近场与远场地震动作用下单层柱面网壳结构易损性分析

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 near-fault pulse-like ground motions are also higher than that under far-field ground motions.