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在综合考虑结构几何非线性和静风荷载非线性的基础上提出一种大跨径桥梁空气静力稳定性的计算方法 ,并编制了相应的计算软件BNAP。然后分别对汕头海湾二桥 (斜拉桥 )和虎门大桥 (悬索桥 )的空气静力稳定性进行了计算。从计算结果中主梁跨中点处位移随风速的变化图入手 ,选取几个关键点 ,结合这几个关键点处结构的变形情况和对应的三分力系数变化情况 ,详细探讨了结构空气静力失稳机理
Based on synthetically considering the geometrical nonlinearity of structure and the nonlinear load of static wind load, a method to calculate the aerostatic stability of long-span bridges is proposed and the corresponding calculation software BNAP is compiled. Then the aerostatic stability of Shantou Bay Bridge (Cable-Stayed Bridge) and Humen Bridge (Suspension Bridge) were calculated respectively. Starting with the change of displacement along the mid-point of the main beam with wind speed in the calculation results, several key points are selected, and with the structural deformation and corresponding changes of the third-part force coefficient at these key points, the structure Aerostatic instability mechanism