我国海洋平台抗震标准若干问题探讨
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摘要
我国尚未制定海洋平台的抗震标准.本文首先介绍了美国RP2A-WSD规范的内容,并与我国相关规范进行对比分析,认为我国目前采用的海洋平台强度设计和变形设计水准过于保守.从海洋平台的结构特征出发,探讨了海洋平台的工程地震问题.在此基础上,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,提出我国海洋平台用于强度设计的正常使用极限地震重现期取200年、用于延性设计的变形极限地震重现期取1000年.最后通过一个工程实例,分析了海底泥面对设计地震动参数的影响,以及不同抗震标准下设计地震动参数的差别,认为本文提出的平台抗震设防水准是安全合理的,同时又兼顾到我国经济承受能力以及与现行标准的连贯性.
There is still no specific seismic design code for offshore platforms in China.The current seismic design code commonly used in the world is RP2A-WSD compiled by American Petroleum Institute.A brief introduction of RP2A-WSD code is given in this paper,and the comparison between RP2A-WSD and related code in China suggests that the strength and deformation design levels in China are overestimated.The related engineering seismological issues in the offshore platform design are discussed in the view of structural characteristics.Summing up the factors,such as,seismic activity of China seas,the reference period of platforms,seismic fortification objective,and the seismic fortification experiences of related engineering,we recommend that the return periods of strength design and deformation design take 200 years and 1000 years relatively for offshore platforms in China.Then an example is presented to analyze the effect of seabed on design seismic parameters and the difference of design seismic design parameters with different probabilistic levels,and the result shows that the recommended design level is rational,and it is consistent with the economic state and the related codes.
There is still no specific seismic design code for offshore platforms in China.The current seismic design code commonly used in the world is RP2A-WSD compiled by American Petroleum Institute.A brief introduction of RP2A-WSD code is given in this paper,and the comparison between RP2A-WSD and related code in China suggests that the strength and deformation design levels in China are overestimated.The related engineering seismological issues in the offshore platform design are discussed in the view of structural characteristics.Summing up the factors,such as,seismic activity of China seas,the reference period of platforms,seismic fortification objective,and the seismic fortification experiences of related engineering,we recommend that the return periods of strength design and deformation design take 200 years and 1000 years relatively for offshore platforms in China.Then an example is presented to analyze the effect of seabed on design seismic parameters and the difference of design seismic design parameters with different probabilistic levels,and the result shows that the recommended design level is rational,and it is consistent with the economic state and the related codes.
引文
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