【摘要】 基于线性颤振分析理论 ,考虑结构的动力特性和作用在结构上的气动力随风速以及结构变形的非线性变化因素 ,提出了大跨度桥梁的三维非线性颤振分析方法。运用该方法对具有流线型和钝体主梁断面的大跨度桥梁进行了各项非线性颤振分析 ,揭示了不同主梁断面形状大跨度桥梁颤振形态的内在本质和区别以及颤振发生的机理更多还原

【Abstract】 Based on the linear theory of flutter analysis,considering the nonlinear behavior of structural dynamic characteristics and aerodynamic forces which change with wind speed and structural deformation,an approach of three dimensional nonlinear flutter analysis for long span bridges is described herein.By using this method,nonlinear flutter analysis for long span bridges with streamlined and bluff main girder sections are performed.The essences and differences of flutter behaviors for long span bridges with different main girder sections are investigated,the flutter mechanism is also revealed.更多还原