Analysis On Performance Of CFST Frame-SPSW Core Wall Structure

A large number of high-rise buildings adopt CFST frame-core wall structure. Shear wall is the efficient lateral force resisting system in these structrures. Combine the SPSW and CFST frame-core wall structure to the CFST frame-SPSW core wall structure. In order to study the performance of this system, finite element models were constructed to investigate.CFST frame-SPSW core wall structure is a new type of structural system for super high-rise buildings. In this paper, unstiffened thin steel plate shear wall was designed according to AISC 341-10. Calculating models were constructed using software ETABS. Periods, displacements, stiffness ratios and internal forces were analyzed, as well as the influence of outriggers and belt trusses on structural behavior. The results show that most of the vertical load is supported by frame columns and vertical boundary elements, while steel plate subject to shear force. Setting up outriggers and belt trusses can improve the stiffness of structure, but also induce mutation of stiffness ratios and internal forces. Different kinds of stiffness cann`t change the structure performance a lot, but affect the internal force a lot.The ABAQUS models was constructed to analyze the influence of coupling beams, thickness of steel plate, number of stories and span to stiffness, bearing capacity, ductility ratio and failure mechanisms. Finally, the seismic performances of structure were evaluated based on the Capacity Spectrum Method(CSM). The results showed that the structures with coupling beams will be reduced rigidity. Increasing the thickness and apan of SPSW can increase the rigidity, while it can increase the bearing capacity, but ductility would be reduced.Elastic time-history analysis and elasto-plastic time-history analysis were carried out on CFST frame-SPSW core wall structures by ABAQUS, investigating the structure failure mechanisms and displacement.