【摘要】 介绍了作为预应力混凝土连续梁桥的通扬运河特大桥的环境激励振动试验,并利用基于频域空间域分解的运行模态分析法进行模态参数识别,得到大桥的动力特性测试结果(模态频率和振型)。建立了大桥的初始空间有限元模型,利用上述测试结果,基于遗传算法对模型进行了修正,获得能基本准确反映上述桥梁实际结构动力行为的基准有限元模型,它可用于大桥的健康检测、状态评估和损伤识别。更多还原

【Abstract】 The paper describes thefield ambient vibration testing on a prestressed concrete continuous box-girders,named Yongyang canal super bridge.The operational modal analysis(OMA) based on the frequency and spatial domain decomposition(FSDD) were used in the output-only data model identification,and the dynamic characteristics(natural frequencies and mode shapes) of the bridge were got.The complete three-dimensionalfinite element model of the bridge was established and updated based on the above results using genetic algorithm.The baseline-nite element model of the bridge were provided,which reflects the dynamic behaviors of the bridge structure and can serve as a baseline in the long-term health monitoring,condition evaluation and damage identication of the bridge in service.更多还原