拱形气肋充气阶段力学性能分析与试验

Experiment and analysis of the mechanical performance of air-inflated arch during inflating stage

首先从理论方面对气肋在充气阶段的应力进行了分析,找出简单易行的计算方法,列出应力表达式和气肋外边、中线、内侧的膜张力公式.然后分别利用有限元软件ANSYS和索膜结构设计分析软件Easy对半圆形气肋充气后气肋应力及拱顶位移进行了分析计算.制作了一个跨度12m、气肋直径0.6m的模型,进行了充气试验,并将拱顶位移计算值与试验值进行了对比.结果表明,充气后膜材应力理论值与两种软件计算值差别不大,最大误差为9.8%,拱顶高度两种软件计算结果与试验结果差别较小,最大误差为1.7%,理论计算与试验值吻合较好.

The theoretic formulae and stress were proposed for the air-inflated arch in course of inflating, including stress expression, and the membrane tension formula of gas ribbed outside, the center line, the inside. Then large FEM software ANSYS and specialized lightweight structure analysis software, Easy system, were used for the calculation of air-inflated arch. The stress and top deflection were compared respectively for half circle arch during inflating phase. A 12.0m span and 0. 6m diameter of air-inflated arch was made. The inflation formation was carried and the deflection （height） was surveyed. Inflatable membranes stress after the theoretical value calculated with the two kinds of software was not very different with the largest error of 9.8 percent. The difference of the high dome between two software calculations and the experimental results was small, and the largest error is 1.7%5. The analytical results are close to the experiments.