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A preliminary study on seismic design criteria of offshore platforms in Bohai Sea of China |
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| Authors: | Yanju Peng Yuejun Lu Jiaquan Yan Rongyu Tang Junqin Wang Jiagang Li |
| Institution: | 1. Institute of Crustal Dynamics,China Earthquake Administration,Beijing 100085,China 2. Institute of Geophysics,China Earthquake Administration,Beijing 100081,China 3. Beijing Research Center of China National Offshore Oil Corp.,Beijing 100027,China |
| Abstract: | This paper analyzes the seismicity in Bohai Sea, introducing a shape factor K to characterize the seismic risk distribution in sub-regions of the sea. Based on the seismic design ground motions for 46 platforms located in the Bohai Sea, a statistical analysis was performed for different peak ground acceleration (PGA) ratios at two different probability levels. In accordance with the two-stage design method, a scheme of two seismic design levels is proposed, and two seismic design objectives are established respectively for the strength level earthquake and the ductility level earthquake. By analogy with and comparison to the Chinese seismic design code for buildings, it is proposed that the probability level for the strength level earthquake and ductility level earthquake have a return period of 200 and 1000–2500 years, respectively. The validity of these proposed values is discussed. Finally, the PGAs corresponding to these two probability levels are calculated for different sub-regions of the Bohai Sea. |
| Keywords: | fixed offshore platform seismic design level seismic design objective return period Bohai Sea |
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