CN110206369B - A cross-layer and cross-span force-control and buckling-resistant central support structure - Google Patents

Abstract

The invention discloses a cross-layer and cross-span force-controlling and buckling-proof central support structure, comprising a field-shaped frame structure, wherein four frames of the field-shaped frame structure are each provided with an inner frame beam, an inner frame column and a strut, one end of the inner frame column is connected with one end of the inner frame beam and one end of the strut, the other end of the inner frame column and the other end of the inner frame beam are both fixed on the inner wall of the frame, and the other end of the strut is fixed on the inner wall of the frame, wherein the inner frame column, the inner frame beam and the inner wall of the frame form a rectangular inner frame, wherein a metal plate is fixed in the rectangular inner frame, and the rectangular inner frames formed in each frame are all located at a cross-shaped intersection position in the field-shaped frame structure; in the same frame, the connection position between the strut and the inner wall of the frame and the rectangular inner frame are located at a diagonal position of the frame, and the structure has the characteristics of high safety, excellent earthquake resistance, simple structure, small space occupation and low cost.

Description

A cross-layer and cross-span force-control and buckling-resistant central support structure

Technical Field

The invention belongs to the field of building structures and relates to a cross-layer and cross-span force-controlling and buckling-resistant central support structure.

Background Art

The lateral force resisting structure is an indispensable load-bearing component in high-rise and super high-rise buildings. It plays a role in resisting horizontal loads such as wind loads and earthquake loads, and is the key to ensuring the safety and reliability of the entire building. At present, the lateral force resisting structures used in high-rise and super high-rise steel structure buildings mainly include central support, eccentric support, buckling restrained support and steel plate shear wall structures.

Since high-rise buildings are subject to strong wind and seismic loads, the required cross-section of the support is usually large. Therefore, it can usually only be arranged in one direction within a main frame span, and the central support, eccentric support, and buckling-restrained support all have major performance problems. The central support has poor anti-buckling capacity, especially under the action of moderate and large earthquakes, elastic or elastoplastic buckling will inevitably occur, resulting in support failure, causing a decrease in structural stiffness and energy dissipation capacity, affecting structural safety. Eccentric supports can alleviate the buckling problem of the struts by forming energy-absorbing connecting beams through support offsets, but the deformation of the energy-absorbing beam section means that the floor slab will be damaged earlier, and in order to ensure that the energy-absorbing beam section yields first, the remaining components often need to be designed with an oversized cross-section, or even too strong, which increases the construction cost and has limited practical application. Buckling-restrained support is a type of support that achieves the effect of limiting the buckling of the core material by coating the supporting core material with restraining materials or components. It belongs to the category of "structural anti-buckling". It has stronger anti-buckling capacity and better energy dissipation capacity. However, this type of support generally has a larger cross-section than central supports and eccentric supports, and requires more building space, which has a very adverse effect on high-rise and super-high-rise buildings with restricted building area. In addition, due to its complex structure, the engineering cost of this type of support is very high, and it has great limitations in actual engineering applications.

The steel plate shear wall provides rigidity and resists horizontal forces through the tensile field formed by the wall panels, but the tensile field has a very unfavorable oblique effect on the side columns of the steel plate wall. In addition, due to the weak compressive capacity of the wall panels, the overturning moment generated by the horizontal load is mainly resisted by the 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 the instability or destruction of the frame column. Therefore, it is necessary to increase the column section or use a composite structural column with better stability as an edge constraint member, which also limits the application of steel plate shear walls in steel structures. In addition, the bending deformation of the frame beam will be greatly suppressed under the tensile field formed by the upper and lower wall panels, which is similar to being "embedded", making it difficult for the frame beam to develop plastically. The requirement of "strong column and weak beam" in seismic design is difficult to achieve, which reduces the overall seismic performance of the structure. In addition, the wall panels of the steel plate shear wall need to be connected to the frame beam column by bolting or welding at the construction site, which is labor-intensive and difficult to ensure the connection quality, hindering the assembly application of the steel plate shear wall structure.

Summary of the invention

The purpose of the present invention is to overcome the shortcomings of the above-mentioned prior art and provide a cross-layer and cross-span force-controlled anti-buckling central support structure, which has the characteristics of high safety, excellent seismic performance, simple structure, small space occupation and low cost.

To achieve the above-mentioned purpose, the cross-layer and cross-span force-controlling anti-buckling central support structure of the present invention comprises a field-shaped frame structure, wherein the four frames of the field-shaped frame structure are all provided with inner frame beams, inner frame columns and struts, one end of the inner frame column is connected with one end of the inner frame beam and one end of the strut, the other end of the inner frame column and the other end of the inner frame beam are both fixed on the inner wall of the frame, and the other end of the strut is fixed on the inner wall of the frame, wherein the inner frame columns, the inner frame beams and the inner wall of the frame form a rectangular inner frame, wherein a metal plate is fixed in the rectangular inner frame, and the rectangular inner frames formed in each frame are all located at the cross-shaped intersection position in the field-shaped frame structure;

In the same frame, the connection position between the support rod and the inner wall of the frame and the rectangular inner frame are located at the diagonal position of the frame.

The field-shaped frame structure includes three parallel main frame columns, wherein three parallel main frame beams are fixed between two adjacent main frame columns;

One end of the inner frame beam is fixed to the middle main frame column, one end of the inner frame column is fixed to a main frame beam, one end of the support rod is connected to the other end of the inner frame column and the other end of the inner frame beam, and the other end of the support rod is fixed to the connection position between another main frame beam and the outermost main frame column.

The inner wall of the frame is provided with strut nodes for connecting struts.

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

The main frame beam is an H-shaped steel beam or a box-shaped steel beam.

The main frame columns are H-shaped steel columns, box-shaped steel columns, steel tube concrete columns, steel concrete columns or steel tube restrained steel concrete columns.

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

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

The support rods are H-shaped steel support rods, box-shaped steel support rods or round tube steel support rods.

The metal plate is a low yield point steel plate, a high strength steel plate or a foam steel plate;

Alternatively, the metal plate is a steel plate with stiffening ribs, a slit steel plate or a perforated steel plate.

The present invention has the following beneficial effects:

The cross-layer and cross-span force-controlling and anti-buckling central support structure described in the present invention is operated by a rectangular inner frame and a metal plate to form an energy-dissipating force-controlling wall. When the support structure is subjected to horizontal loads such as earthquake loads and wind loads, the struts convert the horizontal loads into tension and pressure, and act 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 greater, the main frame beams yield to further dissipate earthquake energy. In addition, based on the concept of force-controlling and anti-buckling, the present invention uses energy-dissipating force-controlling walls to control the maximum axial force of the struts, and provides them with sufficient deformation space to achieve the structure yielding without buckling under the action of a large earthquake, which has a better effect of preventing buckling, can greatly simplify the structure, reduce space occupancy and reduce costs. At the same time, it should be noted that after the struts achieve anti-buckling, they have a stable compressive resistance and can participate in resisting the overturning moment generated by the horizontal load, reduce the force burden of the main frame columns, and prevent them from being damaged in advance, thereby improving the seismic resistance of the structure.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG1 is a schematic structural 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, and 7 is the strut node.

DETAILED DESCRIPTION

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

With reference to Fig. 1, the cross-layer and cross-span force-controlling and anti-buckling central support structure of the present invention comprises a field-shaped frame structure, wherein four grids of the field-shaped frame structure are each provided with an inner frame beam 3, an inner frame column 4 and a strut 6, one end of the inner frame column 4 is connected to one end of the inner frame beam 3 and one end of the strut 6, the other end of the inner frame column 4 and the other end of the inner frame beam 3 are both fixed to the inner wall of the grid, and the other end of the strut 6 is fixed to the inner wall of the grid, wherein the inner frame column 4, the inner frame beam 3 and the inner wall of the grid form a rectangular inner frame, wherein a metal plate 5 is fixed in the rectangular inner frame, and the rectangular inner frames formed in each grid are all located at a cross-shaped intersection position in the field-shaped frame structure; in the same grid, the connection position between the strut 6 and the inner wall of the grid and the rectangular inner frame are located at the diagonal position of the grid.

The field-shaped frame structure includes three parallel main frame columns 2, wherein three parallel main frame beams 1 are fixed between two adjacent main frame columns 2; one end of the inner frame beam 3 is fixed to the middle main frame column 2, one end of the inner frame column 4 is fixed to a main frame beam 1, one end of the support rod 6 is connected to the other end of the inner frame column 4 and the other end of the inner frame beam 3, and the other end of the support rod 6 is fixed to the connection position between another main frame beam 1 and the outermost main frame column 2.

The inner wall of the frame is provided with a strut node 7 for connecting the struts 6; the metal plate 5 is fixed to the inner side of the rectangular inner frame.

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 tube concrete column, a steel concrete column or a steel tube constrained steel concrete column; 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; the strut 6 is an H-shaped steel strut, a box-shaped steel strut or a round tube steel strut; the metal plate 5 is a low yield point steel plate, a high strength steel plate or a foam steel plate; or the metal plate 5 is a steel plate with stiffening ribs, a slit steel plate or a holed steel plate.

An energy-absorbing and force-controlling wall is formed by a rectangular inner frame and a metal plate 5. When the supporting structure is subjected to horizontal loads such as earthquake loads and wind loads, the struts 6 convert the horizontal loads into tension and pressure and act on the rectangular inner frame. The metal plate 5, the inner frame beam 3 and the inner frame column 4 yield first to dissipate energy. When the horizontal load is greater, the main frame beam 1 yields to further dissipate the earthquake energy. The connection position between the struts 6 and the inner wall of the frame and the rectangular inner frame is located at the diagonal position of the frame, and the force transmission effect is better.

Claims (6)

1. A cross-layer and cross-span force-controlling anti-buckling central support structure, characterized in that it comprises a 'T-shaped frame structure, wherein four frames of the 'T-shaped frame structure are each provided with an inner frame beam (3), an inner frame column (4) and a strut (6), one end of the inner frame column (4) is connected to one end of the inner frame beam (3) and one end of the strut (6), the other end of the inner frame column (4) and the other end of the inner frame beam (3) are both fixed to the inner wall of the frame, and the other end of the strut (6) is fixed to the inner wall of the frame, wherein the inner frame column (4), the inner frame beam (3) and the inner wall of the frame form a rectangular inner frame, wherein a metal plate (5) is fixed in the rectangular inner frame, and the rectangular inner frames formed in each frame are all located at a cross-shaped intersection position in the 'T-shaped frame structure; In the same frame, the connection position between the support rod (6) and the inner wall of the frame and the rectangular inner frame are located at the diagonal position of the frame; The field-shaped frame structure comprises three parallel distributed main frame columns (2), wherein three parallel distributed main frame beams (1) are fixed between two adjacent main frame columns (2); One end of the inner frame beam (3) is fixed to the middle main frame column (2), one end of the inner frame column (4) is fixed to a main frame beam (1), one end of the support rod (6) is connected to the other end of the inner frame column (4) and the other end of the inner frame beam (3), and the other end of the support rod (6) is fixed to the connection position between another main frame beam (1) and the outermost main frame column (2); The inner wall of the frame is provided with a support rod node (7) for connecting the support rod (6); 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. 2. The cross-layer and cross-span force-control and anti-buckling central support structure according to claim 1 is characterized in that the metal plate (5) is fixed to the inner side of the rectangular inner frame. 3. The cross-layer and cross-span force-controlling and anti-buckling central support structure according to claim 2 is characterized in that the main frame beam (1) is an H-shaped steel beam or a box-shaped steel beam. 4. The cross-layer and cross-span force-control and anti-buckling central support structure according to claim 1 is characterized in that the main frame column (2) is an H-shaped steel column, a box-shaped steel column, a steel tube concrete column, a steel concrete column or a steel tube constrained steel concrete column. 5. The cross-layer and cross-span force-control and anti-buckling central support structure according to claim 1, characterized in that the support rod (6) is an H-shaped steel support rod, a box-shaped steel support rod or a round tube steel support rod. 6. The cross-layer and cross-span force-control and anti-buckling central 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 foam steel plate; Alternatively, the metal plate (5) is a steel plate with stiffening ribs, a slit steel plate or a perforated steel plate.