Seismic Performance Of Twenty Storeys Concrete Filled Square Steel Tubular Frame-Steel Shear Wall System

In general, the Equivalent Lateral Force (ELF) method is used in seismic design of structure. The Response Modification Coefficient (RMC) is applied to reduce the seismic load based on elastic response spectra. The value of RMC relfects the energy dissipation ablility and ductility of structures. The value of RMC will rise with the increasing of energy dissipation ability and ductility of a structure. A proper RMC value is a key to the safety and economy of seismic design.Steel plate shear walls (SPSW) and composite steel plate shear walls (CSPSW) have the advantages of high stiffness, high load-carrying capacity, good ductility and etc. al. Also, the connections between SPSW (CSPSW) and steel frame are convinent. Comparing with reinforced concrete (RC) shear walls, SPSW or CSPSW with the same shear capacity, and most likely larger shear stiffness, will have smaller thickness, less weight and higher energy dissipation ability. Those two kinds of shear walls can be an attractive option for lateral resisting system in buildings. The composite frames with concrete-filled square hollow section steel columns also possess remarkable ductility and energy dissipation ability. The paper presents the seismic behavior of 20-storey composite frame combined with SPSW or CSPSW. The main works are as follows:(1) A 20 stories composite frame-SPSW (CSPSW) structure is designed. The reasonable dimensions of frame columns connected with shear walls are very important. The frame columns should be stiff enough to fully develop the shear force of SPSW or CSPSW. The experimental results are used to evaluated the accuracy of element types, stress-strain relationships of steel and concrete, and simplified models.(2) The seismic performace of composite frame-SPSW structure is analyzed by using nonlinear static pushover analysis method. The plastic development of frame members and SPSW, the distribution of storey drift and storey shear bertween the composite frame and SPSW are studied. The RMC and deflection amplification factor (DAF) are obatained based on the dynamic analysis of 44 different earthquake records.(3) The dynamic analysis of composite frame-CSPSW structure is doned under 44 diffirent earthquake records. The values of RMC and DAF for this kind of composite structure are proposed. Meanwhile, the influence of different shear walls, including SPSW and CSPSW, on the static and dynamic response of structures is analyzed.