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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。
Through theoretical research and numerical calculation, the roll stability and seismic response of long-span CFST double-ribbed arch bridge are analyzed in detail. First of all, based on the approximate analytical solution of the stability of the double-ribbed arch bridge under vertical uniform load, the influences of the bracing, the stiffness of the bracing and other factors on the stability are discussed. Secondly, based on the theory of multi-point excitation and the concept of quasi-static displacement, the dynamic characteristics of arch bridge and the response under earthquake action are introduced. The effect of traveling wave effect is also discussed. The analysis shows that the effect of seismic traveling wave has a great influence on the long-span arch bridge, and the setting of the bracing is sensitive to the stability.