Composite rib reinforced ECC-composite square steel tube hollow column

Abstract

The invention discloses a composite rib reinforced ECC-composite square steel tube hollow column. The composite rib reinforced ECC-composite square steel tube hollow column comprises a composite square steel tube assembly, an external ECC and a composite rib cage, wherein the composite square steel tube assembly comprises four square steel tubes arranged in a shape like a Chinese character 'Tian', the external ECC is wrapped with the composite square steel tube assembly, the composite rib cage is arranged in the external ECC, the composite rib cage is formed by connecting longitudinal ribs and FRP stirrups, the longitudinal ribs are in lap joint with the inner sides of the FRP stirrups, the longitudinal ribs are perpendicular to the plane where the FRP stirrups are located, the composite rib cage and the external ECC form an outer protective layer, the ratio of the thickness of the external ECC to the length of the outer side of the composite square steel tube assembly is 0.5, and the distance between the surface of the external ECC and the axes of the longitudinal ribs is not smaller than 35mm. The hollow column is high in strength-to-weight ratio, and the square steel tubes are hollow, so that the structure meets the strength requirement with a small section; and the composite square steel tube assembly formed by combining the four square steel tubes is improved in bearing capacity and rigidity compared with a single square steel tube. In addition, the composite rib reinforced ECC-composite square steel tube hollow column has the advantages of being excellent in anti-seismic property, high in durability, good in fire resistance and the like.

Description

technical field [0001] The invention relates to the technical field of load-bearing concrete components of buildings, in particular to a hollow column of a composite bar reinforced ECC-composite square steel tube. Background technique [0002] With the rapid development of my country's social economy, the scale and total amount of infrastructure construction in my country ranks first in the world. Concrete filled steel pipe is a typical steel-concrete composite structure. It has the advantages of high bearing capacity, light weight, good seismic performance, and convenient construction. And other projects have been widely used, and achieved good economic and social benefits. However, in actual engineering, there are problems in the steel pipe concrete structure that the steel pipe is prone to local buckling failure, the durability of the outer steel pipe is poor, and the outer steel pipe needs to be sprayed with expensive fireproof materials. In order to improve the durabi...

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Problems solved by technology

[0005] The invention provides a composite bar reinforced ECC-composite square steel tube hollow column to solve the problems of the low combination effect of the inner and outer structures of the ordinary steel tube concrete composite column, the brittleness and fragility of the outer layer concrete and the poor durability of the composite column and the overall quality of the composite column. Heavy and other issues

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