Torsionally coupled dynamic performance analysis of asymmetric offshore platforms subjected to wave and earthquake loadings
Torsionally coupled dynamic performance analysis of asymmetric offshore platforms subjected to wave and earthquake loadings作者机构：Zhejiang Provincial Planning Design & Research Institute of Communications Hangzhou 310006 China
出 版 物：《Earthquake Engineering and Engineering Vibration》 (地震工程与工程振动（英文刊）)
年 卷 期：2010年第9卷第2期
页 面：247-258页
核心收录：
学科分类：070801[理学-固体地球物理学] 07[理学] 0708[理学-地球物理学]
基 金：Program for Chang Kong Scholars and Innovative Research Team (No.IRT0518) National Natural Science Foundation of China Under Grant No.50708013
主 题：offshore platform asymmetric structure accidental eccentricity torsion coupling earthquake load wave load
摘 要：The dynamic equations of motion of asymmetric offshore platforms under three different environmental conditions:seismic action,wave action and their combination are established in this paper. In establishing these motion equations,three typical eccentricity types including mass eccentricity,rigidity eccentricity and their combination were considered,as are eccentricities that occur un-idirectionally and bi-directionally. The effects of the eccentricity type,the dynamic characteristics and the environmental conditions on the torsional coupling response of platforms are investigated and compared. An effort has also been made to analyze the inffluence of accidental eccentricity on asymmetric platforms with different eccentricity in two horizontally orthogonal directions. The results are given in terms of non-dimensional parameters,accounting for the uncoupled torsional to lateral frequency ratio. Numerical results reveal that the eccentricity type has a great inffluence on the torsionally coupled response under different environmental conditions. Therefore,it is necessary to consider the combination of earthquake and wave action in the seismic response analysis of some offshore platforms.
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