CN110206370A - One kind is more across the control anti-buckling eccentrically braces structure of power - Google Patents

Abstract

The invention discloses a span control force anti-buckling eccentric support structure, which comprises three main frame columns, wherein two main frame beams are arranged between two adjacent main frame columns; Inner frame columns, two main frame beams and two struts are arranged in the area surrounded by two main frame beams. This structure has high safety, excellent seismic performance, simple structure, small space occupation, and does not affect layout and low cost features.

Description

A buckling-resistant eccentric support structure with cross-span control

technical field

The invention belongs to the field of building structures, and relates to an eccentric support structure with span control force and anti-buckling.

Background technique

The anti-lateral force structure plays a role in resisting horizontal loads such as wind load and earthquake load in the building structure, and is the key to ensuring the safety and reliability of the entire structure. At present, the lateral force-resisting structures used in multi-story steel structures mainly include support structures and steel plate shear wall structures, and can be subdivided into central support, eccentric support, and buckling constraints according to the different mechanical properties and structural forms. Braces (buckling-resistant braces), non-stiffened steel plate walls, stiffened steel plate walls, slotted steel plate walls, and buckling-resistant steel plate walls.

The buckling resistance of the central support is poor, especially under the action of moderate and large earthquakes, elastic or elastic-plastic buckling will inevitably occur, resulting in failure of the support, resulting in a decrease in structural stiffness and energy dissipation capacity, affecting structural safety. The traditional eccentric support forms an energy-dissipating connecting beam through the support offset to dissipate energy. After the energy-dissipating beam section undergoes a large deformation, it provides a movement space for the strut to alleviate the buckling problem of the strut. However, the deformation of the energy-dissipating beam section means that the floor Failure will occur earlier, and in order to ensure that the energy-dissipating beam section yields first, the remaining components often need to be designed with an excessively large cross-section, or even excessively strong, which increases construction costs and has limited practical application. Buckling-restrained bracing is a kind of bracing that limits the buckling effect of the core material by coating the restraining material or components on the outside of the bracing core material. It belongs to the category of "structural buckling resistance", and it has stronger buckling resistance and better energy consumption. However, this type of support generally has a large cross-section, takes up more building space, and has a relatively complex structure and high engineering cost, so it has great limitations in practical engineering applications.

Steel plate shear walls (non-stiffened, stiffened, anti-buckling) provide rigidity to resist horizontal force through the tension field formed by the wall panels, but the tension field has a very unfavorable oblique effect on the side columns of the steel plate wall, and because the wall panels have no compression resistance The overturning moment generated by the horizontal load is mainly resisted by the force couple formed by the axial force of the frame column, which makes the internal force in the column extremely large, which can easily lead to instability or damage of the frame column. Therefore, it is necessary to increase the column section or use concrete filled steel pipe. Combined structural columns with better stability such as columns are used as edge restraint members, which also limits the application of steel plate shear walls in steel structures. In addition, the bending deformation of the frame beams under the action of the tension field formed by the upper and lower wall panels will be largely suppressed, similar to being "embedded", so that the plasticity of the frame beams is not fully developed, and the frame columns often precede the frame beams. The formation of plastic hinges makes it difficult to realize the requirement of "strong columns and weak beams" in seismic design, which reduces the overall seismic performance of the structure. In addition, the wall panels of steel plate shear walls need to be connected to frame beams and columns by bolting or welding at the construction site. The workload is heavy and the connection quality is not easy to guarantee, which hinders the assembly application of steel plate wall structures. Slotted steel plate shear wall panels have little influence on side columns, but due to their weak stiffness and bearing capacity, they are rarely used in practice.

In addition to the above shortcomings, the current anti-lateral force structure will also affect the realization of building functions. It is the most basic functional requirement of a building to provide lighting, ventilation, and meet the needs of people entering and exiting through the arrangement of doors and windows. However, whether it is a brace or a steel plate shear wall structure, it usually needs to occupy the entire wall, which seriously affects the arrangement of door and window openings. This defect is particularly prominent in multi-story steel structure residential buildings and prefabricated steel structure residential buildings. Existing lateral force-resistant structures, whether they are support structures or steel plate shear wall structures, usually occupy the entire wall space, making it difficult to open doors and windows on the walls where the lateral force-resistant structures are arranged, resulting in a "black room" effect building use. This has a particularly prominent impact on multi-high-rise steel structure residential buildings and prefabricated residential buildings. Residential buildings have small column spacing, changeable house types, higher lighting and ventilation needs, and few walls that do not need to open doors or windows. Some lateral force-resistant structures are difficult to meet the diverse needs of building layouts.

Contents of the invention

The purpose of the present invention is to overcome the above-mentioned shortcomings of the prior art, and provide an eccentric support structure with span control force and anti-buckling. The characteristics of low cost.

In order to achieve the above purpose, the eccentric support structure of the present invention includes three parallel and sequentially distributed main frame columns, wherein two main frame beams are arranged between two adjacent main frame columns;

In the area surrounded by two adjacent main frame columns and two main frame beams in between, there are inner frame columns, two main frame beams and two struts, wherein the two inner frame beams are arranged in parallel, and the two One end of the inner frame beam is fixed on the inner main frame column, the other end of the upper inner frame beam is fixed on the upper end of the inner frame column, the other end of the lower inner frame beam is fixed on the lower end of the inner frame column, the first One end of the first brace is connected to the upper end of the inner frame column and the end of the upper inner frame beam, the other end of the first brace is fixed to the middle of the top main frame beam, one end of the second brace is connected to the inner frame The lower end of the column is connected to the end of the lower inner frame beam, and the other end of the second brace is fixed to the middle of the bottom main frame beam.

The inner main frame columns and the inner frame beams and inner frame columns connected thereto form a rectangular inner frame, wherein a metal plate is fixed inside the rectangular inner frame.

Between the middle main frame column and an outer main frame column, a door opening and a first window opening are arranged in the area surrounded by the outer main frame column, two struts and two main frame beams;

Between the middle main frame column and another outer main frame column, a second window hole is arranged in the area surrounded by the outer main frame column, two struts and two main frame beams. The main frame beams are provided with strut nodes for fixing the struts.

The metal plate is fixed on the inner side of the rectangular inner frame.

The main frame beam is H-shaped steel beam or box-shaped steel beam;

The main frame column is an H-shaped steel column, a box-shaped steel column, a steel pipe concrete column, a steel concrete column or a steel pipe bound steel concrete column.

The inner frame beam is H-shaped steel beam or box-shaped steel beam;

The inner frame columns are H-shaped steel columns or box-shaped steel columns.

The struts are H-shaped steel struts or box-shaped steel struts.

The metal plate is a low-yield point steel plate, a high-strength steel plate or a foamed steel plate.

The metal plate is a steel plate with stiffeners, a slotted steel plate or a perforated steel plate.

The present invention has the following beneficial effects:

During the specific operation of the span control force anti-buckling eccentric support structure described in the present invention, the energy dissipation force control wall is composed of a rectangular inner frame and metal plates. When the support structure is subjected to horizontal loads such as earthquake loads and wind loads, the struts The horizontal load is converted into tension and compression, and acts on the rectangular inner frame. The metal plates, inner frame beams and inner frame columns yield first to dissipate energy. When the horizontal load is larger, the main frame beams yield to further dissipate the seismic energy . It should be noted that, based on the concept of force control and buckling prevention, the present invention uses the energy-dissipating force control wall to control the maximum internal force of the struts and provide enough deformation space for the structure to yield without buckling under the action of a large earthquake. , the anti-buckling effect is better, and at the same time, the structure can be greatly simplified, the space occupied and the cost can be reduced. In addition, after the brace is anti-buckling, it has a stable compressive capacity and can participate in resisting the overturning moment generated by the horizontal load , reduce the stress burden on the main frame columns, prevent the main frame columns from breaking in advance, and thus improve the seismic capacity of the structure.

Description of drawings

Fig. 1 is a structural schematic diagram of the present invention.

Among them, 1 is the main frame beam, 2 is the main frame column, 3 is the inner frame beam, 4 is the inner frame column, 5 is the metal plate, 6 is the strut, 7 is the strut node, 8 is the door opening, and 91 is the first Window hole, 92 is the second window hole.

Detailed ways

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

Referring to Fig. 1 , the span control force anti-buckling eccentric support structure of the present invention includes three parallel main frame columns 2 distributed in sequence, wherein two main frame beams 1 are arranged between two adjacent main frame columns 2 ; An inner frame column 4, two main frame beams 1 and two struts 6 are arranged in the area surrounded by two adjacent main frame columns 2 and two main frame beams 1 therebetween, wherein the two inner frame The beams 3 are arranged in parallel, and one end of the two inner frame beams 3 is fixed on the inner main frame column 2, the other end of the upper inner frame beam 3 is fixed on the upper end of the inner frame column 4, and the lower inner frame beam 3 The other end is fixed on the lower end of the inner frame column 4, one end of the first strut 6 is connected with the upper end of the inner frame column 4 and the other end of the upper inner frame beam 3, and the other end of the first strut 6 is fixed on the In the middle of the top main frame beam 1, one end of the second strut 6 is connected to the lower end of the inner frame column 4 and the other end of the lower inner frame beam 3, and the other end of the second strut 6 is fixed to the bottom main frame The middle of beam 1.

The inner main frame column 2 and the inner frame beam 3 and inner frame column 4 connected thereto form a rectangular inner frame, wherein, a metal plate 5 is fixed inside the rectangular inner frame; the main frame beam 1 is provided with a brace 6 for fixing The strut node 7.

Between the middle main frame column 2 and an outer main frame column 2, a door opening 8 and a first window opening are arranged in the area surrounded by the outer main frame column 2, two struts 6 and two main frame beams 1 91; Between the middle main frame column 2 and the other outer main frame column 2, a second window hole is set in the area surrounded by the outer main frame column 2, two struts 6 and two main frame beams 1 92.

The metal plate 5 is fixed on the inner side of the rectangular inner frame by welding, bolt connection, bolt-welding mixed connection or rivet connection; the main frame beam 1 is H-shaped steel beam or box-shaped steel beam; the main frame column 2 is H-shaped steel column, box-shaped steel column Column, steel pipe concrete column, steel concrete column or steel pipe bound steel concrete column; inner frame beam 3 is H-shaped steel beam or box-shaped steel beam; inner frame column 4 is H-shaped steel column or box-shaped steel column; strut 6 is H-shaped steel A strut or a box-shaped steel strut; the metal plate 5 is a steel plate with a low yield point, a high-strength steel plate or a foamed steel plate, or the metal plate 5 is a steel plate with stiffeners, a slotted steel plate or a perforated steel plate.

In addition, the struts 6 are connected to the middle part of the main frame beam 1, so that there is sufficient space for arranging doors and windows in the main frame, thereby greatly improving the flexibility of the lateral force-resistant structure arrangement in the building.

Claims (9)

1. A span control force anti-buckling eccentric support structure, characterized in that it comprises three parallel and sequentially distributed main frame columns (2), wherein two adjacent main frame columns (2) are provided with two Main frame beam (1); Inner frame columns (4), two main frame beams (1) and two struts ( 6), wherein, two inner frame beams (3) are arranged in parallel, and one ends of the two inner frame beams are fixed on the inner main frame column (2), and the other end of the upper inner frame beam (3) is fixed on The upper end of the inner frame column (4), the other end of the lower inner frame beam (3) is fixed to the lower end of the inner frame column (4), and one end of the first strut (6) is connected to the upper end of the inner frame column (4). and the end of the upper inner frame beam (3), the other end of the first strut (6) is fixed to the middle of the top main frame beam (1), and one end of the second strut (6) is connected to the inner The lower end of the frame column (4) is connected to the end of the lower inner frame beam (3), and the other end of the second brace (6) is fixed to the middle part of the bottom main frame beam (1). 2. The span control force anti-buckling eccentric support structure according to claim 1, characterized in that the inner main frame column (2) and the inner frame beam (3) and inner frame column (4) connected to it form a rectangular shape The inner frame, wherein, a metal plate (5) is fixed inside the rectangular inner frame. 3. The span control force anti-buckling eccentric support structure according to claim 1, characterized in that, between the middle main frame column (2) and an outer main frame column (2), the outer main frame column (2), a door opening (8) and a first window opening (91) are arranged in the area surrounded by two struts (6) and two main frame beams (1); Between the middle main frame column (2) and another outer main frame column (2), the outer main frame column (2), two struts (6) and two main frame beams (1) enclose A second window hole (92) is arranged in the region. 4. The span-control force-anti-buckling eccentric support structure according to claim 1, characterized in that, the main frame beam (1) is provided with strut nodes (7) for fixing the struts (6). 5. The span control force anti-buckling eccentric support structure according to claim 2, characterized in that the metal plate (5) is fixed on the inner side of the rectangular inner frame. 6. The span control force anti-buckling eccentric support structure according to claim 1, characterized in that the main frame beam (1) is an H-shaped steel beam or a box-shaped steel beam; The main frame column (2) is an H-shaped steel column, a box-shaped steel column, a steel pipe concrete column, a steel concrete column or a steel pipe bound steel concrete column. 7. The over-span control force anti-buckling eccentric support structure according to claim 1, characterized in that, The inner frame beam (3) is an H-shaped steel beam or a box-shaped steel beam; The inner frame column (4) is an H-shaped steel column or a box-shaped steel column. 8. The eccentric strut structure according to claim 1, characterized in that the struts (6) are H-shaped steel struts or box-shaped steel struts. 9. The span control force anti-buckling eccentric support structure according to claim 1, characterized in that the metal plate (5) is a low yield point steel plate, a high strength steel plate or a foamed steel plate; The metal plate (5) is a steel plate with stiffeners, a slotted steel plate or a perforated steel plate.