LIMIT STATE DETERMINATION FOR A SUBWAY STATION STRUCTURE BY INCREMENTAL DYNAMIC ANALYSIS1) |
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| Authors: | LIU Tong YUAN Yong |
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| Affiliation: | Department of Geotechnical Engineering, Tongji University, Shanghai 200092, China;State Laboratory of Disaster Reduction of Civil Engineering, Tongji University, Shanghai 200092, China; |
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| Abstract: | The seismic performance of the underground structures, is not well studied, while on the other hand, the seismic limit state determination is important for a performance-based design. In this paper, four limit states are defined in terms of the deformation and the waterproof performance of the structure while the maximum story drift angle (θmax) is selected as the characteristic indicator according to the feature of the subway station. Based on a multi-story subway station in Shanghai, a two-dimensional finite element model of the soil and the structure is established and the seismic limit state of the subway station is investigated using the incremental dynamic analysis (IDA). Finally, the relation curve between the seismic intensity measure PBA (peak acceleration at the base of subway station) and structural performance indictor θmax is established and the thresholds of θmax for this subway station are obtained in the four limit states. |
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| Keywords: | subway station|performance-based design|limit state|incremental dynamic analysis|performance indicator |
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