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ECC reinforced steel thin-wall structure and preparation method thereof

A thin-walled structure and thin-walled technology, used in building components, manufacturing tools, building structures, etc., can solve the problems of poor fire resistance, insufficient corrosion resistance, and local buckling of thin-walled steel structures, and achieve good durability. , Reduce the cost of post-maintenance, the effect of superior crack control ability

Pending Publication Date: 2021-07-23
SOUTH CHINA UNIV OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in actual engineering, steel thin-walled structures still have disadvantages such as easy local buckling, poor fire resistance, and insufficient corrosion resistance.

Method used

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  • ECC reinforced steel thin-wall structure and preparation method thereof
  • ECC reinforced steel thin-wall structure and preparation method thereof
  • ECC reinforced steel thin-wall structure and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] A steel thin-walled structure reinforced by ECC, comprising an ECC layer and a steel thin-walled layer arranged sequentially from outside to inside; a reinforced grid is arranged inside the ECC layer; the steel thin-walled structure is a closed structure or An open structure with openings. The thickness of the steel thin-walled layer is 2mm-40mm. In this embodiment, the thickness of the thin-walled steel layer is 10mm.

[0036] When the closed structure is adopted, the number of chambers is one. In this embodiment, the number of chambers is one.

[0037] The reinforced mesh is one or more combinations of fiber woven mesh, FRP (Fiber reinforced polymer) mesh and grid. The outer side of the steel thin-walled layer is fixed with welding studs, the welding studs are arranged in a rectangular array, and the distance between the welding studs is an integer multiple of the lattice spacing of the reinforced grid; the reinforced grid is bound to the welding studs by iron wire...

Embodiment 2

[0045] When the closed structure is adopted, the number of chambers is at least two, and the chambers are separated by partitions, and the material of the partitions is the same as the thin-walled steel layer. In this embodiment, the steel thin-walled structure adopts a closed structure, the number of chambers is three, and the chambers are separated by partitions, and the material of the partitions is the same as that of the steel thin-walled layer. The reinforced grid in this embodiment is an FRP (Fiber reinforced polymer) grid.

[0046] Fiber reinforced composite materials (Fiber Reinforced Polymer, referred to as FRP), the existing CFRP, GFRP, AFRP, BFRP and so on. Lightweight and hard, non-conductive, high mechanical strength, less recycling, corrosion resistance.

[0047] In this embodiment, the cross-sections of the three chambers are all rectangular, and the sizes of the three chambers are the same.

[0048] In the thin-walled steel structure of this embodiment, the ...

Embodiment 3

[0051] In this embodiment, the ECC layer is wrapped on the outer side of the thin-walled steel layer with variable thickness, and the thin-walled steel layer is set with variable thickness. In this embodiment, the ECC layer is wrapped with variable thickness on the outer side of the steel thin-walled layer. When the outer ECC layer is thick enough, the local bending stiffness is relatively large, so that the outward local buckling of the steel pipe can be prevented more effectively. Steel thin-walled layer variable thickness setting, according to the change of ECC layer thickness, the thickness of the steel thin-walled layer changes accordingly, cooperates with the constraints of the ECC layer on itself, and avoids internal stress changes, thereby avoiding insufficient strength of the steel thin-walled structure when it is alone compressed The problem of high height and insufficient rigidity.

[0052] The parts not mentioned in this embodiment are the same as those in Embodime...

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Abstract

The invention relates to an ECC reinforced steel thin-wall structure. The ECC reinforced steel thin-wall structure comprises an ECC layer and a steel thin-wall layer which are sequentially arranged from outside to inside; reinforcing grids are arranged in the ECC layer; and the steel thin-wall structure is a closed structure with at least one cavity inside or an open structure with at least one opening. The invention further relates to a preparation method of the ECC reinforced steel thin-wall structure. The ECC layer can restrain the steel thin-wall layer to prevent local buckling of the steel thin-wall layer, and serves as a fire-resistant and durable protective layer of the steel thin-wall layer; the steel thin-wall layer on the inner side serves as a rigid framework and a formwork for pouring the ECC layer on the outer side, and meanwhile the effects of enhancing the rigidity of the ECC layer and sharing loads are achieved; and the structures of the ECC layer and the steel thin-wall layer work cooperatively, so that the steel thin-wall structure has better stress performance, fire resistance and durability; and the invention belongs to the technical field of building structures.

Description

technical field [0001] The invention relates to a building structure, in particular to an ECC-reinforced steel thin-wall structure, and also to a preparation method for the ECC-reinforced steel thin-wall structure. Background technique [0002] In the past ten years, steel structures have been widely used in high-rise buildings and bridge projects due to their advantages of light weight, high strength, and convenient construction, and have achieved good economic benefits. The thin-walled steel structure takes advantage of this feature and makes the steel into a thin-walled structure, which makes the steel structure lighter and uses less material. However, in actual engineering, steel thin-walled structures still have disadvantages such as easy local buckling, poor fire resistance, and insufficient corrosion resistance. [0003] ECC (Engineered Cementitious Composite) is one of the high-performance fiber-reinforced cementitious composite materials developed rapidly in recent...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E04C1/00E04C1/40E04B1/94B28B1/16B28B1/52
CPCB28B1/16B28B1/52E04B1/94E04C1/00E04C1/40
Inventor 陈光明李宁景赵程柳钦赵新宇李召兵胡福南刘伟楠
Owner SOUTH CHINA UNIV OF TECH
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