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本文对受随机波浪载荷的自升式平台结构非线性随机响应,在时域内作了动态分析。分析中考虑了平台桩腿与海底间的相互作用,用随机模拟的方法产生随机波浪外载荷,并考虑了Morison 力中的非线性,在时域内采用 FFT 法进行了动态响应计算。给出了自升式平台 Dyvi-Gama 在随机波浪载荷作用下的非线性随机响应的极值响应结果,并对所得极值作了若干随机分布分析,指出在所分析的结构响应中考虑非线性因素的情况下,几种分布中,唯有冈贝尔(Gumbel)分布较好地描述了其极值分布特征。
In this paper, the nonlinear random response of self-elevating platform subjected to random wave loads is analyzed dynamically in the time domain. In the analysis, the interaction between the platform legs and the sea floor is considered. Stochastic simulation is used to generate random wave loads. The nonlinearity in the Morison force is considered. The dynamic response is calculated by the FFT method in the time domain. The extreme nonlinear response of the self-elevating platform Dyvi-Gama under stochastic wave loads is given. Some stochastic distributions of the obtained extremums are given. It is pointed out that the non-linearity Among the several distributions, only the Gumbel distribution describes the distribution of extreme values well.