钢筋混凝土桥梁结构动力有限元模型修正

RC Bridges Dynamic Finite Element Model Updating

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环境振动实测值。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。

Setting up a model for the structural finite element, there are inevitably differences between the model and the real bridge. To make the model accurate, it is necessary to upgratde the model by using ambient vibration measurement results. In this paper, the opti- mization function of ANSYS is used to update the real bridge＇ s model. The final updated FE model for the real bridge is able to produce natural frequencies closer to the test ones. The updated FE model is useful for the reference model to structure damage and condition assessment.