超大型浮体模块水弹性响应和结构强度分析

摘要

The method of hydro-elasticity considering the fluid and structure interaction could calculate structural safety of floating structures effectively based on the rigid characteristics of very large floating structures (VLFS), which is used here to analyze the global wave loading and structural stress responses of single module of VLFS. In this paper, the natural mode and shape of vibration and intrinsic frequency are calculated by 3D FEM for single module. Then the harmonic frequency and principal coordinate responses of single module are obtained by mode superposition method and BEM method. Forwards, the structural stress responses of each mode and global stress responses are investigated; meanwhile the dangerous load-ing cases and the structural strength of single module are assessed. The results provide a certain guiding meanings for structural optimized design and safety assessment of VLFS.%水弹性方法针对超大型浮体的刚度特点，充分考虑了结构变形与流体运动的相互作用，是进行结构安全性分析的有效手段。文章采用水弹性分析方法研究了超大型浮体单模块总体波浪载荷以及结构应力响应。首先基于三维有限元方法分析了模块在真空中的总振动模态，然后结合模态叠加法和边界元法计算了模块在流场里面的谐振和模态响应。在此基础上，研究了各模态下结构的应力响应以及总应力响应，并分析了危险载荷工况，评估了超大型浮体单模块的结构强度，研究结果对超大型浮体单模块结构优化设计和安全性评估具有一定的指导意义。