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To study the seismic performance of a long span airship shed with high supporting, modal analysis was carried out at first, then the mode-superposition response spectrum analysis and elastic time history analysis were carried out to calculate the response of the structure under frequent earthquake. To calculate the response under rare earthquake, the dynamic elasto-plastic time-history analysis was done considering the material and geometric nonlinearity. Because the structural length is close to 300m, multi-support excitation analysis were carried out to study the influence of the traveling wave effect. Through the analysis, some valuable conclusions were obtained. The former six modal shapes were all horizontal with torsional effect at the same time, and the vertical modal shape appeared until mode 7. The structural biggest displacement and the basis shear force under frequent earthquake satisfied the code requirement. The earthquake response of the roof structure under horizontal earthquake is higher than that under vertical earthquake. Under the rare earthquake, the maximum top drift angle of the supporting columns is much less than the limit value and there appear only a few plastic hinges in the whole structure. In the roof structure, most plastic hinges appeared on the web members close to the mid-span. In the supporting columns, most plastic hinges appeared on the column tops at the two sides of the door. The earthquake response of the roof structure and the columns under multi-support excitations are higher than that under uniform excitation.
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