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随着桥梁跨径的增大 ,各种非线性因素对大跨径悬索桥颤振特性的影响将不容忽视。在线性颤振分析方法的基础上 ,考虑风速的空间非均匀分布、结构以及作用于结构上的气动力随结构变形的非线性变化影响因素 ,建立了大跨径桥梁的三维非线性颤振分析方法。以某悬索桥为例 ,进行了考虑风速空间非均匀分布、结构动力特性以及气动力随结构变形的非线性变化等因素的颤振分析 ,揭示了各种非线性因素对大跨径悬索桥颤振影响的机理和规律
With the increase of bridge span, the influences of various nonlinear factors on the flutter characteristics of long-span suspension bridges should not be neglected. Based on the method of linear flutter analysis, three-dimensional nonlinear flutter analysis of long-span bridges is established considering the non-uniform spatial distribution of wind speed, the structure and the influencing factors of the nonlinear aerodynamic forces acting on the structure. method. Taking a suspension bridge as an example, the flutter analysis considering the non-uniform distribution of wind speed, the dynamic characteristics of the structure and the nonlinear variation of the aerodynamic forces with the deformation of the structure is carried out. The influences of various nonlinear factors on the flutter of long-span suspension bridges The mechanism and law