关于海洋平台抗震设防水准的考虑

Determination of Seismic Design Level of Offshore Platform in China

我国尚未制定海洋平台的抗震设计规范,本文首先将美国API-RP2A(2002)和GB17503-1998规范作分析对比,并结合美国南加利福尼亚地区和我国渤海海域地震活动性的情况,认为GBl7503-1998规范的抗震设防概率水准似乎过于保守。根据我国海域地震活动特征、海洋平台的设计基准期和设防目标等因素,参照相关行业工程抗震设防标准的经验,提出海洋平台用于强度设计的正常极限地震重现期取200年、用于延性设计的变形极限地震重现期取3000年,并与有关行业工程抗震设防标准进行了比较分析。

There is no seismic design code of offshore platform in China at present. Based on the comparison between American Petroleum institute RP2A-WSD and GB 17503-1998, with the consideration of the seismicity of southern California and Bohai sea, we found that GB17503-1998 is too conservative. According to the seismic characteristic, design reference period of offshore platform, seismic design goal and the seismic design experiences in relative areas, we recommend that the return periods for strength design and deform design for offshore platforms take 200 years and 3000 years respectively.