Self-piercing riveting(SPR)connections have superior mechanical properties and high connection efficiency,they are thus used in cold-formed thin-walled steel(CFTWS)shear wall to improve the stiffness,bearing capacity and low degree of industrialization of the wall.In this study,low-cycle reciprocating load tests were conducted for the three CFTWS shear walls with SPR and one CFTWS shear wall with screw connection.The failure mode,ductility,energy dissipation capacity,shear capacity and stiffness degradation of each specimen were obtained,and the effect of rivet spacing(50-150 mm)on the seismic performance of shear walls was studied.According to the damaged states of the shear wall and the performance design objectives,the limit values of the elastic and elastic-plastic story-drift angle were proposed.Based on the OpenSees finite element software,a nonlinear simplified analysis model of CFTWS shear wall with SPR and an efficient seismic performance analysis method of the whole structure were proposed.In addition,the incremental dynamic analysis of the entire structure was conducted based on the simplified model,and the seismic performance of CFTWS structures with SPR connections were evaluated.The results show that the main failure modes of the CFTWS shear walls with SPR include sheet buckling,failure of SPR,distortional buckling of end stud and track tearing,and the rivet spacing at the edge of the sheet is the key factor.Reducing the rivet spacing can effectively improve the shear capacity,stiffness,ductility,deformation and energy dissipation capacity of shear wall,and improve the sudden change of stiffness.Based on the results in this study,the limit value of the elastic and elastic-plastic story-drift angle can be suggested as 1/300 and 1/50,respectively.The nonlinear simplified analysis model can accurately predict the hysteretic properties of shear wall.The seismic performance of CFTWS structures with SPR connections meets the requirements of the code.
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