lug plate and the connecting flange 6 can be selected from, but not limited to, bolt connection, and other types of connection such as welding can also be adopted.
On the basis of the scheme, the connection mode of the whole connecting node and the self-resetting support can be selected from but not limited to the connecting flange 6, and the modes of combining a steel plate with a pin bolt, combining a steel plate with a bolt and the like can also be adopted.
On the basis of the scheme, the mode of limiting the maximum self-resetting support force is not limited to the coulomb friction force, and adjustable pressure, adjustable magnetic force and the like can also be adopted.
On the other hand, a performance design method, based on the above connection node, specifically includes:
determining an activation displacement and an activation force of the connection node: the connecting node is later than self-resetting support activation, slides right when the connecting node reaches activation displacement and overcomes the maximum static friction force of all sliding connecting interfaces, and is represented as follows:
μ0<μmac<μmax (1)
Fac＝K1μ0+K2(μac-μ0)＝2nfmax (2)
in the formula: mu.s0An activating displacement for a self-resetting support; mu.sacDetermining the activated displacement of the connecting node according to the earthquake-resistant requirement of the building structure; mu.smaxDetermining the ultimate displacement of the connecting node according to the earthquake-resistant requirement of the building structure; facThe self-resetting support is used for supporting the axial force when the connecting node is activated; k1A first stiffness that is a self-resetting support; k2A second stiffness that is a self-resetting support; n is the number of the node plates, and 2n is the number of the sliding connection interfacesAn amount; f. ofmaxFor maximum static friction force per slip joint interface, 2nfmaxThe maximum static friction force of all slip connection interfaces is the sum;
designing the size of the gusset plate: the method for checking and calculating the stress of the connecting edge of the connecting node by adopting a simplified method specifically comprises the following steps: the connecting edges of the beam side gusset plate and the column side gusset plate respectively bear the axial force F of the self-resetting support in the step when the connecting node is activatedacThe horizontal component and the vertical component of (a), expressed as:
Figure BDA0003402878420000081
Figure BDA0003402878420000082
in the formula: l isbThe length of the beam side gusset plate; l iscThe length of the column side gusset plate; lambda [ alpha ]nThe gain coefficient of the connecting node for n node plate pairs is increased along with the increase of the number n of the node plates;
Figure BDA0003402878420000091
is a horizontal included angle of the self-resetting support axis; t is the thickness of a single gusset plate; f. ofvDesigning a shear strength design value for the gusset plate;
calculating high-strength bolt parameters: all high-strength bolts provide proper pretightening force for the sliding connection interface, so that the connection joint is ensured to slide according to the expectation, which is represented as:
ξmP＝2nfmax (5)
in the formula, xi is the friction coefficient of the friction plate; m is the number of high-strength bolts; p is a pre-tightening force value of the high-strength bolt, and the value is referred to steel structure high-strength bolt connection technical specification, and the nominal diameter d of the screw is obtained;
on the premise of meeting the requirements of reasonable stress and economy, the values of the number n of the gusset plates, the thickness t of the gusset plates, the number m of the high-strength bolts and the nominal diameter d are further optimized.
Compared with the prior art, the invention has the beneficial effects that:
1. in the prior art, the tangential constraint between the gusset plate and the beam column is released by utilizing the sliding interface of the low-friction material, so that the influence of the common gusset plate opening and closing effect of the buckling restrained brace connecting node is weakened, and energy consumption is not carried out by utilizing the friction material; the friction plates are adopted to realize energy consumption and slippage, the connection nodes with the activation force and the stroke meeting the design requirement after activation are configured through superposition of the friction plates, the friction is used as a method for controlling the limit axial force of the self-resetting support in the structure, and the friction plates can be used for multiple times.
2. In the prior art, the constraints of the support connecting node and the main structure are weakened so as to protect nearby beams and columns and node areas, but the force transmitted to the support connecting node by the buckling restrained brace is not limited; the self-resetting support realizes the independence of the limit axial force and the limit stroke of the self-resetting support through friction sliding connection, and avoids the self-resetting support from transmitting large load to the connecting node and the main structure when the structure is deformed greatly.
3. In the prior art, only the influence of the ultimate axial force of the buckling restrained brace on the node is considered during design; the invention also provides a performance design method comprehensively considering the cooperative work of the self-resetting support and the connection node in the whole process, and the method can be directly used for engineering design.
4. In the prior art, bolts are arranged at the connecting parts of the gusset plates and the beam columns, and once the beam columns are damaged by the screw rods, the difficulty of later-stage repair is great; according to the connecting joint, the high-strength bolts are arranged on the joint plate and the connecting lug plate, even if the damage of the connecting joint influences the normal use, the original functions of the structure can be quickly recovered by replacing parts in the connecting joint, the later maintenance time and cost are greatly reduced, people can be helped to recover the normal life, and the subsequent negative influence caused by an earthquake is reduced.
5. The invention has simpler structure, high assembly degree and small size error of parts during factory processing, is convenient for assembly to a construction site in a construction period, accelerates the construction progress and reduces the pollution degree to the environment around the structure; even if the earthquake and the extra-large earthquake occur, the self-reset support, the connecting node and the main structure are well protected, and the service life of the structural member and the building structure is indirectly prolonged.
6. The invention realizes easy adjustment of self-resetting support limit axial force, activation force of the connecting node and the limit stroke after activation. When the performance requirements of the connection nodes are changed due to the fact that the building structure containing the energy-saving energy-.
Drawings
The invention has the following drawings:
FIG. 1 is a schematic structural diagram of a connection node according to the present invention;
FIG. 2 is a schematic view of the combination of the connecting ear plate and the friction plate;
FIG. 3 is a schematic view of a gusset plate;
FIG. 4 is a schematic view of the outer side of the outer connecting ear plate;
FIG. 5 is a schematic view of the inside face of the outer connecting ear plate;
FIG. 6 is a side view of an external attachment lug;
FIG. 7 is a top view of an external connection lug;
FIG. 8 is a schematic view of one side of an inner connecting ear plate;
FIG. 9 is a schematic view of the other side of the inner connecting ear plate;
FIG. 10 is a side view of an inner attachment lug;
FIG. 11 is a top view of an inner connecting ear plate;
FIG. 12 is a schematic view of a coupling flange;
reference numbers in the figures: 1-a frame beam; 2-frame columns; 3-gusset plate; 4-external connection ear plate; 5-inner connecting ear plate; 6-connecting a flange; 7-high strength bolts; 8-friction plate.
Detailed Description
The present invention is described in further detail below with reference to figures 1-12.
The invention provides a self-resetting support assembly type friction connecting node by utilizing the energy consumption capability of a friction material, which mainly comprises: the node plate 3, the outer connecting lug plate 4, the inner connecting lug plate 5, the connecting flange 6, the high-strength bolt 7 and the friction plate 8. The gusset plate 3, the outer connecting lug plate 4, the inner connecting lug plate 5, the connecting flange 6 and the friction plate 8 can be processed and assembled at the same time, and then are connected into the whole gusset through the high-strength bolt 7.
The following will describe in detail the embodiments of the present invention in terms of the order of processing and assembly.
Taking a node with three gusset plates 3 as an example, as shown in fig. 1. The outer and inner engaging lugs 4 and 5 are required to be fitted with friction plates 8 in the square grooves, as shown in fig. 2. In the whole assembling process of the node, the node plate 3 is sandwiched between the long side portions of the pair of connection lug plates (including the outer connection lug plate 4 and the inner connection lug plate 5), and it is noted that the positions of the openings of the connection lug plates (including the outer connection lug plate 4 and the inner connection lug plate 5) and the positions of the long slot holes of the node plate 3 are aligned, and the center of the opening of each row of the connection lug plates (including the outer connection lug plate 4 and the inner connection lug plate 5) is aligned with the center of the long slot hole of the node plate 3. And then, the high-strength bolt 7 is used for sequentially connecting the outer connecting lug plate 4, the node plate 3, the inner connecting lug plate 5, the node plate 3 and the outer connecting lug plate 4 along the axial direction, and a torque wrench is needed to apply expected pre-tightening force to the high-strength bolt 7 during installation. The short side portions of all the connecting lugs (including the outer connecting lug 4 and the inner connecting lug 5) are bolted to the connecting flange 6. So far, the whole node is basically assembled.
In the field assembly process of the building structure, the gusset plate 3 of the whole connecting node is connected with the frame beam 1 and the frame column 2 in a welding seam or bolt mode, and the self-resetting support is connected with the connecting flange 6 through a pin bolt. Self-resetting bracing-the connection node of the invention-the body structure system is assembled.
The working principle of the invention is as follows:
for convenience of explanation, the self-resetting support is described by taking the example of tension, and the working principle is the same when the support is pressed.
The high-strength bolt 7 provides normal pre-pressure for the friction plate 8. In the use stage, after the self-resetting support is activated, the axial force is gradually increased, and the connecting node is stressed as a whole; when the self-resetting support shaft force is transmitted to the connecting ear plate (comprising the outer connecting ear plate 4 and the inner connecting ear plate 5) through the connecting flange 6, the connecting ear plate (comprising the outer connecting ear plate 4 and the inner connecting ear plate 5) overcomes the maximum static friction force (namely the activating force of the connecting joint of the invention) of the friction plate 8 between the connecting ear plate and the node plate 3, the friction plate 8 slides, namely the node plate 3 and the connecting ear plate (comprising the outer connecting ear plate 4 and the inner connecting ear plate 5) slide relatively, the friction plate 8 consumes energy, the high-strength bolt 7 slides along the long slotted hole of the node plate 3, and at the moment, the self-resetting support force and the load transmitted to the accessory beam column and the node area are kept unchanged; when the axial force of the self-resetting support begins to be reduced to be smaller than the maximum static friction force of the friction plate 8, the friction plate 8 does not move relatively any more, the node plate 3 and the connecting lug plates (including the outer connecting lug plate 4 and the inner connecting lug plate 5) restore to a relatively static state, and the connecting node restores to an overall stress state.
The invention provides a method for calculating various design parameters of a connecting node based on a performance design method, which comprises the following implementation processes:
1. determining the activation displacement and the activation force of the connection node of the invention: the connecting node is later than self-resetting support activation, slides right when the connecting node reaches activation displacement and overcomes the maximum static friction force of all sliding connecting interfaces, and can be expressed as follows:
μ0<μmac<μmax (1)
Fac＝K1μ0+K2(μac-μ0)＝2nfmax (2)
in the formula: mu.s0An activating displacement for a self-resetting support; mu.sacThe activation displacement of the connection node is determined according to the earthquake-resistant requirement of the building structure; mu.smaxDetermining the ultimate displacement of the connecting node according to the earthquake-resistant requirement of the building structure; facThe self-resetting support is used for supporting the axial force when the connecting node is activated; k1A first stiffness that is a self-resetting support; k2A second stiffness that is a self-resetting support; n is the number of gusset plates, 2n isThe number of slip joint interfaces; f. ofmaxFor maximum static friction force per slip joint interface, 2nfmaxIs the sum of the maximum static friction forces of all slip joint interfaces.
2. Designing the size of the gusset plate: the stress of the joint connecting edge is checked and calculated by adopting a simplified method, namely the connecting edges of the beam side and column side joint plates respectively bear the self-resetting supporting axial force F in the step 1acThe horizontal component and the vertical component of (c) can be expressed as:
Figure BDA0003402878420000131
Figure BDA0003402878420000132
in the formula: l isbThe length of the beam side gusset plate; l iscThe length of the column side gusset plate; lambda [ alpha ]nThe gain coefficient of the connection node of the invention for n node plates is increased along with the increase of the number n of the node plates;
Figure BDA0003402878420000133
is a horizontal included angle of the self-resetting support axis; t is the thickness of a single gusset plate; f. ofvDesign values for the shear strength of the gusset plate.
3. Calculating high-strength bolt parameters: all high-strength bolts provide proper pre-tightening force for the sliding connection interface, so as to ensure that the connection node slides as expected, which can be expressed as:
ξmP＝2nfmax (5)
in the formula, xi is the friction coefficient of the friction plate; m is the number of high-strength bolts; and P is the pre-tightening force value of the high-strength bolt, and the value is referred to steel structure high-strength bolt connection technical specification, and the nominal diameter d of the screw is obtained.
4. On the premise of meeting the requirements of reasonable stress and economy, the values of the number n of the gusset plates, the thickness t of the gusset plates, the number m of the high-strength bolts and the nominal diameter d are further optimized.
The key points and points to be protected of the invention are as follows:
1. by adopting the method of bolt connection, the adverse effect brought by welding connection is reduced.
2. The rigidity of the connecting node is small, the bearing load is within a controllable range, and the connecting node is always in a reliable working state.
3. The self-resetting support is provided with reliable connection, and the self-resetting support is ensured not to be withdrawn from work in advance because of losing contact with the main structure.
4. The reliable sliding connection interface formed by the high-strength bolts and the friction plates in the connection node limits the load transferred to nearby beams, columns and node areas from the self-resetting support, and has a certain protection effect on the main structure.
5. And the friction plate is adopted to realize stable energy consumption.
6. And multiple energy-consumption defense lines work in a cooperative manner, so that the energy-consumption surplus degree and the safety degree of the whole structure are improved.
7. Each part in the connecting node is simple in structure, can be processed and installed at the same time, improves production efficiency, is finally integrally assembled with the self-resetting support and the main structure, and is convenient for post-earthquake repair.
8. The friction sliding connection is adopted, so that the limit axial force and the limit stroke of the self-resetting support during the operation of the integral structure can be respectively designed.
9. Design parameters such as the pretightening force of the high-strength bolt, the friction force of the friction plate and the like are easy to adjust.
10. The self-resetting support and the cooperative work of the connecting node are comprehensively considered, and a connecting node design method based on performance requirements is provided, so that engineering application is facilitated.
Interpretation of terms:
initial stiffness: the self-resetting support has small deformation, the resetting device is not activated, and the damping device does not consume energy, so that the axial rigidity of the component is improved.
Stiffness after activation: after the resetting device and the damping device of the self-resetting support are activated, the axial rigidity of the component is lower than the initial rigidity after the component is activated.
Activation force: during the self-resetting support loading process, when the initial rigidity is changed into the rigidity after activation, the axial force of the component is generated.
Ultimate bearing capacity: the axial force of the component is loaded when the self-resetting support is damaged.
Resetting capability: the ability of the self-resetting support to return to an initial state after deformation.
Energy consumption capacity: the ability of the self-resetting support to dissipate energy through the damping device during deformation.
Supporting the connecting node: the support and the nodes connected with the nearby beams and columns can be used as a whole to bear load together with the main structure.
And (3) node activation: the phenomenon that the connecting lug plate and the node plate are converted from a relative static state to a relative motion state is avoided.
Maximum static friction force: when the connecting node is activated, the static friction force between the friction plates reaches the maximum value.
Reference documents:
[1]Berman J W,Bruneau M.Cyclic Testing of a Buckling Restrained Braced Frame with UnconstrainedGusset Connections[J].Journal of Structural Engineering,2009,135(12):1499-1510.
[2]Vayas I,Thanopoulos P,Castiglioni C,et al.Behaviour of seismic resistant braced frames withinnovative dissipative(INERD)connections[C]//Proceedings of the 4th European Conference on Steeland Composite Structures-Euro-steel.2005:8-10.
[3]Plumier A,Doneux C,Castiglioni C,et al.Two I nnovations for Earthquake Resistant Design:TheINERD Project[M].2006.
[4]Tirca L,Caprarelli C,Danila N,et al.MODELLIN G AND DESIGN OF DISSIPATIVECONNECTIONS FOR BRACE-TO-COLUMN JOINTS[C]//7th Int.Workshop on connections in steelstructures,Timisoara.2012:503-514.
[5]Chou CC,Liu JH,Pham DH.Steel Buckling-Restrained Braced Frames with Single and Dual CornerGusset Connections:Seismic Tests and Analyses[J].Earthquake Engineering and Structural Dynamics(2011),DOI:10.1002/eqe.1176.
[6]Chou C C,Liou G S,Yu J C.Compressive behavior of dual-gusset-plate connections for buckling-restrainedbraced frames[J].Journal of Constructional Steel Research,2012,76(none):54-67.
[7] the experimental research on the dry flexible beam column node of the reinforced concrete frame structure with buckling restrained support [ J ] engineering mechanics, 2018,35(06):151 + 161.
[8] The anti-seismic performance and design method of the anti-seismic performance of the anti-buckling support steel frame node based on the sliding connection [ D ]. university of south China, 2019.
[9]Zhao J,Haichao Y U,Pan Y,et al.Seismic performance of sliding gusset connections in buckling-restrainedbraced steel frame[J].JianzhuJiegouXuebao/Journal of Building Structures,2019.
Those not described in detail in this specification are within the skill of the art.

Claims (5)

1. A self-resetting bracing fabricated friction coupling node, comprising: the connecting device comprises a plurality of node plates (3), connecting lug plates, connecting flanges (6), a plurality of high-strength bolts (7) and a plurality of friction plates (8);
the connection lug plate includes: two external connecting ear plates (4) and a plurality of internal connecting ear plates (5);
the outer connecting lug plate (4) and the inner connecting lug plate (5) are T-shaped, long-side parts perpendicular to the short-side parts are provided with holes according to the size, the number and the interval of the high-strength bolts (7), and two sides of the short-side parts are provided with a plurality of bolt holes;
the inner side surface of the outer connecting lug plate (4) is in contact with the gusset plate (3), a square groove capable of being embedded with the friction plate (8) is formed in the inner side surface of the outer connecting lug plate (4), and the square groove is positioned between two rows of holes in the inner side surface of the outer connecting lug plate (4);
two side surfaces of the inner connecting lug plate (5) are in contact with the node plate (3), square grooves are formed in the two side surfaces of the inner connecting lug plate (5), and the square grooves are located between two rows of holes in the side surfaces of the inner connecting lug plate (5);
the two outer connecting lug plates (4) are symmetrically arranged on two sides of the plurality of node plates (3), and the plurality of inner connecting lug plates (5) are sequentially arranged among the plurality of node plates (3);
the central area of each gusset plate (3) is provided with a plurality of long slotted holes according to the arrangement row number of the high-strength bolts (7) so as to provide a fixed sliding path;
the high-strength bolts (7) are sequentially connected along the axial direction as required;
the connecting flange (6) is connected with the short edge parts of the outer connecting lug plate (4) and the inner connecting lug plate (5) through bolts, and the other side of the connecting flange is hinged with the self-resetting support.
2. Self-resetting bracing fabricated friction joint according to claim 1, characterized in that the gusset plate (3) is connected with the frame beam (1) and the frame column (2) by means of a weld or bolt.
3. Self-resetting bracing fabricated friction joint according to claim 1, characterized in that the centre of the opening of each row on the outer (4) and inner (5) connection lugs is aligned with the centre of the slotted hole of the joint plate (3).
4. Self-resetting bracing assembly friction joint according to claim 1, characterized in that the connection lug and the joint plate (3) are connected in such a way that: "external connection ear plate (4) -gusset plate (3) -external connection ear plate (4)", or "external connection ear plate (4) -gusset plate (3) -internal connection ear plate (5) -gusset plate (3) -external connection ear plate (4)", and so on.
5. A performance design method, based on the connection node of any one of claims 1 to 4, specifically comprising:
determining an activation displacement and an activation force of the connection node: the connecting node is later than self-resetting support activation, slides right when the connecting node reaches activation displacement and overcomes the maximum static friction force of all sliding connecting interfaces, and is represented as follows:
μ0<μmac<μmax (1)
Fac＝K1μ0+K2(μac-μ0)＝2nfmax (2)
in the formula: mu.s0An activating displacement for a self-resetting support; mu.sacDetermining the activated displacement of the connecting node according to the earthquake-resistant requirement of the building structure; mu.smaxDetermining the ultimate displacement of the connecting node according to the earthquake-resistant requirement of the building structure; facThe self-resetting support is used for supporting the axial force when the connecting node is activated; k1A first stiffness that is a self-resetting support; k2A second stiffness that is a self-resetting support; n is the number of the node plates, and 2n is the number of the sliding connection interfaces; f. ofmaxFor maximum static friction force per slip joint interface, 2nfmaxThe maximum static friction force of all slip connection interfaces is the sum;
designing the size of the gusset plate: the method for checking and calculating the stress of the connecting edge of the connecting node by adopting a simplified method specifically comprises the following steps: the connecting edges of the beam side gusset plate and the column side gusset plate respectively bear the axial force F of the self-resetting support in the step when the connecting node is activatedacThe horizontal component and the vertical component of (a), expressed as:
Figure FDA0003402878410000021
Figure FDA0003402878410000022
in the formula: l isbThe length of the beam side gusset plate; l iscThe length of the column side gusset plate; lambda [ alpha ]nThe gain coefficient of the connecting node for n node plate pairs is increased along with the increase of the number n of the node plates;
Figure FDA0003402878410000023
is a horizontal included angle of the self-resetting support axis; t is the thickness of a single gusset plate; f. ofvShear resistant for gusset plateStrength design value;
calculating high-strength bolt parameters: all high-strength bolts provide proper pretightening force for the sliding connection interface, so that the connection joint is ensured to slide according to the expectation, which is represented as:
ξmP＝2nfmax (5)
in the formula, xi is the friction coefficient of the friction plate; m is the number of high-strength bolts; p is a pre-tightening force value of the high-strength bolt, and the value is referred to steel structure high-strength bolt connection technical specification, and the nominal diameter d of the screw is obtained;
on the premise of meeting the requirements of reasonable stress and economy, the values of the number n of the gusset plates, the thickness t of the gusset plates, the number m of the high-strength bolts and the nominal diameter d are further optimized.
CN202111504718.0A 2021-12-10 2021-12-10 Self-resetting support assembly type friction connection node and performance design method thereof Pending CN114232794A (en)

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CN209429304U (en) * 2018-12-17 2019-09-24 江苏蓝科减震科技有限公司 A kind of double rank sliding friction dampers of brace type
CN111535469A (en) * 2020-07-07 2020-08-14 湖南大学 Self-resetting support with energy consumption time sequence characteristics and assembling method thereof
CN212613073U (en) * 2020-04-02 2021-02-26 西安建筑科技大学 Assembled is from restoring to throne beam column node with pre-compaction dish spring group

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105839968A (en) * 2016-05-19 2016-08-10 华南理工大学 Connecting node plate with sliding end plate for buckling-restrained brace
CN106812366A (en) * 2017-03-05 2017-06-09 北京工业大学 A kind of assembled Self-resetting energy dissipation brace structure
CN107268825A (en) * 2017-08-23 2017-10-20 陈云 Self-resetting beam column friction energy-dissipating node
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