既有双曲拱桥承载力检测评定

Test and evaluation of bearing capacity of existing double curved arch bridge

本文以某三跨双曲拱桥为工程背景,基于现场实测数据,建立考虑腹拱、立墙共同参与受力的空间有限元模型,并基于缺损检查及静载试验结果,通过分项检算系数修正结构抗力,结合有限元分析内力结果进行承载能力评定,结果表明,该桥承载能力满足汽车-15级、人群3.0k N/m^2荷载等级的使用要求。相关检测评定过程,可为该类桥梁承载力评定提供借鉴。

In this paper,a finite element model of a three span double curved arch bridge as the engineering background is established based on the field measured data,considering the interaction between the arch and the vertical wall.Based on the results of the defect examination and static load test,the structural resistance is corrected by the calculation coefficient of the sub item,and the bearing capacity is evaluated by the finite element analysis of the internal force.The results show that the bearing capacity of the bridge meets the requirements of the vehicle-15grade and the load-3.0kN/m2grade of the crowd.The related test and evaluation process can be used for reference for evaluating the bearing capacity of this kind of bridge.