大跨径钢管混凝土拱桥的稳定与振动

通过理论研究和数值计算,详细分析了大跨径钢管混凝土双肋拱桥的侧倾稳定性和地震响应。首先,根据双肋拱桥结构在竖向均布荷载作用下的侧倾稳定临界力的近似解析解,讨论了横撑设置、横撑刚度等因素对稳定性的影响。其次,基于多点激振理论和拟静力位移概念,介绍了拱桥结构的动力特点和地震动作用下的响应,并讨论了行波效应的影响。分析表明,地震行波作用对大跨径拱桥影响很大,横撑设置对稳定性敏感。

Stability and Vibration of Long Span CFST Arch Bridges

The lateral buckling and seismic response of the space arch structure composed of double main arch ribs with transverse braces are analyzed in this paper.First,the elastic critical buckling load of this kind of structures is deduced according to the principle of minimum potential energy,the influences of the space length and the stiffness of bracing beams on the lateral stability of structure are discussed.Secondly,the seismic response behavior is systematically introduced based on the theory of multi-support seismic excitations and the conception of pseudo-static displacement.The numerical results show that the travelling wave effect has significant influence on the long span arch bridge,the arrangement of bracing beams is sensitive to stability.