Seismic performance and damage assessment of CFDST frames with SBYC damper

Abstract

Nowadays, the dual system consisting of moment resisting frame with energy dissipation devices was suitable to be employed for high-rise buildings in the area with high seismic intensities. Current investigations merely concentrated on the story drift as the main index to evaluate the seismic performance of such kind of system, which could not reveal the component damage state in a structure. It is more comprehensive to evaluate the seismic performance through the damage state of components. In this paper, the seismic damage of components in the dual system consisting of concrete filled double skin steel tubular (CFDST) moment resisting frame with shear -bending yielding coupling (SBYC) damper was analyzed. The damage factors of different components including CFDST column, semi-rigid joint and SBYC damper were determined based on existing test results. The nonlinear model of the dual system was established by Opensees and verified by the test results. Afterwards, the 20- and 10-story dual structures were designed with different strength of SBYC damper and moment resistances of joint. Parametric analyses were conducted on these two dual systems through the endurance time method. Further, the uniform damage ratio was defined to represent the uniform level of the damage distribution of the components. It found that increasing the strength of joint was beneficial for achieving a uniform damage distribution of SBYC damper, joint and SBYC damper. The analytical results were beneficial for the application of dual system and provided a reasonable method to evaluate the seismic performance and damage of dual systems.