Steady-state dynamic response analysis of self-centering structural systems with viscous damping

This paper presents steady-state dynamic response analysis of recently developed two types of self-centering structural systems with viscous damping. One of them has nonlinear elastic behavior in the primary structures, and the seismic energy is dissipated by added viscous damping. The other system has elasto-plastic hysteretic behavior in the primary structures, and the seismic energy is dissipated by both yielding of primary structure and added viscous damping. While the developed self-centering structural systems have advantages in reducing residual displacement and acceleration, it is anticipated that such self-centering systems may have large displacement demand due to the potentially limited energy dissipation. The results obtained in this paper show that the supplemental viscous damping of 10% and 20% is required to effectively control the displacement demand for self-centering systems whose primary structural system is nonlinear elastic and elasto-plastic behaviors, respectively. The effects of various parameters of the hysteretic response on the system's seismic peak displacement demand were also investigated.