Abstract: In this paper dynamic analysis and a seismic analysis of offshore structures are studiedwith response spectrum theory.After having considered the fuzziness of intensity and thefuzziness of site soil classification,the authors utilize fuzzy random process to simulate earth-quake ground movement and give the eorresponding formulas.The linearization of equal effects for non-linear fluid resistance is also studied and the formulas for non-fuzzy earthquakeresponse are obtained.The fuzzy earthquake response of offshore structure is further consid-ered on the above work.In order to discuss the theory and methods,a simple example is cal-culated and the results are analyzed.

Key words: offahore platform, offshore, structuLrc an<3lvses, fuzzy diagnosis, seismic response

摘要： 用响应谱理论研究了离岸结构的动力分析与地震分析.考虑了烈度的模糊性和场地土分类的模糊性,利用模糊随机过程模拟地震地面运动并给出了相应的计算公式.文中还对非线性流体阻力进行了等效线性化,得到非模糊地震响应的公式,在此基础上进一步考虑了离岸结构的模糊地震响应.并用算例进行了结果分析.

关键词: 海洋平台, 离岸, 结构分析, 模糊识别, 地震响应