Novel concrete filled steel tube stiffening mixed structure and construction method thereof

The invention provides a novel concrete filled steel tube stiffening mixed structure and a construction method thereof. The novel concrete filled steel tube stiffening mixed structure comprises inner-layer steel plate assemblies, round steel pipe chord members, profile steel web members and outer-layer steel plate assemblies, wherein the inner-layer steel plate assemblies are an inner-layer tubular structure formed by splicing a plurality of steel plates to form the stiffening mixed structure, the plurality of round steel pipe chord members are uniformly arranged on the periphery of the inner-layer steel plate assemblies along the extension direction of the tubular structure of the inner-layer steel plate assemblies, the profile steel web members are connected to two adjacent round steel pipe chord members to form a stiffening structure for the round steel pipe chord members, the outer-layer steel plate assemblies are laid on the outer sides of the round steel pipe chord members and the profile steel web members, and concrete is poured inside the round steel pipe chord members and between the inner-layer steel plate assemblies and the outer-layer steel plate assemblies. According to the novel concrete filled steel tube stiffening mixed structure and the construction method thereof, by reasonably arranging a combination form of the concrete filled steel tube structure, the contribution of the concrete filled steel tube to the flexural rigidity and flexural bearing capacity of the structure is exerted, and the reinforced concrete structure is wrapped around the concrete filled steel tube structure, so that a conventional steel tube structure is effectively prevented from being corroded by the environment, the novel concrete filled steel tube stiffening mixed structure and the construction method thereof have the advantages of high bearing capacity, good ductility, excellent anti-seismic property, good corrosion resistance and the like.