Multi-inner-core pressure forming concrete filled steel tube composite member and manufacturing method thereof

Abstract

The invention relates to a multi-inner-core pressure forming steel pipe concrete laminated component which comprises at least two pressure forming steel pipe concrete core columns, stirrups and peripheral concrete. The pressure forming steel pipe concrete core column comprises a steel pipe, pressure forming concrete poured in the steel pipe and a fiber composite material wrapping the steel pipe, and the pressure forming concrete applies pressure to the concrete in the concrete curing process. The stirrups are bound on the peripheries of the at least two pressure forming concrete filled steel tube core columns; and the peripheral concrete is poured outside the bound pressure forming concrete filled steel tube core column to wrap the bound pressure forming concrete filled steel tube core column. The multi-inner-core pressure forming concrete filled steel tube composite member is high in bearing capacity, good in forming quality, good in fire resistance and low in construction difficulty.

Description

technical field [0001] The invention belongs to the technical field of concrete-filled steel tubes, and in particular relates to a multi-core pressure-formed concrete-filled steel tube composite member and a manufacturing method thereof. Background technique [0002] Concrete-filled steel tubes make full use of the respective advantages of steel and concrete materials, and have the characteristics of high bearing capacity, good plasticity and toughness, and convenient production and construction. They are widely used in industrial plants, high-rise, large-span buildings, bridges and underground structures. [0003] Due to the shrinkage of concrete during the curing process of existing CFST members, voids often appear at the steel tube-concrete interface, which affects the mechanical properties of CFST members. At the same time, as a concealed project that is not easy to detect, there are great security risks. In addition, due to the existence of the steel shell of the CFST ...

AI Technical Summary

Problems solved by technology

However, this structure still has the following disadvantages: 1) FRP pipes have poor fire resistance and are easily damaged when placed outside the component, which affects the overall performance of the component; 2) FRP tubes must be broken at the node where the laminated component meets other components Open to facilitate the passage of steel bars, thereby weakening the mechanical properties of the node position, which does not conform to the design concept of strong nodes and weak components

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