基于动静载试验的大跨度混凝土拱桥承载力评定

Bearing Capacity Evaluation of Long-span Concrete Arch Bridges Based on Dynamic and Static Load Tests

桥梁作为我们日常交通出行中不可缺少的构筑物,随着时间的延伸,其承载力和安全性等性能却在不断降低。本文以某大跨度混凝土拱桥为例,运用Midas建立有限元理论分析计算模型,并通过动静载试验,获得大桥结构在静载试验下结构应变及挠度变化情况,动载试验下结构的自振频率及冲击系数等动力特性,从而判断该桥的实际承载能力是否满足结构的安全使用要求,建立桥梁“指纹”档案。

As an indispensable structure in our daily traffic,bridges,with the extension of time,their performance such as bearing capacity and safety are constantly decreasing.This paper takes a long-span concrete arch bridge as an example,using Midas to establish a finite element theoretical analysis and calculation model,and through the dynamic and static load test,the structural strain and deflection changes of the bridge structure under the static load test are obtained,dynamic characteristics such as natural vibration frequency and impact coefficient of the structure under dynamic load test,in this way,it is judged whether the actual bearing capacity of the bridge meets the requirements of normal use,to ensure the safety of the structure,and to establish a bridge“fingerprint”file.