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薛刚，王显
(内蒙古科技大学建筑与土木工程学院内蒙古包头014010)
关键词:模型修正;灵敏度分析;环境振动;有限元模型
中图分类号:U448. 21 + 5 文献标识码:A
摘要:基于优化原理的有限元模型修正技术的发展，为大型桥梁结构的模型修正提供了便利． 本文以包头黄河大桥二桥为背景，利用该桥健康监测系统提供的环境振动测试信息，并基于结构特征值灵敏度分析选择的修正参数，对该桥进行结构动力模型修正．修正后的有限元模型振动基频更接近于环境激励下的测量结果，表明大型通用软件提供的优化算法可以有效的实施动力模型修正．
Model updating of a prestressed concrete continuous bridge based on ambient vibration
XUE Gang，WANG Xian
(Architecture and Civil Engineering School，Inner Mongolia University of Science and Technology，Baotou 014010，China)
Key words:model updating;sensitivity analysis;ambient vibration;finite element model
Abstract:The development of the model updating technology based on the optimization theory provides an advantage for the model updating of huge bridge structure． Based on the background of Baotou Huanghe Bridge，the dynamic model of the bridge was modified
with the help of parameter sensitivity analysis and ambient vibration measurements offered by the health monitoring system． The basic frequency of the modified model approached to the measured result under ambient vibration，which indicated that the optimization algorithm provided by large-scale general software can do the model updating effectively．