拱墩相对刚度对大跨度上承式系杆拱桥动力特性影响

Influence of relative stiffness of arch ring and pier on dynamic characteristics of long-span deck tied arch bridge

常规的大跨度系杆拱桥以中承式和下承式形式为主,对于上承式系杆拱桥的受力特点和动力特性的研究相对较少。本文以福州会展岛规划2路桥为工程背景,通过有限元建模分析,研究大跨度上承式多跨系杆拱桥的动力特性和拱墩相对刚度对自振特性的影响,表明大跨度上承式多跨系杆拱桥平面内的稳定性要弱于面外的稳定性,拱肋和桥墩的相对刚度对系杆拱桥的面内抗弯刚度和扭转刚度基本没有影响。本文完善了系杆拱桥的计算理论系统和设计方法,为类似工程提供借鉴。

The long-span tied arch bridge is mainly in the form of half through and lower through,and the research on the mechanical characteristics and dynamic characteristics of the upper through tied arch bridge is less.Planned No.2 Road Bridge of Fuzhou Convention and Exhibition Island is taken as the engineering background,the dynamic characteristics of the long-span through tied arch bridge and the influence of the relative stiffness of the arch pier on the natural vibration characteristics are studied through finite element modeling and calculation.It is found that the in-plane stability of the long-span through tied arch bridge is weaker than the out of plane stability,and the relative stiffness of the arch pier has little influence on the in-plane bending stiffness and torsional stiffness of the tied arch bridge.The calculation theory system and design method of tied arch bridge are improved,which can provide reference for similar projects.