薄膜充气拱褶皱特性分析

Wrinkling characteristics analysis of inflated membrane arch

摘要:

为掌握薄膜充气结构褶皱发生及拓展演化规律,通过数值模拟和实验相结合的方法研究了薄膜充气拱的皱曲问题．据此分析了充气压力、材料厚度、结构尺寸和载荷工况4个参数对薄膜充气拱褶皱特性的影响．在此预报了薄膜充气拱在不同载荷工况下的初始起皱力、初始起皱位置、褶皱扩展演化规律及承载力并开展了薄膜充气拱的皱曲实验,验证了文中的有限元模拟结果．研究结果表明:结构尺寸对薄膜充气拱的褶皱特性影响最大,充气压力次之,材料厚度影响最小;在5种载荷工况中,Fx拉最安全,Fz面外最危险,其他3种载荷介于二者之间．

Abstract:

Wrinkling characteristics of inflated membrane arch are studied in this paper using numerical and experimental methods to obtain the rules of winkling formation and evolution. The influences of pressure, thickness, structural size and loading cases on the winkling characteristics of inflated membrane arch are analyzed in detail. The wrinkling forces, wrinkling locations, wrinkling evolutions and load-carrying ability of the inflated membrane arch subject to different loading cases are then predicted. The experimental tests verify the accuracy of the numerical results in the end. The results show that the structural size is the most important factor to winkling characteristic of inflated membrane arch, the inflated pressure is the second important factor, and the thickness is the less important factor. In five loading cases, Fx is the safest one, Fz is the most dangerous one, anther three loading cases are just between the two loading cases above.