Abstract
In order to study the axial compression performance of the T-shaped multi-cavity concrete-filled steel tube shear wall, first, three specimens were designed to perform the axial compression test. Then three-dimensional finite element analysis by the ABAQUS software was used to obtain the axial bearing capacity of the shear wall with different parameters. According to the results of the finite element model, the computational diagram in the limit state was obtained. The diagram was simplified into the core concrete in the non-enhanced area that was not constrained by the steel tube and the core concrete in the enhanced area that was uniformly constrained by the steel tube. Finally, a new practical equation for calculating the axial bearing capacity of a multi-cavity concrete-filled steel tubular shear wall was deduced and proposed based on the theory of ultimate equilibrium. The calculation results of the proposed equation were in good agreement with the finite element results, and the proposed equation can be used in practical engineering design.
Highlights
In the development of high-rise buildings and super high-rise buildings, structures with better performance are needed to improve the bearing capacity of buildings [1]
To overcome the shortcomings of the traditional special-shaped concrete-filled concrete column, this paper proposes a new type of combined square steel tube concrete composite shaped shear wall and T-shaped concrete-filled steel tube shear wall (CFSTSW) to improve the bearing capacity and meet the requirements of fast construction speed
In actual production, the production, processing, transportation, installation, and other processes of the steel plate will cause the initial geometric defects on the surface of the steel plate and cannot maintain the ideal state. To consider this defect in ABAQUS, the local buckling of the steel plate usually adds the initial defects to the finite element model, that is, performs eigenvalue buckling analysis of the specimen before the model calculation to obtain the first-order buckling mode of the specimen, and applies the initial defect to the related node according to a certain proportion of the buckling mode of the model
Summary
In the development of high-rise buildings and super high-rise buildings, structures with better performance are needed to improve the bearing capacity of buildings [1]. Han [2] and Ding [3] carried out an experimental study on the axial compression performance of circular concrete-filled steel tube short columns. Portoles [4] and Liu [5] conducted an experimental study on the bending performance of circular concrete-filled steel tube short columns. Based on the elastic buckling theory of steel plate, Fu [22] proposed a technical measure and design method of setting a T-shaped stiffener in a rectangular concrete-filled steel tube column with large plate width and thickness, and a T-shaped stiffener was arranged along the steel tube wall lengthwise. Yang [24] conducted an experimental study on the surface of the tube welded with bars to improve the axial compression performance of the T-shaped CFST (concrete-filled-steel tube) column. The results calculated by the proposed equation are in good agreement with those calculated by the finite element method and can be used in the actual engineering design
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