大跨度钢筋混凝土箱型拱桥动力特性分析

Analysis of dynamic characteristics of a large-span reinforced concrete box arch bridge

本文以拱上建筑为拱式结构的某大跨度钢筋混凝土箱形拱桥为工程背景,通过对该桥进行环境振动测试获得桥梁振动特性,采用有限元分析软件Midas/civil建立该大桥的空间有限元模型并进行理论模态分析,把模型中考虑与不考虑拱上建筑刚度的动力特性理论计算结果与实测结果进行比较分析,得出一些有意义结论。

In this paper,the field test under ambient vibration of a large-span reinforced concrete box arch bridge is performed to get the dynamic characteristics testing result.The three-dimensional finite element model（FEM） of the bridge is established by using the general purpose finite element program Midas/civil,and the modal analysis in the FEM is performed to get the theoretical dynamic characteristics considerating the spandrel construction or not.Some important conclusions are obtained by comparing the theoretical result with the testing result.