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膜结构是一种柔性结构,膜面容易发生雨水积留。针对ETFE(四氟乙烯)薄膜结构,利用ANSYS软件通过迭代计算分析了正方形平面膜面和正方形气枕膜面的积水极限承载力,考察不同跨度及矢跨比时的积水进展情况。计算结果显示,厚度为250μm的单层正方形平面膜面,跨度3m时就会发生积水破坏。对于气枕膜面,是否发生积水破坏由跨度与矢跨比决定。由两层厚度为250μm的ETFE薄膜叠合的正方形边界气枕膜面,当跨度达到5m时将发生积水破坏,跨度为4m、矢跨比达到1/8及以上时也将发生积水破坏。设计制作了3种矢跨比的ETFE薄膜气枕膜面,进行了积水承载试验,将试验结果与数值分析结果进行了对比。
Membrane structure is a flexible structure, the membrane surface prone to rain accumulation. Aiming at the structure of ETFE (tetrafluoroethylene) thin film, the water carrying capacity of square planar membrane and square air pillow membrane surface was analyzed by ANSYS software iteratively. The progress of water accumulation under different span and aspect ratio was investigated. The calculated results show that the single-layer square planar membrane with a thickness of 250μm will have water damage when the span is 3m. Pneumocapns membrane surface, whether the occurrence of water damage by span and sag ratio decision. Porous membrane of the square border of two layers of ETFE film with a thickness of 250μm will cause water damage when the span reaches 5m with a span of 4m. Water damage will also occur when the sag ratio reaches 1/8 and above . Three types of ETFE film air pillow membranes were designed and manufactured, and the water bearing test was carried out. The test results were compared with the numerical results.