CN108643669B - Top-bottom variable friction energy consumption self-resetting prestressed concrete beam column joint device - Google Patents

Top-bottom variable friction energy consumption self-resetting prestressed concrete beam column joint device Download PDF

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Publication number
CN108643669B
CN108643669B CN201810337378.9A CN201810337378A CN108643669B CN 108643669 B CN108643669 B CN 108643669B CN 201810337378 A CN201810337378 A CN 201810337378A CN 108643669 B CN108643669 B CN 108643669B
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friction
precast concrete
steel plates
concrete beam
column
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CN108643669A (en
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黄林杰
周臻
左春丽
章梦霞
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Southeast University
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Southeast University
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    • EFIXED CONSTRUCTIONS
    • E04BUILDING
    • E04HBUILDINGS OR LIKE STRUCTURES FOR PARTICULAR PURPOSES; SWIMMING OR SPLASH BATHS OR POOLS; MASTS; FENCING; TENTS OR CANOPIES, IN GENERAL
    • E04H9/00Buildings, or groups of buildings, or shelters adapted to withstand or provide protection against abnormal external influences, e.g. war-like action, earthquake, extreme climate
    • E04H9/02Buildings, or groups of buildings, or shelters adapted to withstand or provide protection against abnormal external influences, e.g. war-like action, earthquake, extreme climate withstanding earthquake or sinking of ground
    • E04H9/021Bearing, supporting or connecting constructions specially adapted for such buildings
    • EFIXED CONSTRUCTIONS
    • E04BUILDING
    • E04BGENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
    • E04B1/00Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
    • E04B1/18Structures comprising elongated load-supporting parts, e.g. columns, girders, skeletons
    • E04B1/20Structures comprising elongated load-supporting parts, e.g. columns, girders, skeletons the supporting parts consisting of concrete, e.g. reinforced concrete, or other stonelike material
    • E04B1/21Connections specially adapted therefor
    • E04B1/215Connections specially adapted therefor comprising metallic plates or parts
    • EFIXED CONSTRUCTIONS
    • E04BUILDING
    • E04HBUILDINGS OR LIKE STRUCTURES FOR PARTICULAR PURPOSES; SWIMMING OR SPLASH BATHS OR POOLS; MASTS; FENCING; TENTS OR CANOPIES, IN GENERAL
    • E04H9/00Buildings, or groups of buildings, or shelters adapted to withstand or provide protection against abnormal external influences, e.g. war-like action, earthquake, extreme climate
    • E04H9/02Buildings, or groups of buildings, or shelters adapted to withstand or provide protection against abnormal external influences, e.g. war-like action, earthquake, extreme climate withstanding earthquake or sinking of ground
    • E04H9/025Structures with concrete columns

Abstract

The invention discloses a top-bottom variable friction energy dissipation self-resetting prestressed concrete beam column joint device which comprises a precast concrete column, a precast concrete beam positioned on one side of the precast concrete column and a variable friction energy dissipater for connecting the precast concrete column and the precast concrete beam into a whole, wherein the variable friction energy dissipater comprises a middle friction steel plate with a bending surface, an outer friction steel plate with the bending surface and an inner friction steel plate connected to the precast concrete beam. The invention can reduce the high-order modal effect of the structure, improve the energy consumption capability of the structure under the action of earthquake, eliminate or reduce the residual deformation of the prefabricated reinforced concrete structure under the action of earthquake, and avoid obvious plastic deformation of main structural members such as the prefabricated beam column and the like.

Description

Top-bottom variable friction energy consumption self-resetting prestressed concrete beam column joint device
Technical Field
The invention belongs to the field of civil engineering, and relates to a top-bottom variable friction energy consumption self-resetting prestressed concrete beam-column joint device.
Background
Earthquakes cause extremely serious disasters to human beings. The traditional anti-seismic design adopts a ductility design method, namely, under the action of an earthquake, a structural part is subjected to yielding and destruction in advance, but the whole structure does not lose functions, and most of seismic energy is dissipated by means of plastic deformation after the structural part is subjected to yielding, so that the purpose of ensuring the safety of a main body structure is achieved. Although the traditional design method based on bearing capacity has certain reliability in the aspect of avoiding damage and even collapse of a building to cause casualties, economic loss caused by earthquakes cannot be effectively controlled in medium-intensity earthquakes or strong earthquakes, and after most of the earthquakes, the structure cannot be repaired or used continuously, but can only be overturned for reconstruction. In recent years, the self-resetting precast prestressed concrete frame structure capable of restoring functions can protect lives and properties of people when an earthquake occurs, has small residual displacement after the earthquake, is favorable for repair, and gradually develops into a novel frame structure based on performance earthquake engineering research. At present, energy dissipaters adopted by self-resetting precast concrete frame joints mainly comprise yield energy dissipaters and friction energy dissipaters. Although the overall initial lateral stiffness of the structure is large, the structure only has single starting force, once the energy dissipater is subjected to yielding or friction starting, the beam-column joint gap is opened, the lateral stiffness of the structure is mainly provided by the stiffness of the prestressed tendons, and the structural stiffness is obviously reduced. Under the action of strong shock, the interlayer rigidity is greatly weakened, the self-resetting precast concrete structure is easy to generate obvious high-order modal effect, the structural deformation is easy to concentrate, the local floor displacement angle is large, the damage of non-structural members is increased, and the post-shock resetting capability of the structure is also influenced.
Disclosure of Invention
The technical problem is as follows: the invention provides a top-bottom variable friction energy consumption self-resetting prestressed concrete beam-column joint device which can consume energy under the action of an earthquake, eliminate or reduce residual deformation of a prefabricated reinforced concrete structure under the action of the earthquake, and avoid obvious plastic deformation of main structural members such as a prefabricated beam-column and the like.
The technical scheme is as follows: the invention relates to a top-bottom variable friction energy consumption self-resetting prestressed concrete beam column joint device, which comprises a precast concrete column, a precast concrete beam positioned on one side of the precast concrete column, an upper variable friction energy dissipater and a lower variable friction energy dissipater, wherein the upper variable friction energy dissipater and the lower variable friction energy dissipater are used for connecting the precast concrete column and the precast concrete beam into a whole, the variable friction energy dissipater comprises two middle friction fixing plates connected to the side surface of the precast concrete column, a middle friction connecting plate used for connecting the two middle friction fixing plates into a whole, two middle friction steel plates connected to the middle friction connecting plate and provided with friction bolt holes, two inner friction steel plates connected to the precast concrete beam and provided with friction bolt holes, and two inner friction end plates used for connecting the two inner friction steel plates into a whole, the two inner friction steel plates are symmetrically arranged on two sides of the top of, the two outer friction steel plates are respectively arranged on the outer sides of the inner friction steel plates, a base plate is arranged in a partial area between the inner friction steel plates and the outer friction steel plates, the inner friction steel plates, the outer friction steel plates, the base plates and the precast concrete beam are connected into a whole through pressure-bearing high-strength bolts, the middle friction steel plates are arranged in the rest areas between the outer friction steel plates and the inner friction steel plates, the outer friction steel plates, the middle friction steel plates, the inner friction steel plates and the precast concrete beam are connected into a whole through the friction-bearing high-strength bolts, the inner friction end plates are adjacent to the middle friction connecting plates, the opposite side faces of the outer friction steel plates and the middle friction steel plates are arranged into undulating surfaces, and. And transverse prestressed tendons penetrating through the precast concrete column and the precast concrete beam are arranged in the precast concrete column and the precast concrete beam.
Furthermore, in the device, a friction plate is embedded between the middle friction steel plate and the inner friction steel plate in the variable friction energy dissipater.
Furthermore, in the device, the first friction bolt hole reserved on the precast concrete beam, the second friction bolt hole on the inner friction steel plate and the fourth friction bolt hole on the outer friction steel plate have the same aperture, and are smaller than the aperture of the third friction bolt hole on the middle friction steel plate.
Furthermore, in the device, the pressure-bearing type high-strength bolt penetrates through a first fixing bolt hole formed in the outer friction steel plate, a second fixing bolt hole formed in the base plate and a third fixing bolt hole formed in the inner friction steel plate and then is connected and fixed with the precast concrete beam, and the friction type high-strength bolt penetrates through a fourth friction bolt hole, a third friction bolt hole and a second friction bolt hole and then is connected and fixed with the precast concrete beam.
Furthermore, in the device, the middle friction fixing plate is fixed on the side surface of the precast concrete column through the shear-resistant stud.
Furthermore, in the device, the prestressed tendons are arranged in transverse tendon-penetrating holes reserved on the precast concrete columns and the precast concrete beams.
The node device is based on the close fusion of variable friction energy consumption and prestress reset, and the basic principle is as follows: the variable friction energy dissipater realizes two-stage starting and rigidity change after starting by using the change of friction pretightening force, controls a high-order modal effect through the rigidity after the second starting, and increases the energy dissipation capacity through the variable friction, thereby reducing the displacement angle and the acceleration between self-resetting prestressed concrete frame structure layers; meanwhile, the variable friction energy dissipater is reliably connected with the top and bottom positions of the side face of the beam through the embedded parts and the bolts and the beam column, floor arrangement is not influenced, and friction energy dissipation efficiency is maximized.
The invention combines the precast prestressed concrete beam-column node with the variable friction energy dissipater to resist the earthquake action and consume the earthquake energy. The structure comprises a precast concrete column, a precast concrete beam and a variable friction energy dissipater. The friction steel plate is not separated from the column in the node rotation process, and the shear-resistant stud is welded on the middle friction fixing plate. The inner friction steel plate and the middle friction steel plate generate relative sliding to dissipate seismic energy, and the prestressed tendons penetrating through the precast concrete columns and the precast concrete beams provide self-resetting force to enable the beams and the columns to be restored to the positions before deformation.
In the invention, the inner friction steel plate and the middle friction steel plate generate relative sliding energy dissipation, and the self-reset frame beam column node generates relative sliding and needs a certain rotating space, so that the diameter of the friction bolt hole of the middle friction steel plate is increased to ensure that the node is not limited in rotation. The middle friction steel plate and the outer friction steel plate are made into a camber, when the relative rotation of the beam column exceeds a certain range, the distance between the middle friction steel plate and the outer friction steel plate is continuously increased due to the camber, and the butterfly-shaped gasket is compressed, so that the normal positive pressure of the friction surface is continuously increased, the friction force is further increased, and the friction energy dissipater has secondary rigidity and gradually enhanced energy dissipation capacity.
The method comprises the steps of prefabricating concrete columns and concrete beams in factories, reserving prestressed tendon holes at corresponding positions, after beam and column members are hoisted in place on site, penetrating prestressed tendons through the reserved holes in the beam and the column, and then tensioning. The post-tensioned unbonded prestressed tendon can be used for device connection in the installation stage and can also bear the action of tensile force and bending moment in the use stage. In order to improve the energy consumption capability of the node device in the using process and greatly reduce the rigidity of the node after the node is opened, a pair of variable friction energy dissipaters are arranged at the upper part and the lower part of each beam column node. The variable energy dissipater comprises an energy dissipation device formed by combined steel pieces, and the energy dissipation device comprises an outer friction steel plate, a middle friction steel plate, an inner friction steel plate, friction plates, a column end embedded steel plate, a beam end embedded steel plate, pressure-bearing high-strength bolts, friction high-strength bolts and butterfly gaskets. Two middle friction steel plates provided with friction bolt holes and a relief surface in the variable friction energy dissipater are welded on a middle friction connecting plate to form a whole, and shear-resistant studs with enough quantity and strength are welded on a middle friction fixing plate welded on the middle friction connecting plate to connect the middle friction steel plates and the precast concrete column into a whole. The friction-variable energy dissipater is formed by connecting two inner friction steel plates connected by an end plate, an outer friction steel plate with a friction bolt hole and a relief surface arranged on the outermost side, a backing plate arranged in the partial area of the inner friction steel plate and the outer friction steel plate and connected with the upper end of a precast concrete beam into a whole through a pressure-bearing high-strength bolt, a friction plate is embedded between the inner friction steel plate and the middle friction steel plate, and the inner friction steel plate, the middle friction steel plate, the outer friction steel plate and the friction plate are connected into a whole through the friction high-strength bolt.
The device is mainly used for improving the energy consumption capability of the fabricated concrete frame structure under the earthquake action, effectively eliminating or reducing the residual deformation of the structure under the earthquake action and improving the assembly efficiency of the structure.
Aiming at the defects of the conventional self-resetting precast reinforced concrete frame joint connection method, the variable friction energy dissipation and the prestress resetting are closely fused, the variable friction energy dissipater is utilized to realize multi-stage starting and rigidity changing after starting, the high-order modal effect is controlled through the rigidity changing, and the energy dissipation capability is increased through the variable friction, so that the displacement angle and the acceleration between layers of the self-resetting prestress concrete frame structure are reduced. Meanwhile, the variable friction energy dissipater is reliably connected with the top and bottom positions of the side face of the beam through the embedded parts and the bolts and the beam column, floor arrangement is not influenced, and friction energy dissipation efficiency is maximized.
Has the advantages that: compared with the prior art, the invention has the following advantages:
at present, only a single starting force exists in self-resetting precast concrete frame joints based on yield energy dissipaters or friction energy dissipaters. Although the overall initial lateral stiffness of the structure is large, once the energy dissipater is subjected to yielding or friction starting, the beam-column joint gap is opened, the lateral stiffness of the structure is mainly provided by the stiffness of the prestressed tendons, and the structural stiffness is obviously reduced. Under the action of strong shock, the rigidity between layers is greatly weakened, the self-resetting precast concrete frame is easy to generate obvious high-order modal effect, the structural deformation is easy to concentrate, the displacement angle of a local floor is large, the damage of non-structural members is increased, and the post-shock resetting capability of the structure is also influenced. By adopting the self-resetting precast concrete beam column joint form of the technical scheme, under the action of an earthquake, the beam column is deformed relatively, and the relative sliding between the middle friction steel plate and the inner and outer friction steel plates is driven. The node is started for the first time and is located in the plane sliding section, and the pretightening force of the friction type high-strength bolt is constant at the moment, so that the friction force is unchanged. When the friction energy dissipater slides to the undulating surface section, the friction energy dissipater is started for the second time, the distance between the middle friction steel plate and the outer friction steel plate is continuously increased due to the existence of the undulating surface, the butterfly-shaped gasket is compressed, the normal positive pressure of the friction surface is continuously increased, the friction force is further increased, and the friction energy dissipater has secondary rigidity. In the design process, the secondary starting displacement of the energy dissipater, the rigidity after the secondary starting and the like can be effectively controlled by adjusting the length of the plane section and the angle of the bending plane section, so that the restorability of the structure under strong shock is improved.
Because the embedded steel plates of the beam column of the node are tightly attached together after the node is assembled, which is equivalent to that the node is pre-assigned with a rotating point, the beam column moves in a rigid body rotating around the rotating point in the earthquake process, and the deformation of the beam column is effectively reduced or even eliminated in the earthquake process. The connection form of the beam column end part and the variable friction energy dissipater and the embedded steel plate specially used for preventing local damage can effectively avoid local crushing (such as crushing of the end parts of the precast beam and the column) in the structural deformation process. Therefore, the main structural components such as the post-earthquake beam column and the like are basically kept in the elastic stage, so that the components are conveniently recycled and reassembled. All friction energy dissipaters are connected by bolts, so that the friction energy dissipaters are convenient to replace.
The prestressed tendons penetrating through the beam columns can provide a self-resetting force for the nodes to enable the deformation of the structure generated under the action of an earthquake to be restored to the original position, so that the nodes can obviously reduce or eliminate the residual deformation of the structure after the earthquake. And the self-resetting capability of the node can be controlled by changing the pre-applied force of the prestressed tendon, the section area of the prestressed tendon and the distance between the prestressed tendon and the section central axis according to the requirement.
Almost all components can be processed and finished on a non-construction site according to requirements and then transported to a construction site for assembly according to requirements, and the whole assembly process is dry operation. The processing of the components and the manufacturing of the connecting pieces can be completed in a factory, and compared with a common cast-in-place node and a common wet connection, the labor cost, the engineering progress and the engineering quality can be effectively controlled.
The node is based on the close fusion of the variable friction energy dissipation and the prestress reset, the variable friction energy dissipater realizes multi-stage starting and variable rigidity after starting, the high-order modal effect is controlled through the rigidity after starting, and the energy dissipation capacity is increased through the variable friction, so that the displacement angle and the acceleration between the self-resetting prestress concrete frame structure layers are reduced; meanwhile, the variable friction energy dissipater is reliably connected with the top and bottom positions of the side face of the beam through the embedded parts and the bolts and the beam column, floor arrangement is not influenced, and friction energy dissipation efficiency is maximized.
The rigidity of the node is mainly determined by the initial prestress, the pretightening force applied to the friction plate by the bolt and the force arm of the relative rotating point, and the initial prestress of the prestressed tendon and the pretightening force applied to the friction plate are easy to control, so that the rigidity of the node can be effectively controlled in design and construction according to engineering requirements. The friction energy dissipaters are arranged at the top and the bottom of the beam instead of the central shaft, the arrangement method of the friction energy dissipaters can increase the force arm of friction force, and the problem that the structural rigidity of the existing semi-rigid node form is insufficient is remarkably solved.
Drawings
FIG. 1 is a schematic view of the construction of the apparatus of the present invention;
FIG. 2 is a cross-section 1-1 of FIG. 1;
FIG. 3 is a nodal rotation mechanism;
FIG. 4 is a variable friction energy consumption mechanism of a beam-column interface opening node;
FIG. 5(a) is a front view of a precast concrete column and an opening, and FIG. 5(b) is a side view of the precast concrete column and the opening;
FIG. 6 is a schematic view of a precast concrete beam and an opening;
FIG. 7 is a schematic view of the inner friction steel plate being perforated and connected;
FIG. 8 is a schematic view of the opening and connection of the middle friction steel plate;
FIG. 9 is a schematic view of an outer friction steel plate and openings;
FIG. 10 is a schematic view of a friction plate and an opening;
FIG. 11 is a schematic view of the pad and the opening;
fig. 12 is a schematic diagram of a framework employing the node apparatus of the present invention.
The figure shows that: prefabricating a concrete column 1; prefabricating a concrete beam 2; a middle friction steel plate 3; a middle friction connecting plate 4; a middle friction fixing plate 5; an inner friction steel plate 6; an inner friction end plate 7; an outer friction steel plate 8; a friction plate 9; a friction type high-strength bolt 10; a pressure-bearing high-strength bolt 11; a tendon 12; a prestressed tendon anchorage 13; shear studs 14; a first friction bolt hole 15; a second friction bolt hole 16; a third friction bolt hole 17; a fourth friction bolt hole 18; a backing plate 19; butterfly spacers 20; a first fixing bolt hole 21; a second fixing bolt hole 22; and a third fixing bolt hole 23.
Detailed Description
The technical solution of the present invention will be described in detail below with reference to the accompanying drawings.
As shown in fig. 1, in the top-bottom variable friction energy dissipation self-resetting prestressed concrete beam-column joint device, the main body components comprise a precast concrete column 1 and a precast concrete beam 2, and the connecting components comprise upper and lower variable friction energy dissipaters of the joint. Under the action of an earthquake, the prestressed tendons 12 in the self-resetting precast concrete beam-column joints can provide self-resetting force to eliminate residual deformation of the joints, the variable friction energy dissipater arranged at the beam-column joints can consume a large amount of earthquake energy, multi-stage starting and rigidity changing after starting are achieved, high-order modal effect is controlled through the rigidity after starting, and energy dissipation capacity is increased through variable friction, so that displacement angle and acceleration between self-resetting prestressed concrete frame structure layers are reduced, obvious plastic deformation of main structural members such as precast beams and columns is avoided, and earthquake force is jointly borne by the precast concrete beams, the prestressed tendons and the friction energy dissipater. The following configurations of the respective portions are described in detail:
(1) as shown in fig. 1, the self-resetting precast concrete frame comprises a precast concrete column 1 and a precast concrete beam 2 which are used as main body parts of a node, and after connecting members such as a variable friction energy dissipater and a prestressed tendon are assembled into a whole, the energy dissipation capacity and the restorability of the structure can be effectively improved, and the seismic design of the structure under different seismic capacity requirements is facilitated.
(2) Two inner friction steel plates 6 with second friction bolt holes 16 in the friction-variable energy dissipater are welded on an inner friction end plate 7 to form a whole, and fixing bolt holes are respectively formed in the inner friction steel plates 6, the outer friction steel plates 8 and a backing plate 19 clamped between the inner friction steel plates 6 and the outer friction steel plates 8 and in a partial area between the inner friction steel plates and the outer friction steel plates for penetrating through pressure-bearing type high-strength bolts 11 to connect the inner friction steel plates 6, the outer friction steel plates 8, the backing plate 19 and the precast concrete beam 2 into a whole (figure 2). Two middle friction steel plates 3 with friction bolt holes and a relief surface are connected into a whole through a middle friction connecting plate 4, shear-resistant studs are welded on a middle friction fixing plate 5 connected with the middle friction connecting plate 4 to enable the middle friction fixing plate to be pre-embedded in the precast concrete column 1 so as not to be separated, a friction plate 9 is embedded between an inner friction steel plate 6 and the middle friction steel plate 3, and the inner friction steel plate 6, the middle friction steel plate 3, an outer friction steel plate 8 and the friction plate 9 are connected into a whole through friction type high-strength bolts 10 to form the variable friction energy dissipater.
(4) The unbonded prestressed tendons 12 which are horizontally and symmetrically arranged generate pressure on the frame beam and bear bending moment, and the shearing force at the beam end is mainly born by higher friction force generated by the prepressing of the beam column contact surface on the unbonded prestressed tendons 12 and the friction force between the friction steel plate and the internal friction steel plate in the friction energy dissipater. Under the action of earthquake, the beam column is relatively deformed (figure 3), and the relative sliding between the middle friction steel plate and the inner and outer friction steel plates is driven (figure 4). The node is started for the first time and is located in the plane sliding section, and the pretightening force of the friction type high-strength bolt is constant at the moment, so that the friction force is unchanged. When the friction energy dissipater slides to the undulating surface section, the friction energy dissipater is started for the second time, the distance between the middle friction steel plate and the outer friction steel plate is continuously increased due to the existence of the undulating surface, the butterfly-shaped gasket is compressed, the normal positive pressure of the friction surface is continuously increased, and the friction force is further increased, so that the friction energy dissipater has secondary rigidity (figure 4). In the design process, the secondary starting displacement of the energy dissipater, the rigidity after the secondary starting and the like can be effectively controlled by adjusting the length of the plane section and the angle of the bending plane section, so that the restorability of the structure under strong shock is improved. Thereby avoiding the damage of the main body components such as the precast concrete column 1 with the hidden bracket, the precast concrete beam 2 and the like. After the earthquake, the structure is restored to the original position (self-reset) under the action of prestress.

Claims (6)

1. The top-bottom variable friction energy consumption self-resetting prestressed concrete beam column joint device is characterized by comprising a precast concrete column (1), a precast concrete beam (2) positioned on one side of the precast concrete column (1), an upper variable friction energy consumption device and a lower variable friction energy consumption device, wherein the upper variable friction energy consumption device and the lower variable friction energy consumption device are used for connecting the precast concrete column (1) and the precast concrete beam (2) into a whole, each variable friction energy consumption device comprises two middle friction fixing plates (5) connected to the side surface of the precast concrete column (1), a middle friction connecting plate (4) used for connecting the two middle friction fixing plates (5) into a whole, two middle friction steel plates (3) connected to the middle friction connecting plate (4) and provided with friction bolt holes, two inner friction steel plates (6) connected to the precast concrete beam (2) and provided with friction bolt holes, and two outer friction steel plates (8) provided with friction bolt holes, The two inner friction steel plates (6) are connected into an integral inner friction end plate (7), the two inner friction steel plates (6) are symmetrically arranged at two sides of the top of the precast concrete beam (2), the two outer friction steel plates (8) are respectively arranged at the outer sides of the inner friction steel plates (6), a backing plate (19) is arranged in a partial area between the inner friction steel plates (6) and the outer friction steel plates (8), the inner friction steel plates (6), the outer friction steel plates (8), the backing plate (19) and the precast concrete beam (2) are connected into a whole through pressure-bearing type high-strength bolts (11), the middle friction steel plate (3) is arranged in the rest area between the outer friction steel plates (8) and the inner friction steel plates (6), and the outer friction steel plates (8), the middle friction steel plates (3), the inner friction steel plates (6) and the precast concrete beam (2) are connected into a whole through friction type high-strength bolts (, butterfly gaskets (20) positioned on the outer sides of the outer friction steel plates (8) are mounted on the friction type high-strength bolts (10), the inner friction end plates (7) are adjacent to the middle friction connecting plates (4), the opposite side faces of the outer friction steel plates (8) and the middle friction steel plates (3) are arranged to be undulating surfaces, and the undulating surfaces of the outer friction steel plates and the middle friction steel plates are mutually staggered and embedded;
and transverse prestressed tendons (12) penetrating through the precast concrete column (1) and the precast concrete beam (2) are arranged in the precast concrete column.
2. The top-bottom friction-variable energy dissipation self-resetting prestressed concrete beam-column joint device according to claim 1, wherein a friction plate (9) is embedded between the middle friction steel plate (3) and the inner friction steel plate (6) in the friction-variable energy dissipation device.
3. The top-bottom variable friction energy consumption self-resetting prestressed concrete beam-column joint device according to claim 1, wherein the first friction bolt hole (15) reserved on the precast concrete beam (2), the second friction bolt hole (16) on the inner friction steel plate (6) and the fourth friction bolt hole (18) on the outer friction steel plate (8) have the same aperture, and are smaller than the aperture of the third friction bolt hole (17) on the middle friction steel plate (3).
4. The top-bottom friction-variable energy-consumption self-resetting prestressed concrete beam-column joint device according to claim 3, characterized in that the pressure-bearing high-strength bolt (11) passes through a first fixing bolt hole (21) formed in the outer friction steel plate (8), a second fixing bolt hole (22) formed in the backing plate (19) and a third fixing bolt hole (23) formed in the inner friction steel plate (8) and then is fixedly connected with the precast concrete beam (2), and the friction-bearing high-strength bolt (10) passes through a fourth friction bolt hole (18), a third friction bolt hole (17) and a second friction bolt hole (16) and then is fixedly connected with the precast concrete beam (2).
5. The top-bottom variable friction energy dissipation self-restoring prestressed concrete beam-column joint device according to claim 1, 2, 3 or 4, characterized in that the middle friction fixing plate (5) is fixed on the side surface of the precast concrete column (1) through shear resistant studs (14).
6. The top-bottom variable friction energy dissipation self-restoring prestressed concrete beam-column joint device according to claim 1, 2, 3 or 4, characterized in that the prestressed tendons (12) are arranged in reserved transverse tendon-passing holes on the precast concrete column (1) and the precast concrete beam (2).
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CN112962807B (en) * 2021-01-21 2022-02-22 北京交通大学 Friction type self-resetting cast-in-situ beam column node
CN113175417A (en) * 2021-04-15 2021-07-27 重庆大学 Wind turbine generator system lattice type tower capable of recovering energy consumption and enhancing energy consumption capacity
CN113833144A (en) * 2021-09-29 2021-12-24 东南大学 Friction energy consumption rotation self-reset node device

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