薄膜结构褶皱研究述评

薄膜结构的一个显著特点是膜材不具有弯曲刚度 ,不能承受面内压应力。当外荷载产生的压应力超过结构的预拉应力时 ,薄膜结构将产生局部屈曲 ,即褶皱。褶皱的出现会对膜结构的美观及受力性能造成影响 ,甚至会造成膜材破坏。由于薄膜结构褶皱机理的复杂性 ,该问题一直没有得到很好的解决。为此 ,笔者首先概括分析了国内外膜结构褶皱分析方面的主要成果 ,并提出采用修正的本构矩阵方法 ,来分析处于褶皱状态的薄膜结构 ,结合算例证明了该方法的正确性和有效性。

Review of Methods of Wrinkling Analysis of Membrane Structures

Thin membranes are inherently not compressive structures. When external actions give rise to compressive stress larger than the pre-stress, the membrane will wrinkle instead of developing compressive stress. The presence of wrinkles in membrane structures may significantly influence static and dynamic behavior of the structures even the destruction of membrane. It is therefore important to develop computationally effective analysis methods to predict the performance of wrinkled membranes. Methods for wrinkling analysis of membrane structures over the past years are reviewed; particularly, the method of modified constitutive relationship is proposed. The numerical example illustrates the accuracy and effectiveness of this method.