Frame joint of rectangular concrete-filled steel tube column employing knee-bracing stiffened steel plates

Abstract

The invention discloses a frame joint of a rectangular concrete-filled steel tube column employing knee-bracing stiffened steel plates. The frame joint comprises thin-walled rectangular steel tubes, cast-in-place concrete, I-steel beams and a knee-bracing steel plate stiffening rib.The knee-bracing stiffened steel plates are arranged in a joint core region and a plastic-hinge region for an end portion of a column steel tube. The stiffened steel plates and the inner wall of a steel tube are welded to three dividing points of a steel tube wall at 45-degree angles. The stiffened rectangular steel tubes and the I-steel beams are welded and are used for pouring concrete in order to form the frame joint of the rectangular concrete-filled steel tube column employing the knee-bracing stiffened steel plates.The frame joint of the rectangular concrete-filled steel tube column employing the knee-bracing stiffened steel plates has following beneficial effects: a novel joint form can effectively help delay local buckling of the steel tube, thereby improving constraint effect of concrete; tension of steel beam flanges can be effectively transferred by the knee-bracing steel plate stiffening rib and bending moment of the steel beams can be further effectively transferred such that the joint can satisfy the need of aseismic design; and the frame joint of the rectangular concrete-filled steel tube column employing the knee-bracing stiffened steel plates is novel framework node form featuring a fine mechanical property, convenient construction and economic feasibility.

Description

technical field [0001] The invention belongs to a building structure component, in particular to a frame node of a steel-concrete composite structure. Background technique [0002] Rectangular concrete-filled steel tube columns and their frame joints are new composite structural members with excellent seismic performance and quick and convenient construction, which is in line with the development trend of industrialization of building structures in my country at the present stage. The interaction between the steel pipe and the concrete in the rectangular steel tube concrete column is strong, and the material utilization efficiency is high. The steel pipes can be prefabricated in a factory and used as templates for concrete pouring on the construction site to speed up the construction progress; in case of fire, the internal concrete can absorb heat, delay the temperature rise of the steel pipes, and at the same time continue to bear the load after the bearing capacity of the ...

AI Technical Summary

Problems solved by technology

However, since the steel pipes in the core area of ​​the joint and at the end of the column are prone to local buckling, local buckling will reduce the interaction between the steel pipe and concrete, thereby reducing the overall bearing capacity and seismic performance of the member

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