大跨中承式钢管混凝土拱桥的横撑布置

Lateral brace arrangement for large-span half-through concrete filled steel tube arch bridge

对大跨中承式钢管混凝土拱桥常用的X撑及米字撑的合理间距进行了探讨。鉴于结构自振频率、振型及弹性稳定系数的求解均可转化为源自结构动力平衡方程的特征值问题,先以结构基频及弹性稳定系数为衡量标准,对一座360 m跨的中承式钢管混凝土拱桥可能的米字撑及X撑布置方案进行了分析对比,并据此提出了X撑及米字撑的合理间距。按照布撑区域相等、横撑体系材料用量相近的原则,提出4个布撑方案,并分别进行了极限承载能力分析。结果表明,结合模态分析及弹性稳定性分析确定结构参数的方法可行;对于本文的360 m跨的中承式钢管混凝土拱桥,采用X撑即可满足刚度要求,且能获得更为轻巧的视觉效果。

The reasonable space of Mi-brace and X-brace commonly used in the large-span half-through concrete filled steel tube(CFST) arch bridge was researched.Considering that both the solution of the structure natural vibration frequency and mode as well as its elastic stability coefficient can transform into eigenvalue problem of the structure dynamic equilibrium equation,taking the fundamental frequency and the elastic stability coefficient of the structure as the evaluation criteria,the possible arrangements of ...