Seismic behaviour of novel concrete-filled composite plate shear walls with boundary columns

Abstract

Concrete-filled composite plate shear walls (CCPSW) with novel enhanced C-channels (CCPSW-ECs) were developed as lateral-shear resisting structural components in high-rise buildings and nuclear facilities. This paper studied seismic performances of CCPSW-ECs through eight cyclic tests. The key influencing parameters on seismic behaviours of CCPSW-ECs were studied in the testing program, i.e., spacing of ECs (S), axial force ratio (nd), thickness of steel tube (tb), width of boundary CFST (Wb), with/without additional strengthening steel tube in boundary column, and with/without boundary CFST column. The CCPSW-ECs failed in flexure with characteristics of yielding and local buckling of faceplates in the CCPSW and steel tube of boundary CFST column, and crushing of concrete core. Introducing strengthening steel tube, using boundary CFST column and enlarging the tb of boundary CFST column acted effectively on improving seismic resistances of CCPSW-ECs. Varying S and nd values exhibited marginal influences on seismic resistances of CCPSW-ECs. This paper developed theoretical hysteretic model to describe skeleton and cyclic load versus lateral displacement behaviours of CCPSW-ECs. Validations against eight test results showed that the developed theoretical model predicted well skeleton/hysteretic load-lateral displacement behaviours of CCPSW-ECs.