CN103669594B - Steel Framed Structure with Special-Shaped Columns node is easily repaired after a kind of shake - Google Patents

Abstract

Easily repair steel Framed Structure with Special-Shaped Columns node after a kind of shake, double flute girder steel, by beam-ends shrouding, is connected with hetermorphiscal column, forms the type of attachment of the full bolt of no-welding-seam; To no-welding-seam full bolt joint Shi Hanzhang cable wire, after forming the shake of prestressing force Self-resetting, easily repair node.Adopt prestressing force Self-resetting joint form, achieve the Self-resetting of shake posterior nodal point, greatly reduce the rear rehabilitation cost of shake; Improve the anti-seismic performance of node, thus improve the anti-seismic performance of frame structure system; The plurality of advantages such as compared with traditional steel building node, it is high that it has security performance, and environment pollution is little, and the few and construction costs of security incident is low.

Description

A post-earthquake easy-to-repair steel special-shaped column frame structure node

technical field

The invention relates to a steel special-shaped column frame structure node, which belongs to the technical field of earthquake resistance and disaster reduction, and in particular to a steel special-shaped column frame structure node that is easy to repair after an earthquake.

Background technique

The collapse of buildings in earthquakes is the main reason that threatens people's lives and causes property losses. The earthquakes in Wenchuan and Ya’an showed that the seismic performance of concrete structures is not good. At present, my country’s steel structures are developing rapidly, especially the prestressed steel structure technology is at the international advanced level. The world record for the largest structural span leads the development of prestressed steel structures. Making full use of the advantages of prestressing technology and applying it to the steel frame joints will improve the seismic performance and self-resetting ability of the joints, and the design of the steel frame joints directly affects the quality of the steel structure. If the components are not damaged but the nodes have failed, the original intention of the structure's seismic design cannot be achieved, let alone the design concept of "strong nodes, weak components".

On January 17, 1994, an earthquake occurred in Los Angeles, USA, and more than 100 steel structure buildings fractured at the beam-column joints. The cracks usually originate from the beam-column joint welds. One year later, an earthquake occurred in Hanshin, Japan, and the post-earthquake investigation showed that the root cause of most of the fractures was problems in the design and construction of the joints. These two earthquakes prompted scholars to study and adjust the design of nodes. Before the Los Angeles earthquake, this kind of joint was cheap and easy to construct, and it was generally believed that this joint form could make better use of material ductility, promote plastic hinges at the beam ends, prevent the joint from being damaged, and realize "strong joint, weak member". " design thinking. However, this kind of joint form does not show proper ductility in earthquakes, but brittle fracture occurs prematurely, and the cracks usually originate from the welds of beam-column joints. After analysis, it is found that the root cause of most of the fractures lies in the design and construction of the joints. Ten years after the Los Angeles earthquake, the performance of beam-to-column connections and their influence on steel frame structures has become one of the key research topics in the field of steel structures.

Contents of the invention

The purpose of the present invention is to provide a post-earthquake easy-to-repair steel special-shaped column frame joint, the purpose of which is to improve the seismic performance of the structure, reduce the difficulty of post-earthquake repair and maintenance costs; the basic composition of post-earthquake easy-to-repair steel special-shaped column frame joints includes frame beams , columns, prestressed components, angle steel or friction components; the specific structure is that during the construction process, the top and bottom angle steels are installed first, and then the high-strength steel tie rods are installed and stretched. Stress, this kind of precompressive stress will provide a larger resistance to bending moment for the node, and the friction force of the contact surface of the beam and column will provide a greater resistance to shear force for the node; the backing plate is installed between the end of the beam and the column, that is, the beam Column connecting plate to prevent excessive local stress caused by direct contact between beam web and column.

The basic principle of prestressed self-resetting joints: When the earthquake action reaches a certain level, the contact surface of the beam and column opens, and the angle steel undergoes plastic deformation and consumes energy, thereby avoiding damage to the main components such as the beam and column. After the earthquake, the structure returns to its original vertical position under the action of prestress. The research shows that if the energy-dissipating member is designed at the web or flange of the beam, the stiffness and strength of the joint is similar to that of the fully welded joint, and it has good ductility; the post-tensioned self-resetting frame joint can obtain similar strength to the traditional steel frame and stiffness; however, this self-resetting node does not require welding at the construction site, and all of them are connected by bolts or welded in the factory first, and then bolted at the construction site.

The initial stiffness of the joint is basically equivalent to that of the welded joint. When the interstory displacement angle reaches 5%, the beams and columns of the main structure remain elastic, and the angle steel enters a plastic state to dissipate energy. After the earthquake, the joint can return to its initial position.

The application of prestress enables the steel frame structure to obtain a higher safety factor; the main advantages of prestressed joints: (1) have the ability of self-centering, which greatly reduces the residual deformation after the earthquake; (2) the initial stiffness is relatively large Similar to all-welded joints, it is equivalent to rigid joints; (3) Beams and columns remain elastic under earthquakes, and the inelastic deformation is concentrated at the joints, and the energy dissipation mechanism is provided through the inelastic deformation of the joints; (4) Greatly reduces post-earthquake repairs difficulty and cost.

In order to achieve the above-mentioned purpose, the technical solution adopted by the present invention is a post-earthquake easy-to-repair steel special-shaped column frame joint. The beam involved is a double-channel steel beam made of section steel. Spliced with beam end webs.

The post-earthquake easy-to-repair steel special-shaped column frame joints mainly include L-shaped, T-shaped, and cross-shaped joints. The L-shaped joint connection is the connection between the L-shaped special-shaped column at the corner of the frame and the double-channel steel beam; the specific connection steps are: Beam-column connecting plate The beam end web is welded first in the factory, the beam-column connection plate is perpendicular to the beam end web, the beam end web is located in the middle of the beam-column connection plate, and its height is equal to the height of the profile steel web of the double-channel steel beam, bolted on site The welded beam-column connection plate and the beam end web are fixed on the flange of the L-shaped special-shaped column; the double-channel steel beam is composed of two channel steel beams, and when the double-channel steel beam is connected to the special-shaped column, a single The channel steel is connected separately. First, connect a channel steel with the L-shaped special-shaped column with equal-leg angle steel. The channel steel is perpendicular to the flange of the L-shaped special-shaped column. After one channel steel is connected, the other is connected in the same way. Channel steel; after the double channel steel beam is connected with the L-shaped special-shaped column, the two channel steels shall be connected into a whole with the beam end web, and the two channel steel shall be connected with the beam end web located in the middle of the two channel steel with bolts; T-shaped nodes, cross-shaped node connections are the same as L-shaped.

There are three forms of special-shaped columns, which are L-shaped special-shaped columns, T-shaped special-shaped columns, and cross-shaped special-shaped columns; the joints of steel special-shaped columns that are easy to repair after the earthquake have three types of joints, namely L-shaped connection and T-shaped Connection, cross-shaped connection; L-shaped joint is the connection between L-shaped special-shaped column and double-channel steel beam; T-shaped joint is the connection between T-shaped special-shaped column and double-channel steel beam; cross-shaped joint is the connection between cross-shaped special-shaped column and double-channel steel beam ; The layout of the joint prestress is to connect the various joints according to the above method. After the frame is basically formed, the steel cables are passed through the holes reserved on the flange of the special-shaped column in turn, and the calculated prestress value is applied. The permanent anchorage is anchored on the flange of the special-shaped column.

Compared with the prior art, the present invention has the following beneficial effects.

1. In the post-earthquake easy-to-repair steel special-shaped column frame joints, the beams used are all shaped steel beams. Because the gaps in the abdomen of the beams are large, it is convenient for pipelines to pass through, which effectively increases the net height of the room.

2. It is easy to repair the steel special-shaped column frame joints after the earthquake. The bolts are used for on-site assembly, and the traditional on-site welding method and concrete pouring method are cancelled, which effectively ensures the construction quality and completely avoids the environmental pollution caused by concrete pouring and steel welding. , realizing the three-no standards of "no water, no fire, no dust" in on-site construction, reducing the occurrence of fire and other hazardous accidents; when the components are dismantled, the invention can efficiently recycle, reduce construction waste, and truly realize In line with the concept of green environmental protection, it is a green and sustainable steel structure node.

3. An easily repairable post-earthquake steel special-shaped column frame joint, which adopts the prestressed self-resetting joint form, realizes the self-resetting of the post-earthquake joint, greatly reduces the post-earthquake repair cost; improves the seismic performance of the joint, thereby improving the frame structure system seismic performance.

4. The post-earthquake easy-to-repair steel special-shaped column frame joint proposed by the present invention is a subversion of the traditional steel structure building joint, and fully exerts the advantages of the steel structure; compared with the traditional steel structure building joint, it has high safety performance, It has many advantages such as little environmental pollution, few safety accidents and low construction cost.

Description of drawings

Fig. 1 is a schematic diagram of a channel-shaped steel girder of the present invention.

Fig. 2 is a split schematic diagram of the L-shaped prestressed self-resetting node of the present invention.

Fig. 3 is a schematic diagram of splitting the T-shaped prestressed self-resetting node of the present invention.

Fig. 4 is a split schematic diagram of the cross-shaped prestressed self-resetting node of the present invention.

Fig. 5 is a schematic diagram of an L-shaped column of the present invention.

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

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

Fig. 8 is an exploded schematic diagram of an L-shaped column node of the present invention.

Fig. 9 is an exploded schematic diagram of a T-shaped column node of the present invention.

Fig. 10 is an exploded schematic diagram of cross-shaped column nodes of the present invention.

In the figure: 1. Double channel steel beam, 2. Equal leg angle steel, 3. Beam-column connecting plate, 4. Beam end web, 5. Single channel steel, 6. Steel cable, 7. L-shaped special-shaped column, 8. T-shaped special-shaped column, 9. Cross-shaped special-shaped column.

detailed description

The present invention will be further described below in conjunction with accompanying drawing.

As shown in Fig. 1, it is the channel steel shaped steel beam schematic diagram of the present invention, in the post-earthquake easily repairable steel special-shaped column frame joint, the beam involved is a double channel steel beam 1 made of profile steel, and the double channel steel beam 1 is made of The single channel steel is spliced at the beam end with the beam end web.

As shown in accompanying drawings 2 to 4, among the post-earthquake easy-to-repair steel special-shaped column frame nodes according to the present invention, the post-earthquake easy-to-repair steel special-shaped column frame nodes mainly include L-shaped, T-shaped, and cross-shaped node forms, respectively. The split diagrams of the above three node forms are listed; the L-shaped node connection is the connection between the L-shaped special-shaped column 7 at the corner of the frame and the double-channel steel beam 1; the specific connection steps are: the beam-column connecting plate 3 and the beam end web 4 The factory welds first, the beam-column connecting plate 3 is perpendicular to the beam-end web 4, and the beam-end web 4 is located in the middle of the beam-column connecting plate 3, and its height is equal to the height of the profile steel web of the double-channel steel beam 1. The beam-column connecting plate 3 and the beam end web 4 are fixed on the flange of the L-shaped special-shaped column 7; the double-channel steel beam 1 is composed of two channel steel beams, and when the double-channel steel beam 1 is connected to the column, Adopt the mode that single channel steel 5 is respectively connected, first a channel steel is connected with L-shaped special-shaped column 7 with equal limb angle steel 2, and the flange of channel steel and L-shaped special-shaped column 7 is vertical, after a channel steel is connected, Connect another channel steel in the same way; after the double channel steel beam 1 is connected with the L-shaped special-shaped column 7, the two channel steels will be connected into a whole with the beam end web 4, and the two channel steels will be connected with the two channels with bolts. The beam end web in the middle of the channel steel is connected by 4; the connection of T-shaped joints and cross-shaped joints is the same as that of L-shaped joints.

As shown in accompanying drawings 5-10, in the post-earthquake easily repairable steel special-shaped column frame joints according to the present invention, there are three types of special-shaped columns, which are L-shaped special-shaped column 7, T-shaped special-shaped column 8, and cross-shaped special-shaped column 9. Easy-to-repair steel special-shaped column frame joints after the earthquake, the joint forms include three specifications, namely L-shaped connection, T-shaped connection, and cross-shaped connection; the L-shaped joint is the connection between L-shaped special-shaped column 7 and double-channel steel beam 1 ; The T-shaped joint is that the T-shaped special-shaped column 8 is connected with the double-channel steel beam 1; the cross-shaped joint is that the cross-shaped special-shaped column 9 is connected with the double-channel steel beam 1; Pass through the holes reserved on the flange of the special-shaped column in turn, apply the calculated prestress value, and anchor on the flange of the special-shaped column with permanent anchors.

Claims (1)

1. easily repair steel Framed Structure with Special-Shaped Columns node after a shake, it is characterized in that: beam is the double flute girder steel (1) be made up of shaped steel, double flute girder steel (1) is spliced at beam-ends web plate by two single channel-section steels (5);

Easily repair steel Frame joints with special-shaped column after shake and mainly comprise L shape, T-shaped, crisscross joint form, it is that frame corner L shape hetermorphiscal column (7) is connected with double flute girder steel (1) that L shape node connects; Concrete Connection Step is, beam-to-column joint plate (3) welds in factory in advance with web plate (4), beam-to-column joint plate (3) is perpendicular to web plate (4), web plate (4) is positioned at the middle part of beam-to-column joint plate (3), it highly equals the shape steel web height of double flute girder steel (1), and the beam-to-column joint plate (3) welded together and web plate (4) are fixed on L shape hetermorphiscal column (7) edge of a wing by scene bolt; Double flute girder steel (1) is made up of two steel channel beams, when double flute girder steel (1) is connected with post, adopt the mode that single channel-section steel (5) connects respectively, first channel-section steel angle with equal legs (2) is connected with L shape hetermorphiscal column (7), channel-section steel is vertical with the edge of a wing of L shape hetermorphiscal column (7), after a channel-section steel connects, same mode connects another root channel-section steel; After double flute girder steel (1) is connected with L shape hetermorphiscal column (7), two channel-section steel web plates (4) connect into entirety, are connected by two channel-section steels with bolt with the web plate (4) be positioned in the middle of two channel-section steels; T-section point, crisscross joint connect identical with L shape;

The form of hetermorphiscal column has three kinds, is respectively L shape hetermorphiscal column (7), T-shaped hetermorphiscal column (8), cross hetermorphiscal column (9); Easily repair steel Frame joints with special-shaped column after shake, its joint form comprises three kinds of specifications, is respectively the connection of L shape, T-shaped connects, cross connects; L shape node is that L shape hetermorphiscal column (7) is connected with double flute girder steel (1); T-section point is that T-shaped hetermorphiscal column (8) is connected with double flute girder steel (1); Crisscross joint is that cross hetermorphiscal column (9) is connected with double flute girder steel (1); Connect the node that each is multi-form in the manner described above, by steel cable (6) successively through the hole be reserved on the hetermorphiscal column edge of a wing, apply the prestress value calculated, be anchored on the hetermorphiscal column edge of a wing with permanent ground tackle.