CN109024880A - Self-resetting can assemble multistage joist steel frame joint after shake - Google Patents

Abstract

The invention discloses a post-earthquake self-resettable multi-segment beam steel frame node. The I-shaped steel beam is connected with different forms of special-shaped columns through web angle steel and flange angle steel to form a connection form with no welds and full bolts; the middle part The I-beam and the end I-beam are connected through the web connecting plate and the high-strength silicone rubber plate to form a non-welded full-bolt connection form with good ductility and strong energy dissipation performance; Prestressed steel cables are applied to the joints of the I-beams at the ends to form prestressed self-resetting nodes after earthquakes.

Description

Self-resetting post-earthquake assembling multi-segment beam steel frame joints

technical field

The invention relates to a post-earthquake self-resettable multi-segment beam steel frame node, which belongs to the technical field of earthquake prevention and disaster reduction.

Background technique

Multiple earthquakes have proved that the seismic performance of steel structure buildings is greatly improved compared with reinforced concrete buildings, and the difficulty of post-earthquake repairs is greatly reduced. Therefore, vigorously developing steel structure buildings is the only way to improve the quality of residents' housing, especially the structural forms with high technological content should be paid more attention to and developed.

Steel structure prestressing technology has developed rapidly, the most representative of which is the gymnasium of Beijing University of Technology. Innovative research on structural system innovation. However, in the frame structure system, especially the application of prestressing technology at local joints is rarely studied, and the depth is far from enough.

High-strength tear-resistant silicone rubber is a special synthetic rubber with excellent temperature adaptability, chemical stability, fire resistance, and non-toxic characteristics, especially its tear resistance and tensile strength compared with traditional natural rubber. It has been greatly improved, and the tensile strength can reach 2000N/CM ² . It is widely used in the fields of national defense industry, aviation, space navigation, electrical appliances, medical equipment, etc., but it is still blank in the application of building structures, but it has high strength, The high expansion rate and its fire-proof and non-toxic properties meet the requirements of building structures for civil engineering materials, and we should actively explore ways to use them to give full play to their excellent performance.

Contents of the invention

The invention provides a post-earthquake self-resettable multi-segment beam steel frame node belonging to the technical field of earthquake prevention and disaster reduction. Its purpose is to improve the ductility performance of the frame structure and then improve the seismic performance of the structure, reduce the difficulty of post-earthquake repair and maintenance costs, shorten the construction period, and reduce labor costs. The post-earthquake self-resetting assembleable multi-segment beam steel frame joints basically consist of frame columns, joint beams, intermediate beams, prestressed cables, beam-column joint connectors, and beam-beam connectors. Construction sequence: first install the beam-column joints, and then install the beam-beam joints. The specific structure is that during the construction process, first install the top and bottom angle steel at the beam-column joint, and then install the I-shaped web angle steel at the beam-column joint. After the beam-column joint is installed, install the beam-beam joint: first install the beam-beam joint Web connection plate, then install the top and bottom high-strength tear-resistant silicone rubber plate and sealing plate, and finally install and stretch the high-strength prestressed cable, and the beam-beam contact surface will generate precompressed stress under the action of the tension of the prestressed cable , this kind of precompressive stress will provide a larger resisting moment for the beam-beam joint, which greatly improves the connection strength, and the web connection plate at the beam-beam joint effectively increases the web thickness, providing a larger bending moment for the beam-beam joint Resists shear forces.

The basic principle of post-earthquake self-resetting and assembling multi-segment beam steel frame joints: when the earthquake action reaches the moderate earthquake level, the contact surface of the beam and beam will open first, and the high-strength silicone rubber will deform greatly and consume seismic energy, thus avoiding the impact of beams and columns, etc. Damage to main components. After the earthquake, the structure returns to the pre-earthquake position under the action of the pretension force of the prestressed cable and the contraction force of the high-strength silicone rubber. Studies have shown that the combination of high-strength silicone rubber and prestressed cables at the beam-beam joint can reach the strength of welding under normal working conditions, and the deflection generated during use is less than the maximum deflection specified in the code; under earthquake action, the high-strength Silicone rubber and prestressed cables can exert their excellent expansion and contraction properties, absorb earthquake energy, and then protect the beam-column joints, which conforms to the design concepts of "strong nodes, weak components" and "strong columns and weak beams".

The application of prestressed cables and high-strength silicone rubber enables the steel frame structure to obtain better seismic performance and higher safety factor. The main advantages of post-earthquake self-resetting and assembling multi-segment beam steel frame joints: (1) The organic combination of new technology and new materials makes the steel frame have better seismic performance, and the application of prestressing technology greatly reduces the difficulty of post-earthquake repair. When the displacement angle is small, the present invention can utilize the elastic shrinkage ability of the prestressed cable and high-strength silicone rubber to realize self-resetting without repairing; (3) It is mainly connected by high-strength bolts. There is no welding work on the construction site, and there is no wet operation of traditional concrete structures. The process is simple and green. Poor quality of welds caused by low welding materials, poor workmanship and other reasons lead to structural quality and safety accidents; (4) The full bolt connection can realize factory manufacturing and assembly construction of building structures, greatly reducing the construction period costs and labor costs.

The technical solution adopted in the present invention is self-resetting after earthquake and multi-segment beam steel frame joints. According to the different positions of the joints, the joint forms include three specifications, which are L-shaped joint connection, T-shaped joint connection and cross-shaped joint connection.

The cross-shaped node connection is the connection between the cross-shaped column 3 and the end I-beam 4 . Specific connection steps: the hoisting equipment makes the end I-beam 4 and the cross-shaped column 3 vertically and closely contacted, and the web angle steel 5 is used as a connecting piece to connect the end I-beam 4 and the cross-shaped column 3 with high-strength bolts. The installation process It is necessary to ensure that the end I-beam 4 is perpendicular to the cross-shaped column 3, and then install the flange angle steel 6 with high-strength bolts to increase the rotational stiffness at the beam-column node to achieve consolidation.

The connection steps of the middle I-beam 7 and the end I-beam 4: the hoisting equipment will contact the middle I-beam 7 and the end I-beam 4 on the same horizontal plane, and the web connecting plate 8 is used as the connecting piece of the two sections of beams Connect the middle I-beam 7 and the end I-beam 4 together with high-strength bolts, and then install the high-strength silicone rubber plate 9 and the sealing plate 10 with high-strength bolts;

The L-shaped node connection form and the T-shaped node connection form are the same as the cross-shaped node connection form. Only the cross-shaped column 3 adopts L-shaped column 1 and T-shaped column 2 respectively; the L-shaped joint connection is the frame corner frame column, that is, the L-shaped column 1 is connected to the end I-beam 4; the T-shaped joint connection is the frame side frame column That is, the T-shaped column 2 is connected with the I-beam 4 at the end;

Arrangement of node prestress: connect nodes of different forms according to the above method; pass the prestress cable 11 through the holes reserved on the I-beam reinforcement 12 in sequence, apply the calculated prestress value, and anchor with permanent anchors On the I-beam reinforcement 12.

The beneficial effect of the present invention is that, in the post-earthquake self-resetting and assembling multi-segment beam steel frame joints, the beams used are all I-shaped steel beams, which are easy to obtain materials, and the abdominal space of the I-shaped beams is relatively large, which is convenient for pipelines to pass through , effectively increasing the headroom of the room.

The post-earthquake self-resetting can be assembled with multi-section beam-steel frame nodes, and the energy dissipation position is located at the beam-beam joint, and this place is elastically designed, which not only meets the design requirements of "strong nodes, weak components", but also ensures the safety of structural components , to resist high-intensity earthquakes with a flexible design; there is no welding in the installation process, and all mechanically installed high-strength bolts are used to effectively ensure the construction quality and reduce environmental pollution; because the invention adopts a full-bolt connection method, when the building is demolished, Bolts can be loosened and components can be dismantled one by one. The steel is efficiently recycled and the generation of construction waste is reduced, which truly realizes the concept of green environmental protection. Therefore, the present invention is a steel structure with good seismic performance, green environmental protection and sustainable development. node.

The post-earthquake self-resetting can be assembled with multi-segment beam-steel frame joints, and the prestressing technology is applied to the beam-beam connection, which realizes the self-resetting of post-earthquake structural members, greatly reduces post-earthquake repair costs; improves the seismic performance of beam-column joints Performance, thereby improving the seismic performance of the frame structure system.

The post-earthquake self-resetting and assembling multi-segment beam steel frame joints solves the current situation of weak joints in traditional steel structures, and gives full play to the advantages of good ductility of steel structures. Compared with the traditional steel structure building nodes, it has many advantages such as good seismic performance, less environmental pollution, fewer safety accidents and less difficulty in repairing.

Description of drawings

The present invention will be further described below in conjunction with accompanying drawings and examples.

Fig. 1 is the schematic diagram of L-shaped column, T-shaped column and cross-shaped column of the present invention

Fig. 2 is the split schematic diagram of the beam-column node of the present invention

Fig. 3 is a schematic diagram of beam-beam connection disassembly of the present invention

Fig. 4 is a schematic diagram of the overall split of the framework node of the present invention

Fig. 5 is the L-shaped node schematic diagram of the present invention

Fig. 6 is a T-shaped node schematic diagram of the present invention

Fig. 7 is a cross-shaped node schematic diagram of the present invention

In the figure 1. L-shaped column, 2. T-shaped column, 3. Cross-shaped column, 4. End I-beam, 5. Web angle steel, 6. Flange angle steel, 7. Middle I-beam, 8. Web Plate connecting plate, 9. High-strength silicone rubber plate, 10. Sealing plate, 11. Prestressed cable, 12. I-beam reinforcement

Detailed ways

The present invention is described in detail below in conjunction with accompanying drawing:

As shown in accompanying drawing 1, in the post-earthquake self-resettable multi-segment beam steel frame node of the present invention, the involved special-shaped columns are: L-shaped column 1, T-shaped column 2, and cross-shaped column 3;

As shown in accompanying drawing 2, among the post-earthquake self-resettable multi-section beam steel frame nodes of the present invention, mainly include L-shaped, T-shaped, and cross-shaped nodes, and the cross-shaped nodes are taken as an example to split in the figure, The cross-shaped node connection is the connection between the frame column 3 in the middle of the frame and the I-beam 4 at the end. Specific connection steps: The hoisting equipment connects the I-beam 4 at the end and the frame column 3 vertically and closely, and the web angle steel 5 is used as a connecting piece to connect the I-beam 4 at the end with the frame column 3 with high-strength bolts. Ensure that the I-beam 4 at the end is perpendicular to the frame column 3, and then install the flange angle steel 6 with high-strength bolts to increase the rotational stiffness at the beam-column node to achieve the effect of consolidation;

As shown in accompanying drawing 3, in the post-earthquake self-resettable multi-section beam steel frame node of the present invention, the connection steps of the middle I-beam 7 and the end I-beam 4: hoisting equipment connects the middle I-beam 7 to the end The upper I-beam 4 is in contact with and on the same level, and the web connecting plate 8 is used as a connecting piece of the two beams to connect the middle I-beam 7 and the end I-beam 4 with high-strength bolts, and then install the high-strength beam with high-strength bolts. Silicone rubber plate 9 and sealing plate 10;

As shown in accompanying drawing 4, in the post-earthquake self-resettable multi-section beam steel frame node of the present invention, the node connection is divided into two parts, one is the beam-column connection, and the other part is the middle I-beam 7 and the end I-beam 4 connections;

As shown in accompanying drawings 5-7, in the post-earthquake self-resetting assembleable multi-segment beam steel frame joints of the present invention, there are three types of joints, which are L-shaped, T-shaped, and cross-shaped.

Claims (3)

1. Self-resetting after the earthquake can assemble multi-section beam steel frame joints, which are characterized in that: according to the location of the joints, the joint forms include three specifications, namely L-shaped joint connection, T-shaped joint connection, and cross-shaped joint connection; The cross-shaped node connection is the connection between the cross-shaped column (3) and the end I-beam (4); specific connection steps: the hoisting equipment vertically and closely contacts the end I-beam (4) and the cross-shaped column (3), The web angle steel (5) is used as a connecting piece to connect the end I-beam (4) and the cross-shaped column (3) together with high-strength bolts. During the installation process, it is necessary to ensure that the end I-beam (4) is perpendicular to the cross-shaped column (3), and then use high-strength bolts to install the flange angle steel (6) to increase the rotational stiffness at the beam-column joint to achieve consolidation; The connection steps of the middle I-beam (7) and the end I-beam (4): the hoisting equipment will contact the middle I-beam (7) and the end I-beam (4) on the same horizontal plane, and the web connection plate (8) Connect the middle I-beam 7 and the end I-beam (4) together with high-strength bolts as the connecting piece of the two-section beam, and then install the high-strength silicone rubber plate (9) and sealing plate (10) with high-strength bolts . 2. The post-earthquake self-resetting multi-section beam steel frame node according to claim 1 is characterized in that: the connection form of the L-shaped node and the T-shaped node are the same as the connection form of the cross-shaped node; only the cross-shaped column (3) L-shaped column 1 and T-shaped column (2) are adopted respectively; the L-shaped node connection is the connection of the frame corner frame column, that is, the L-shaped column 1 is connected with the end I-beam (4); the T-shaped node connection is the frame edge The frame column, that is, the T-shaped column (2) is connected to the end I-beam (4); the cross-shaped node connection is the connection between the frame column in the middle of the frame, that is, the cross-shaped column (3), and the end I-beam (4). 3. The post-earthquake self-resettable multi-segment beam steel frame node according to claim 1, characterized in that: the prestressed arrangement of the nodes: the prestressed cables (11) are sequentially passed through the reserved I-beam reinforcements (12) on the hole, apply the calculated prestress value, anchored on the I-beam reinforcement (12) with a permanent anchor.