An energy dissipation and shock absorption node used in assembled concrete frame structure

Abstract

The invention discloses an energy dissipation and shock absorption node applied to an assembled concrete frame structure, belonging to the field of building structure technology and structural shock absorption. The node is a hinged node, composed of a connecting steel plate, a pin shaft and a pad. The connecting steel plate can rotate with the pin shaft as the center of a circle to increase the deformation capacity of the node. Polytetrafluoroethylene is arranged between the pad and the steel plate to prevent the node from being damaged by friction. Energy dissipation and shock absorption devices are installed above and below the pin shaft. Metal rubber is the main shock absorption component. The metal rubber is placed in a bushing. An extrusion plate is arranged on the beam. The metal rubber can be squeezed by the extrusion plate and the friction between the metal rubber and the bushing can be used to consume part of the energy generated by the earthquake. The invention has a simple structure, and all parts and accessories can be prefabricated in a factory, which is easy to replace, economical and reasonable, has a good shock absorption protection effect, a high safety factor, good structural durability, and can be used for a long time.

Description

Technical Field

[0001] The invention relates to the technical field of building structures and the field of structural shock absorption, and in particular to an energy dissipation and shock absorption node applied to an assembled concrete frame structure. Background Art

[0002] Earthquakes are extremely destructive disasters. Strong earthquakes occurring on the seabed or in coastal areas can cause tsunamis. Strong earthquakes occurring on the continental area can cause secondary disasters such as landslides, collapses, and ground fissures, which seriously endanger human life. Therefore, it is particularly important to improve the earthquake resistance of buildings.

[0003] Prefabricated structure is one of the important directions of the development of building structure in my country. It has the advantages of short construction period, low construction intensity, high degree of mechanization and good thermal insulation performance. Therefore, prefabricated structure is increasingly favored by engineers at home and abroad. In the frame structure, the beam-column node is responsible for distributing internal forces to ensure the integrity of the structure, and it is easy to become a weak point under the action of earthquakes and is easy to be damaged. In view of the increasingly high requirements for the seismic resistance of buildings, prefabricated nodes have always been a difficult problem to be solved. At present, prefabricated beam-column nodes are mostly connected by grouting tubes, prestressed reinforcing bars, and steel connections. The construction process is complicated and the cost is high. The connection form of such nodes is mostly rigid connection, with complex force and small deformation capacity, and it is easy to crack under strong earthquakes. Since whether the frame can maintain its integrity depends on the deformation capacity of the beam-column node after large deformation, the hinged node is a good choice. The hinged node does not transmit bending moment, the force is simple, and the beam can rotate freely, which increases the deformation capacity of the node. On this basis, adding energy dissipation devices between beams and columns can improve the energy dissipation capacity of hinged nodes. The enhancement of the node's energy consumption capacity means the improvement of the node's seismic resistance, which means that the node can meet the seismic requirements of "not being damaged by small earthquakes, being repairable by medium earthquakes, and not collapsing by large earthquakes." Summary of the invention

[0004] In order to solve the above technical problems, the present invention proposes an energy dissipation and shock absorption node applied to a prefabricated concrete frame structure. The node is a hinged node, which greatly increases the deformation capacity of the node; in addition, two energy dissipation devices are added between the beams and columns, which has a simple structure, high energy dissipation efficiency, and low energy loss, and can effectively improve the safety and durability of the structure.

[0005] Two connecting steel plates A are embedded in the column, and pin holes A are set on them. Two connecting steel plates B are embedded at both ends of the beam, and pin holes B are set on them. When assembling, the connecting steel plates A and B are aligned and the pins are passed through the pin holes A and B to form a hinge. In order to fix the position of the beam and column and ensure that the two do not slide relative to each other when the hinge node rotates, the gap between the connecting steel plates A and B is filled with a circular steel plate as a pad. The energy dissipation and shock absorption device is arranged above and below the hinge pin shaft. The device is composed of an upper bushing, a lower bushing, an upper metal rubber, a lower metal rubber, an upper extrusion plate, a lower extrusion plate, an upper support plate and a lower support plate. One end of the upper bushing and the lower bushing is connected to the column through an embedded part, and the other end is opened to form a hollow cuboid. The upper metal rubber and the lower metal rubber are fixed in the hollow cuboid respectively. The upper extrusion plate and the lower extrusion plate are arranged at the end of the beam. There are two upper support plates behind the upper extrusion plate, and there are two lower support plates behind the lower extrusion plate. In the static state, the upper extrusion plate and the lower extrusion plate are in contact with the upper metal rubber and the lower metal rubber respectively, but there is no fixed connection between them.

[0006] The column is a prefabricated column, with a dowel at one end and a hole at the other end. The dowel of the upper column is inserted into the hole of the lower column. The hole is grouted to make the dowel and the lower column form a whole, and a 200mm high space is reserved in the middle. Compared with cast-in-place columns, prefabricated columns are prefabricated in the factory and can be directly installed on site, which is convenient for construction and can shorten the construction period. The reserved 200mm space is to facilitate the installation of subsequent components.

[0007] The connecting steel plate A is fixed in the above-reserved space of 200 mm height and then poured with cast-in-place concrete.

[0008] The beam is a prefabricated beam, and the connecting steel plate B is embedded in both ends of the beam.

[0009] During assembly, the connecting steel plates A and B are aligned. They are arranged in a staggered manner, and there is a gap between the two connecting steel plates. The thickness of the pad is such that it fills the gap between the adjacent connecting steel plates A or B, and polytetrafluoroethylene is provided between the pad and the connecting steel plates A and B. The pad serves to isolate the adjacent connecting steel plates, preventing the connecting steel plates from squeezing and rubbing against each other, which results in a decrease in the rotation ability of the node. Polytetrafluoroethylene can reduce the friction between the pad and the connecting steel plates, preventing friction damage to the node during rotation.

[0010] The upper metal rubber and the lower metal rubber are a kind of material pressed by metal wire, which are fixed in the upper bushing and the lower bushing respectively by bolts. The upper bushing and the lower bushing are both hollow cuboids. The upper metal rubber and the lower metal rubber are filled in the corresponding hollow cuboids respectively, and extend out of the upper bushing and the lower bushing respectively by 2 cm or more. Metal rubber has both the inherent characteristics of metal and the elasticity similar to rubber. It has strong high and low temperature resistance. It can also be corrosion-resistant by selecting different metals, and there is no possibility of aging. It is an ideal substitute for traditional rubber. When the metal rubber is subjected to vibration excitation or impact, the metal wire inside it will undergo elastic deformation. When the deformation reaches the critical value, the metal wires begin to contact each other, and then friction, extrusion and a large amount of energy dissipation will occur. When the earthquake force comes and causes the node to rotate, the metal rubber will be squeezed by the extrusion plate and compressed and deformed, converting part of the energy generated by the earthquake into the elastic potential energy of the rubber. The bushing can prevent the metal rubber from expanding outward. At the same time, the metal rubber and the inner wall of the bushing rub against each other, which can convert part of the energy generated by the earthquake into heat energy generated by friction, thereby achieving the purpose of energy dissipation and shock reduction. The metal rubber is fixed in the bushing by bolts, which prevents the metal rubber from falling off from the bushing.

[0011] The upper extrusion plate and the lower extrusion plate are in contact with the upper metal rubber and the lower metal rubber respectively, but no connector is provided on the contact surface. The function of the extrusion plate is to extrude the metal rubber to deform it, thereby converting part of the energy generated by the earthquake into elastic potential energy generated by deformation and heat energy generated by friction, so as to dissipate energy and reduce shock. Two support plates are arranged behind the extrusion plate to prevent the extrusion plate from breaking under the action of external force.

[0012] The working process 1 of the energy dissipation and shock absorption node is as follows:

[0013] When the earthquake force causes the connecting steel plate B6 in the node to rotate upward with the pin shaft 5 as the center, the beam 2 also rotates upward, driving the upper extrusion plate 14 to rotate leftward, extruding the upper metal rubber 12. The deformation of the upper metal rubber 12 can consume part of the energy generated by the earthquake. At this time, the lower extrusion plate 15 is disengaged from the lower metal rubber 13, and the lower metal rubber 13 does not deform.

[0014] The working process 2 of the energy dissipation and shock absorption node is as follows:

[0015] When the earthquake force causes the connecting steel plate B6 in the node to rotate downward with the pin shaft 5 as the center, the beam 2 also rotates downward, driving the lower extrusion plate 15 to move leftward, extruding the lower metal rubber 13. The deformation of the lower metal rubber 13 can consume part of the energy generated by the earthquake. At this time, the upper extrusion plate 14 is disengaged from the upper metal rubber 12, and the upper metal rubber 12 does not deform.

[0016] The present invention has the following advantages: (1) This node does not transmit bending moment and the force is simple; (2) When the earthquake force acts on the frame structure, the beam can rotate freely, thereby improving the deformation capacity of the node; (3) Polytetrafluoroethylene is arranged between the steel plate and the pad to reduce friction resistance; (4) A shock-absorbing device is arranged between the beam and the column to increase the energy consumption capacity of the node.

[0017] In addition, the node has a simple structure, and all parts and accessories can be prefabricated in the factory, which is easy to replace and economical. The use of this energy dissipation and shock absorption node can ensure better shock absorption protection effect, higher safety factor, high structural durability, and long-term use. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the technical description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0019] Figure 1 : Schematic diagram of the overall structure of the energy dissipation and shock absorption node of the assembled concrete frame structure;

[0020] Figure 2 : Top view of hinged node;

[0021] Figure 3 : Schematic diagram of the connection between bushing and metal rubber;

[0022] Figure 4 : Schematic diagram of pad;

[0023] Figure 5 : Schematic diagram of connection between beam column and connecting steel plate;

[0024] Figure 6 : Isometric diagram of the extrusion plate and the support plate;

[0025] Figure 7 : Schematic diagram of working process 1;

[0026] Figure 8 : Schematic diagram of working process 2;

[0027] Fig. 9 : Diagram of the wall sealing of the energy dissipation and shock absorption device.

[0028] exist Figures 1 to 9Among them, 1 is a column; 2 is a beam; 3 is a connecting steel plate A; 4 is a pin hole A; 5 is a pin; 6 is a connecting steel plate B; 7 is a pin hole B; 8 is a pad; 9 is polytetrafluoroethylene; 10 is an upper bushing; 11 is a lower bushing; 12 is an upper metal rubber; 13 is a lower metal rubber; 14 is an upper extruded plate; 15 is a lower extruded plate; 16 is an upper support plate; 17 is a lower support plate, and 18 is cast-in-place concrete. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments.

[0030] Figure 1 1 is a schematic diagram of an overall energy dissipation and shock absorption node applied to a prefabricated concrete frame structure according to the present invention. Figure 1 The energy dissipation and shock absorption node mainly includes a connecting steel plate A3, a connecting steel plate B6, a pin 5, an upper bushing 10, a lower bushing 11, an upper metal rubber 12, a lower metal rubber 13, an upper extrusion plate 14, a lower extrusion plate 15, etc., wherein the connecting steel plate B6 can rotate along the pin 5, increasing the deformation capacity of the node, and the metal rubber can convert part of the energy generated by the earthquake into heat energy generated by friction and elastic potential energy of the rubber, thereby achieving the purpose of energy dissipation and shock absorption. The present invention provides an energy dissipation and shock absorption node applied to an assembled concrete frame structure, characterized in that the specific implementation steps are as follows:

[0031] (1) The column 1 is divided into two parts and prefabricated in the factory, one part is inserted with dowel bars, and the other part is reserved with holes. At the same time, the beam is also prefabricated and two holes are reserved;

[0032] (2) Insert the dowel bars into the holes, leaving 200 mm between the two columns for pouring concrete, and insert the two prefabricated connecting steel plates A3 into the cast-in-place concrete 18;

[0033] (3) Insert the prefabricated connecting steel plate B6 into the two holes reserved on the beam and fix it with concrete;

[0034] (4) Paste polytetrafluoroethylene 9 on both sides of the pad 8;

[0035] (5) Align the holes on the connecting steel plate A3 and the connecting steel plate B6, place the pad 8 between the two adjacent steel plates, and fix the connecting steel plate A3, the connecting steel plate B6 and the pad 8 with the pin 5;

[0036] (6) The upper bushing 10 and the lower bushing 11 are prefabricated in the factory, the upper metal rubber 12 and the lower metal rubber 13 are respectively fixed inside the upper bushing 10 and the lower bushing 11 with bolts, and the upper bushing 10 and the lower bushing 11 are connected to the column through embedded parts;

[0037] (7) The upper extrusion plate 14 and the lower extrusion plate 15 prefabricated in the factory are installed on the beam 2 through embedded parts, and ensure that the upper extrusion plate 14 and the lower extrusion plate 15 are in contact with the upper metal rubber 12 and the lower metal rubber 13 respectively.

[0038] (8) The upper support plate 16 and the lower support plate 17 are prefabricated in the factory and fixed to the beam 2 through embedded parts. The upper support plate 16 is welded to the upper extrusion plate 14, and the lower support plate 17 is welded to the lower extrusion plate 15.

[0039] It will be easily understood by those skilled in the art that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An energy dissipation and shock absorption node applied to a prefabricated concrete frame structure, characterized in that: Two connecting steel plates A (3) are embedded in the column (1) and provided with a pin hole A (4). Two connecting steel plates B (6) are embedded at both ends of the beam (2) and provided with a pin hole B (7). When assembling, the connecting steel plates A (3) and B (6) are aligned and then a pin (5) is passed through the pin hole A (4) and the pin hole B (7) to form a hinge. The gap between the connecting steel plates A (3) and B (6) is filled with a pad (8) made of a circular steel plate. Polytetrafluoroethylene (9) is arranged between the pad (8) and the connecting steel plates A (3) and B (6) respectively. An energy dissipation and shock absorbing device is arranged above and below the pin (5). The device is composed of an upper bushing (10), a lower bushing (11), an upper metal rubber (12), and a lower metal rubber (13). , an upper extrusion plate (14), a lower extrusion plate (15), an upper support plate (16) and a lower support plate (17), wherein one end of the upper bushing (10) and the lower bushing (11) are connected to the column (1) through an embedded part, and the other end is open to form a hollow cuboid, and an upper metal rubber (12) and a lower metal rubber (13) are fixed inside the upper bushing (10) and the lower bushing (11), respectively, and the upper extrusion plate (14) and the lower extrusion plate (15) are arranged at the end of the beam (2), and the upper extrusion plate (14) is supported by two upper support plates (16) at the back, and the lower extrusion plate (15) is supported by two lower support plates (17) at the back, and the upper extrusion plate (14) and the lower extrusion plate (15) are respectively in contact with the upper metal rubber (12) and the lower metal rubber (13), but no connecting parts are arranged on the contact surface.

2. The energy dissipation and shock absorption node used in a prefabricated concrete frame structure according to claim 1, characterized in that: The column (1) is a prefabricated column, with a dowel bar at one end and a hole at the other end. The dowel bar of the upper column is inserted into the hole of the lower column, and the hole is grouted so that the dowel bar and the lower column form a whole, with a space of 200 mm in height reserved in the middle.

3. The energy dissipation and shock absorption node used in a prefabricated concrete frame structure according to claim 2, characterized in that: The connecting steel plate A (3) is fixed in the above-reserved space with a height of 200 mm, and then cast-in-place concrete (18) is poured.

4. The energy dissipation and shock absorption node for a prefabricated concrete frame structure according to claim 1, characterized in that: The beam (2) is a prefabricated beam, and the connecting steel plates B (6) are pre-buried at both ends of the beam.

5. The energy dissipation and shock absorption node used in a prefabricated concrete frame structure according to claim 1, characterized in that: The upper metal rubber (12) and the lower metal rubber (13) are a material pressed from metal wire and are fixed in the upper bushing (10) and the lower bushing (11) respectively by bolts. The upper bushing (10) and the lower bushing (11) are both hollow rectangular parallelepiped shapes. The upper metal rubber (12) and the lower metal rubber (13) are respectively filled in the corresponding hollow rectangular parallelepiped and extend out of the upper bushing (10) and the lower bushing (11) by 2 cm or more.

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