Abstract：The connecting parts between the large span corridor and the main structure are easily to suffer damage under earthquake. To solve this problem, a structure connected with large span special-shaped steel corridor was analyzed and its seismic vulnerability laws with and without base-isolation structures were compared. Firstly, the base isolation design for the original connected structure was carried out, and the numerical models of isolated and non-isolated connected structures were established using SAP2000, respectively. Secondly, the damage indexes for the frame-shear wall structure, corridor’s rubber bearing, embedded parts and base-isolation bearing were defined, respectively. The incremental dynamic analysis was carried out under three-dimensional seismic excitation with 24 ground motion records as input data. Finally, the comparative analysis of seismic fragility between local and overall structure with and without base isolators was carried out. The results show that under the rare intensity level of degree 8, the failure probability of the base-isolation connected structure is lower than the non-isolation connected structure. The failure probability for corridor’s embedded parts are decreased by 46.19%, and the upper and lower bound of the failure probability for the overall structure are decreased by 72.56% and 82.62%, respectively. It is proven that the base isolation can significantly decrease the damage probability and improve the seismic performance of the connected structure. The most vulnerable local structures of the base-isolation connected structure are in turn base-isolation rubber bearing, the embedded parts，the main building，the affiliated building I and the rubber bearing of corridor. The similar damage sequence can be seen in the non-isolation connected structure. Therefore, it is suggested to use the base-isolation rubber bearing with high shear strain, and strengthen the connection measures of embedded parts of corridor in the base isolation design of the connected structure.
潘毅 包韵雷 刘永鑫 胡思远. 基础隔震大跨异形钢连廊连体结构地震易损性分析[J]. 土木工程学报, 2021, 54(2): 20-29.
Pan Yi Bao Yunlei Liu Yongxin Hu Siyuan. Seismic fragility analysis of base-isolation structure connected #br#
with large span special-shaped steel corridor. 土木工程学报, 2021, 54(2): 20-29.
