直立腿海洋平台冰激振动响应参数敏感性分析

Sensitivity analysis of ice-induced vibration response parameters of the vertical leg offshore platform

为研究直立腿海洋平台冰激振动响应对海冰参数的敏感性,考虑海冰参数值的发生概率,设计三因素-五水平正交模拟方案.根据冰荷载功率谱密度函数,采用简谐波叠加法生成冰荷载时程数据,使用SACS软件建模,计算结构动力响应,并进行极差分析、方差分析和相关性分析.研究结果表明:直立腿海洋平台冰激振动响应对海冰漂流速度的敏感性可忽略不计,对海冰强度和冰排厚度的敏感性较高,并且对海冰强度的敏感性要低于对冰排厚度的敏感性;冰厚对最大基底剪力影响最大,对最大倾覆力矩影响最小;强度对最大倾覆力矩影响最大,对顶层加速度影响最小.研究结论可为冰区海洋平台的设计提供一定的参考.

In order to study the sensitivity of the ice-induced vibration response of vertical leg offshore platform to sea ice parameters,by considering the occurrence probability of sea ice parameter values,a three-factor-five-level orthogonal simulation scheme was designed.According to the ice load power spectrum density function,the simple harmonic superposition method was used to generate the ice load time history data,and the SACS software was used to build the model to calculate the structural dynamic response,and carry out range analysis,variance analysis and correlation analysis.The results show that the sensitivity of ice-induced vibration response to sea ice drift velocity is negligible,and the sensitivity to sea ice strength and ice sheet thickness is higher;and the sensitivity to sea ice strength is lower than the sensitivity to ice sheet thickness.The influence of ice thickness on the maximum base shear force is maximum,and the influence on the maximum overturning moment is minimum;the influence of strength on the maximum overturning moment is maximum,and the influence on the acceleration of the top layer is minimum.The results can provide some reference for the design of offshore platform in ice area.