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Prestress CFST thin wall box-type section component

A technology of prestressing and prestressing steel bar, which is applied in the direction of long strip structural components, building components, arched beams, etc. for load bearing, can solve the problems of poor stability, low rigidity, welding residual stress, etc., and achieve weight reduction, Good seismic performance and fast construction speed

Inactive Publication Date: 2017-07-21
NANJING INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The object of the present invention is to provide a thin-walled box-section member of prestressed steel tube concrete (CFST) to solve the problems of welding residual stress, poor stability and low rigidity of steel thin-walled box-shaped members

Method used

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  • Prestress CFST thin wall box-type section component

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] combine figure 1 , figure 2 As shown, the prestressed CFST member of this embodiment is a closed box section, the steel pipe is located at the corner of the section, and the steel pipe 4 is welded to the thin-walled steel plate 3 . The steel pipe 4 located in the middle of the entire section and on the axial compression side is filled with concrete 5 to form the steel pipe concrete 6 to bear the compressive stress caused by the bending moment; the steel pipe 4 located in the entire section and on the axial tension side is provided with prestressed steel bars 2, Anchorages 1 are provided at both ends of the component, and the stiffness and bending capacity of the entire component can be effectively improved after prestressing the component. The cross-section of the components in this embodiment is rectangular as a whole, and can also be designed as other polygonal cross-sections such as squares, triangles, and trapezoids. The components can be disassembled into several...

Embodiment 2

[0040] combine image 3 , Figure 4 The difference between the structure of this embodiment and Example 1 is that all steel pipes 4 are filled with concrete 5 to form steel pipe concrete 6, and the prestressed steel bars 2 are arranged near the edge of the tension zone in the box-shaped space. The figure is a rectangular cross-section member, and it can also be designed as a square, triangle, trapezoid and other polygonal cross-section forms. Other components are the same as in Embodiment 1.

Embodiment 3

[0042] combine Figure 5 , Image 6 As shown, this implementation part is a prestressed CFST box section member bearing axial pressure, prestressed steel bars 2 are arranged in each steel pipe 4, and concrete 5 is filled in the steel pipe 4 and the box section to form a steel tube concrete 6. The figure is a rectangular cross-section member, and it can also be designed as a square, triangle, trapezoid and other polygonal cross-section forms. Other components are the same as in Embodiment 1.

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Abstract

The invention relates to a prestress CFST thin wall box-type section component and belongs to prestress concrete-filled steel tube components. The prestress CFST thin wall box-type section component comprises a steel tube, a thin wall steel plate, concrete, prestress anchorage devices and prestress steel bars. The thin wall box-type section is formed by the steel tube and the thin wall steel plate. The steel tube is located at the corner of the thin wall box-type section. The interiors of the closed spaces separated by the steel tube and the thin wall steel plate are filled with the concrete to form concrete-filled steel tubes. The prestress steel bars are arranged in the steel tube or the thin wall box-type section, the prestress anchorage devices are located at the two ends of the component, and the steel tube and the thin wall steel plate are welded together. According to the component, the steel tube is arranged at the corner of the whole section, and the problem that serious residual stress exists at the corner of the steel tube is effectively solved. Once the interiors of the steel tube and the thin wall box-type section are filled with the concrete to form the concrete-filled steel tube components, the composite effect between the concrete and steel can be sufficiently exerted. The prestress CFST thin wall box-type section component has the characteristics of being light, high in strength, good in anti-seismic property, high in construction speed, capable of being reused and the like.

Description

technical field [0001] The invention relates to a prestressed steel pipe concrete member, in particular to a prestressed CFST thin-walled box section member. Background technique [0002] At present, the concrete filled steel pipe members in the housing construction in our country mainly use the inner filling concrete of steel pipes or square steel pipes as structural load-bearing members. Concrete-filled steel tube members can be used not only as flexural members, axial compression members, but also as compression-bending (tension-bending) members and applied to various parts of the building structure. There are at least three problems in traditional steel thin-walled box members. One is that butt welds are used for welding the steel plates at the corners. For thick plates, the welding process is complicated, and it is easy to produce large welding residual stress and welding residual deformation; When the section height is high, the steel plate of the web is prone to loca...

Claims

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Application Information

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IPC IPC(8): E04C3/293E04C3/46
CPCE04C3/293E04C3/46
Inventor 张文福过轶青何培玲肖同亮耿方方臧华赵文艳
Owner NANJING INST OF TECH
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