基于动力测试的混凝土连续梁桥有限元模型修正  

Finite element model updating on continuous concrete girder bridge based on dynamic test

作　　者：赵崇基 张巍[1] 刘志华[2] 韩之江[2] 

机构地区：[1]太原理工大学建筑与土木工程学院,山西太原030024 [2]山西省交通科学研究院,山西太原030024

出　　处：《广西大学学报（自然科学版）》2016年第4期1264-1270,共7页Journal of Guangxi University（Natural Science Edition）

基　　金：国家自然科学基金资助项目(51408393)

摘　　要：为探讨有限元模型修正方法在桥梁结构运营安全性能评估中的有效性,提出了基于动力测试的混凝土连续梁桥有限元模型修正方法。利用有限元软件ANSYS建构了装配式预应力混凝土连续箱梁桥的有限元模型,以动力试验获得竖向前6阶自振频率作为状态变量,构造目标函数。通过分析目标函数对设计参数的灵敏度,选取灵敏度高的设计参数对模型进行修正,调整了模型的物理参数,使模型计算值与试验结果在合理的误差范围内。而后对修正后的模型按照现场实桥荷载试验加载工况进行加载,用现场实桥荷载试验的结果验证了模型修正方法的正确性,表明了修正后的模型能够较准确地反映桥梁结构的实际运营状况,可作为桥梁运营安全性能评估以及维修加固的基准分析模型,具有实际的工程应用价值。In order to explore the effectiveness of finite element model updating method in safety performance assessment of bridge structures,a finite element（ FE） model updating method for continuous concrete girder bridge structure based on dynamic test is proposed. The finite element model of a prefabricated prestressed continuous concrete girder bridge was set up with ANSYS. An objective function was constructed by taking the first six orders of vertical vibration natural frequency as the state variables. After the sensitivity analysis was conducted on the design variables,high sensitivity design variables were selected to modify the model. The results showed that,after the model being modified,the errors between the calculated values of the model and the test results converged into a reasonable error range. Afterwards,the updated model is loaded according to the loading of actual bridge,and the test results of the bridge demonstrate the validity of the model updating meth-od,which proves that the updated FE model can accurately simulate the operation of the bridge structure and can be used as the safety performance evaluation and maintenance model of bridge.The method has practical value for engineering application.

关 键 词：混凝土连续梁桥 有限元 模型修正 动力测试 

分 类 号：U448.23[建筑科学—桥梁与隧道工程]