针对大型海洋石油平台钻井架、吊机等高耸镂空结构抗风敏感性问题,进行了高耸结构风致振动响应分析。基于相似准则开展了0~360°全风向角下大型海洋石油平台高频动态测力天平实验,建立了平台结构全风向角下脉动风载荷空间分布估计模型,进行了全风向角下平台结构风致振动评估,获得了平台结构风致振动特性和阵风载荷因子变化规律。结果表明：平台结构横风向脉动风载荷均方根值约为顺风向脉动风载荷均方根值的10%;平台结构风致振动主要集中于井架等高耸镂空结构,横风向加速度均方根值约为顺风向加速度均方根值的55%;井架等高耸结构对横风向脉动风载荷动力放大作用较大。进行大型海洋石油平台结构抗风设计时不应忽略横风向风载荷作用,还要重点关注高耸井架顶部和底部的风振响应以及高耸结构对横风向脉动风载荷的放大作用。图12表3参18
In connection with wind sensitivity for the towering and hollowed-out structures (drilling derrick, crane, etc) of large offshore oil platform, the wind-induced response of towering structure was studied. By the similarity criteria, high frequency force balance tests for the large offshore oil platform under 0-360° wind directions were carried out, and the spatial distribution model of fluctuating wind load acting on platform was presented. Also, the characteristics of wind-induced vibration and the changing rule gust loading factors were obtained precisely through wind-induced assessment in all directions. The results show that: the RMS (Root Mean Square) of the fluctuating across-wind load is about 10% of the fluctuating along-wind load on the platform; the vibration is mainly focused on the towering and hollowed-out structure like derrick, and the RMS of the across-wind acceleration is about 55% of the along-wind acceleration; the towering derrick has a big dynamic magnification of fluctuating across-wind load. The across-wind load can not be neglected in wind resistance design of large offshore oil platform, also the wind-induced response on the top/bottom of derrick and the magnification of fluctuating across-wind load of towering structure should be mainly considered.
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