In this research, one of the procedures proposed in literature for the design of viscous dampers is extended to 3D plan-asymmetric buildings considering different distributions of the damping coefficients. In particular, simple distribution criteria, based on specific structural or response parameters, were considered with the purpose to improve the design of the damping system in terms of cost without significant change of response. All the distributions were applied considering, for comparison, both a simplified and an extended method, by neglecting or considering, respectively, the plan-asymmetry in the design. The effectiveness of the different distributions was examined by performing time-history analyses of a case study with different configurations of dampers adopting a nonlinear behaviour both for the viscous dampers and the frame members. The dampers were dimensioned considering that the structure can exceed the elastic limit, with the only condition to satisfy the prefixed performance limit. The considered case study is a RC frames characterized by six storeys and an irregular plan configuration. The examined response parameters were maximum interstorey drifts, residual interstorey drifts and peak floor accelerations as well as maximum damper forces.
Influence of the in-plan distribution of the properties of dampers for the seismic retrofit of RC plan-asymmetric frames
LANDI, LUCA
;MOLARI, ANDREA;DIOTALLEVI, PIER PAOLO
2017
Abstract
In this research, one of the procedures proposed in literature for the design of viscous dampers is extended to 3D plan-asymmetric buildings considering different distributions of the damping coefficients. In particular, simple distribution criteria, based on specific structural or response parameters, were considered with the purpose to improve the design of the damping system in terms of cost without significant change of response. All the distributions were applied considering, for comparison, both a simplified and an extended method, by neglecting or considering, respectively, the plan-asymmetry in the design. The effectiveness of the different distributions was examined by performing time-history analyses of a case study with different configurations of dampers adopting a nonlinear behaviour both for the viscous dampers and the frame members. The dampers were dimensioned considering that the structure can exceed the elastic limit, with the only condition to satisfy the prefixed performance limit. The considered case study is a RC frames characterized by six storeys and an irregular plan configuration. The examined response parameters were maximum interstorey drifts, residual interstorey drifts and peak floor accelerations as well as maximum damper forces.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
