斜拉-悬索组合桥结构参数对自振特性的影响分析

Analysis on Influence of Structure Parameters of Cable-stayed and Suspension Composite Bridge on Self-vibration Characteristics

该文以甘肃省文县伐子坝桥为工程背景,引入只受拉三维拉索单元,采用考虑几何非线性的子空间迭代法进行了模态分析,给出了斜拉-悬索组合桥自振特性的分析结果,并重点讨论了垂跨比、恒载集度、加劲梁刚度、主缆和斜拉索刚度等结构参数变化对该桥自振特性的影响,为斜拉-悬索组合桥结构设计理论提供了动力性能方面的参考。

Taking Faziba Bridge in Wen County,Gansu Province as the engineering background,the article uses the geometrical nonlinearity of the subspace iteration method to carry out the mode analysis by introducing in 3-D tension cable unit only.The article gives the analysis result of the self-vibration characteristic of cable-stayed and suspension composite bridge,and focuses discussion on the influence of the structural parameter variety of ratio of rise to span,the dead load intensity, the stiffening girder rigidity,main cable and cable-stayed cable rigidities on the self-vibration characteristic of the bridge.It will provide the reference for the dynamic characteristics in the structural design theory of the cable-stayed and suspension composite bridge.