Analyses of seismic fragilities of single-layer cylindrical reticulated shells #br#
under near-fault and far-field ground motions
Zhong Jie1,2 Zhi Xudong3 Fan Feng3 Dai Kaoshan1,2
1. Key Laboratory of Deep Underground Science and Engineering of the Ministry of Education, Sichuan University, Chengdu 610065, China;
2. College of Architecture & Environment, Sichuan University, Chengdu 610065, China; 3. Harbin Institute of Technology, Harbin 150090, China
Abstract：Different from the far-field ground motions, the near-fault pulse-like ground motions have the characteristics of high transient input energy and long pulse periods, however, very few researchers have currently focused on their effects on the reticulated shells. In this paper, the incremental dynamic analyses are performed on nine three-way grid single-layer cylindrical reticulated shells, subjected to a set of 40 near-fault pulse-like ground motions and the other set of 40 far-field ground motions, respectively. The probabilistic seismic demand models and capacity models are developed using the incremental dynamic analysis results, and then the fragility curves are obtained. Finally, the comparison analyses on these results due to the two sets of ground motions are made. It can be concluded that, when compared to the far-field ground motions, the near-fault pulse-like ground motions will lead severer damages to the single-layer cylindrical reticulated shells and bigger dispersion of the damage index; besides, the probabilities of failure to the limit states of this type of reticulated shells under nearfault pulse-like ground motions are also higher than that under far-field ground motions.
