大跨径辐射式吊杆提篮拱桥参数敏感性研究

Study on Parameter Sensitivity of Long-span Radial Suspender Basket Arch Bridge

目的 研究大跨度辐射式吊杆提篮拱桥力学行为特点及控制策略,以主跨255 m无推力系杆拱桥为依托,探明不同设计参数对该体系拱桥结构响应的影响。方法 采用ABAQUS软件建立全桥有限元模型;采用均匀试验和多元回归分析方法,分析主梁重力密度、吊杆弹模、索力偏差、吊杆间距等结构参数变化对成桥阶段主要控制指标的影响及对结构响应的敏感程度。结果 成桥状态下,最敏感响应依次为主拱应力、主梁应力、主梁竖向变形、主拱竖向变形;均匀试验法表明:主梁竖向变形、主拱竖向变形、主梁应力、主拱应力的主要敏感参数分别为主梁重力密度、吊杆间距、吊杆间距、吊杆弹性模量。结论 基于均匀试验和多元回归分析法的参数敏感性分析可靠性强,能够揭示参数变化与结构力学行为的内在联系和规律,指导大跨径辐射式提篮吊杆拱桥的施工,为同类桥梁的参数敏感性分析提供参考。

In order to study the mechanical behavior characteristics and control strategy of long-span radial suspender basket arch bridge,the influence of different design parameters on the structural response of the arch bridge is explored.The ABAQUS model of tied arch bridge with a span of 255 m is established and based on the uniform test and multiple regression analysis method are introduced.the changes of structural parameters such as main girder weight,boom elastic modulus,cable force deviation and boom spacing are analyzed.The results show that the most sensitive response in the bridge state is the main arch stress,the main beam stress,the vertical deformation of the main beam and the vertical deformation of the main arch.The uniform test method shows that the main sensitive parameters of the vertical deformation of the main girder,the vertical deformation of the main arch,the stress of the main girder and the stress of the main arch are the weight of the main girder,the spacing of the hangers,the spacing of the hangers and the elastic modulus of the hangers.The reliability of parameter sensitivity analysis based on uniform test and multiple regression analysis method is strong,which can reveal the internal relationship and law between parameter change and structural mechanical behavior,guide the construction of longspan radial basket handle boom arch bridge,and provide reference for parameter sensitivity analysis of similar bridges.