The implementation of linear and nonlinear viscous dampers improves the seismic performance of a structure. The velocity coefficient which governs the hysteretic behavior of nonlinear viscous dampers modifies the seismic response and consequently the seismic performance of the structure. A six-story steel moment-resisting frame building was selected as an archetype structure to investigate the effect of nonlinear viscous dampers on its seismic performance. This building, incorporating brittle beam-column connections common in the pre-Northridge earthquake designs, was retrofitted with different configurations of viscous dampers to improve its seismic performance. Linear and nonlinear viscous dampers were designed by following two different design approach: 1) a uniform distribution design approach in which similar dampers are introduced at every level of the structure and 2) an equivalent lateral stiffness distribution design approach for which proportional damping is preserved. An incremental dynamic analysis was carried out with the FEMA P695 far-field ground motion set. The seismic performance of the archetype building was evaluated in terms of collapse capacity, median peak inter-story drifts, and median peak damper forces. The results showed a considerable improvement of the seismic performance with the implementation of fluid viscous dampers. However, the design approach and the velocity coefficient modified the seismic response, affecting the seismic demand on the structure.
Seismic performance of steel moment-resisting frame retrofitted with linear and nonlinear viscous dampers
Daniele Perrone
2019-01-01
Abstract
The implementation of linear and nonlinear viscous dampers improves the seismic performance of a structure. The velocity coefficient which governs the hysteretic behavior of nonlinear viscous dampers modifies the seismic response and consequently the seismic performance of the structure. A six-story steel moment-resisting frame building was selected as an archetype structure to investigate the effect of nonlinear viscous dampers on its seismic performance. This building, incorporating brittle beam-column connections common in the pre-Northridge earthquake designs, was retrofitted with different configurations of viscous dampers to improve its seismic performance. Linear and nonlinear viscous dampers were designed by following two different design approach: 1) a uniform distribution design approach in which similar dampers are introduced at every level of the structure and 2) an equivalent lateral stiffness distribution design approach for which proportional damping is preserved. An incremental dynamic analysis was carried out with the FEMA P695 far-field ground motion set. The seismic performance of the archetype building was evaluated in terms of collapse capacity, median peak inter-story drifts, and median peak damper forces. The results showed a considerable improvement of the seismic performance with the implementation of fluid viscous dampers. However, the design approach and the velocity coefficient modified the seismic response, affecting the seismic demand on the structure.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
