The discussion on some problems in seismic design code of offshore platform in China
我国海洋平台抗震标准若干问题探讨

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.