大跨度钢管混凝土拱桥自振特性分析

Analysis of characteristics of free-vibration of long span steel tube concrete arch bridge

将大跨钢管混凝土拱桥简化为空间动力计算有限元模型,模型一不考虑基础-结构相互作用,模型二以弹簧作为考虑基础-结构相互作用的边界条件,用SUBS程序计算其自振特性,将计算结果进行比较,得出一些重要的结论.

A dynamic calculation FEM model of long span ：steel tube concrete arch bridge is presented by simplifying the Long Tan-he River Bridge. In one model, the interaction of foundation-structure is not calculated, and in another model, springs are used as boundary conditions for taking the interaction of foundation-structure into consideration. The characteristics of free-vibration of the two models is solved by SUBS program. Compared with the results of the interaction of foundation-structure, some important conclusions are： drawn from the above study.