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在建立桥梁结构有限元模型时,所建的有限元模型与结构的真实情况不可避免地存在着差异。要建立精确的有限元模型,必须利用大桥现场环境振动测量值得到一组结构实测模态参数,用以作为有限元模型修正的基准。利用有限元分析软件ANSYS的优化功能,对桥梁结构进行模型修正,修正后有限元模型的动力特性更加趋近于实桥环境振动的实测值。修正后的结构有限元模型可以作为大桥损伤监测和整体性评估的基准。
When building the finite element model of bridge structure, the real situation of finite element model and structure built inevitably has difference. To establish the accurate finite element model, a set of structural modal parameters of the structure must be obtained by using the measured values of on-site environmental vibration of the bridge to serve as a reference for the revision of the finite element model. The finite element analysis software ANSYS optimization function is used to modify the bridge structure. The dynamic characteristics of the finite element model are closer to the measured values of actual bridge environment vibration. The revised structural finite element model can be used as a benchmark for damage monitoring and integrity assessment of the bridge.