UHPC (ultrahighperformanceconcrete) box type steel tube concrete stiff skeleton column structure and construction method thereof

Abstract

The invention relates to a UHPC (ultrahighperformanceconcrete) box type steel tube concrete stiff skeleton column structure and a construction method thereof, which comprises four support columns of equal length.The support columns are connected throughrebar UHPC plates, so that a square structure with support columns located at four corners is formed;the support columns and the rebar UHPC platesare arranged in a full-length mode; the support columnsare composed ofsteel tube concrete columns and outer wrapping UHPC layerswrapping the steel tube concrete columns, each of the steel tube concrete columns comprises a steel tube and tube inner concrete arranged in the steel tube in a filling mode; the rebar UHPC plates comprise square UHPC plates located between two adjacent support columns, positioning blocks are arranged on the side, connected with the supporting columns, in the square UHPC plates, the positioning blocks of the two adjacent support columns are connected through reinforcing meshes, and fixedly connected rebars erected and distributed in a staggered mode form the inside of the reinforcing mesh,the UHPC boxtypesteel tube concrete stiff skeleton column structureisreasonable in structure, good in ductility, high in bearing capacity, high in rigidity, light in self-weight, and good in durability, and the occupied space of pier studs is effectively reduced.

Description

Technical field [0001] The invention relates to a UHPC box-type steel tube concrete rigid skeleton column structure and a construction method thereof. Background technique [0002] Ultra-high Performance Concrete (UHPC) is the most durable engineering material. The mechanical properties of UHPC with proper reinforcement are close to steel structure. At the same time, UHPC has excellent wear resistance and explosion resistance. After adding a certain amount of fine steel fiber, its ductility is significantly improved, and it can even reach 250 times the ductility of ordinary concrete, and the ultimate tensile strain can reach 1% of the ultimate compressive strain; UHPC is used in various engineering facilities. Wide application prospects, especially long-span bridges, explosion-resistant structures (military engineering, bank vaults, etc.) and thin-walled structures; UHPC is generally composed of cement, silica fume, fine sand, superplasticizer and steel fiber and other materials ...

AI Technical Summary

Problems solved by technology

If the cross-sectional area of ​​CFST in box-type CFST stiff-frame columns is not changed, but the cross-sectional area of ​​the outer reinforced concrete layer is increased to improve the bearing capacity, stiffness and durability of box-type CFST stiff-frame columns, it will increase The space occupied by the large piers is not conducive to the passage under the bridge, and also increases the difficulty of construction

However, in order to meet the superior performance of box-type concrete-filled steel tube rigid frame columns, the outer reinforced concrete layer is often designed to be thicker, resulting in the problem of excessive structural volume

[0005] At present, most of the concrete filled in box-type concrete-filled steel tube stiffened frame columns is ordinary concrete with heavy weight, low strength, weak stiffness, fragility, and general corrosion resistance. Application in large bridges; in the western region where the wind and sand environment is more serious, the outer reinforced concrete layer is also severely damaged, which is not conducive to the normal use of box-type concrete filled steel tube rigid frame columns

[0006] In addition, due to the poor self-compactness of the outer reinforced concrete layer in the box-type concrete-filled steel tube rigid frame column, when the structure is subjected to excessive load, the local crush damage of the outer reinforced concrete layer will be further increased, reducing the superior performance

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