基于流体腔方法的海上充气膜结构抗弯承载性能研究

Investigation on Bending Behavior of Inflated Membrane Structure Based on Fluid Cavity Method

应用基于表面定义的流体腔方法建立充气膜结构抗弯承载性能数值分析模型,并将其与模型试验对比,验证了数值方法的可靠性。通过数值仿真和模型试验分析了充气膜结构的变形和失效模式,讨论了内压对其承载性能的影响。研究表明,充气膜结构的承载性能与内压线性正相关,且随着局部褶皱现象出现,承载性能快速下降;变形和应力分布与传统的4点弯曲梁相似,而失效模式则为褶皱诱发的局部失稳。论文建立的数值方法对浮式充气膜结构在海洋工程中的应用具有较好的的工程指导意义。

Surface-based fluid cavity modelling is employed to set up a finite element model for analyzing bend behavior of inflated membrane structures,and reliability of the model is verified by comparison with the experiment.Deformation behavior and failure mode of inflated membrane structures are analyzed,and influence of internal pressure on the bearing capacity is discussed by FEM and experiment.The results are as follows:bearing capacity of the inflated membrane structure is positively linearly correlated with the internal pressure but decreased obviously with the occurrence and propagation of wrinkles.The deformation behavior and stress distribution are similar to that of traditional four-point bending beam,and local instability induced by wrinkles may cause structural failure.This finite element model has engineering guiding significance for the application of floating inflatable membrane structures in ocean engineering.