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通过对中国、德国、日本、美国、欧洲索膜设计标准中膜材安全系数的研究、比较和探讨,综合考虑膜材接缝和连接的方式、荷载方式、长期荷载、双轴强度、污染和老化、高温影响、撕裂强度等因素对膜材安全系数的影响,同时结合世博轴索膜顶棚跨度大、位移大、几何非线性强、膜材强度高等结构特点,确定了PTFE膜材及其接缝和连接合适的长期、短期荷载组合下的安全系数,保证结构的安全可靠.
Through the research, comparison and discussion on the safety factor of the membrane in the design standards of the cable design in China, Germany, Japan, the United States and Europe, the factors such as the way of the membrane joints and connections, the load method, long-term load, biaxial strength, Aging, high temperature, tear strength and other factors on the safety factor of the membrane, combined with the Expo Axis roof membrane span large, large displacement, strong geometric nonlinearity, membrane strength and structural characteristics to determine the PTFE membrane and its Seams and connections suitable long-term, short-term load combination of safety factor to ensure the structure of safe and reliable.