This paper deals with the parameters which influence the probability of reaching the near collapse limit state of RC frame structures equipped with nonlinear fluid viscous dampers. The study can be divided into two steps. The first, aims to assess how the median and the dispersion of seismic demand can vary in the RC frame structures equipped with nonlinear fluid viscous dampers, considering a wide set of ground motions; these parameters have been compared with those obtained for RC structures without dampers. The second step evaluates the expression in closed form, given in the 2000 SAC/FEMA method to assess the annual probability of failure of RC structures. This calculation has been performed using the parameters obtained in the previous step. The annual probability of failure has been estimated in the RC frame structures, with and without dampers, considering a wide set of ground motions and different methods to approximate the hazard curve. The adopted case study is a frame configuration characterized by three bays and six floors. The analyses have allowed to evaluate the variability and the influence of the terms in the expression proposed in the 2000 SAC/FEMA method, as the dispersion of seismic demand.
Evaluation of dispersion of seismic demand in the probabilistic assessment of RC frames equipped with viscous dampers
LANDI, LUCA;DIOTALLEVI, PIER PAOLO
2015
Abstract
This paper deals with the parameters which influence the probability of reaching the near collapse limit state of RC frame structures equipped with nonlinear fluid viscous dampers. The study can be divided into two steps. The first, aims to assess how the median and the dispersion of seismic demand can vary in the RC frame structures equipped with nonlinear fluid viscous dampers, considering a wide set of ground motions; these parameters have been compared with those obtained for RC structures without dampers. The second step evaluates the expression in closed form, given in the 2000 SAC/FEMA method to assess the annual probability of failure of RC structures. This calculation has been performed using the parameters obtained in the previous step. The annual probability of failure has been estimated in the RC frame structures, with and without dampers, considering a wide set of ground motions and different methods to approximate the hazard curve. The adopted case study is a frame configuration characterized by three bays and six floors. The analyses have allowed to evaluate the variability and the influence of the terms in the expression proposed in the 2000 SAC/FEMA method, as the dispersion of seismic demand.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
