联合模态柔度和静力位移的桥梁有限元模型修正方法

利用商用软件ANSYS提供的零阶和一阶优化算法,通过1个仿真简支梁有限元模型修正算例,比较了不同目标函数的有限元模型修正效果,提出了一种联合动力模态柔度和静力位移的有限元模型修正方法,并将这种方法运用于一座加固后的刚架拱桥的有限元模型修正,建立起了该桥加固后的基准有限元模型。结果表明:利用修正后的刚架拱桥有限元模型计算的静、动力特性与实测结果吻合良好,这种联合静、动力的有限元模型修正方法具有比较好的模型修正效果,修正后的桥梁有限元模型可以服务于桥梁健康监测和安全评估。

Finite Element Model Updating Method of Bridge Combined Modal Flexibility and Static Displacement

The effects of structural finite element(FE) model updating based on different objective functions were compared through numerical example of FE model updating of a simply-supported beam using the zero-order and first-order optimization arithmetic in commercial ANSYS program.After that,an FE model updating method combined static displacement and dynamic modal flexibility was proposed.Based on the proposed method,the FE model of a rigid-frame arch bridge after strengthening was updated and the baseline FE model of the arch bridge after strengthening was constructed.The results show that the static and dynamic characteristics obtained from the updating FE model and field testing correlate very well,and effect of FE model updating combined the structural static and dynamic characters together is good.The updating FE model of bridge may serve as the base of health monitoring and safety evaluation of bridge.