基于健康监测的连续刚构桥有限元模型确认(Ⅰ)——基于响应面法的有限元模型修正

Finite element model validation of the continuous rigid frame bridge based on structural health monitoring Part Ⅰ:FE model updating based on the response surface method

有限元模型修正不能考虑不确定性和进行响应预测,而模型确认是模型修正的发展,该系列论文建立了桥梁有限元模型确认的基本方法。主要讨论模型确认的关键步骤之一——基于响应面的桥梁有限元模型修正方法,包括试验设计、参数筛选、响应面模型选择以及模型检验等;基于下白石大桥的实时健康监测,利用响应面方法成功地对下白石大桥的有限元模型进行修正。结果表明:有限元模型修正后的计算结果与实测结果比较吻合,最大相对误差不超过6%,修正后的有限元模型可以进一步应用于模型确认,对桥梁健康监测和安全评估有益。

The uncertainty and accuracy can not be considered in the finite element（FE） updating,and the FE model validation a development of the FE model updating.In the two-paper series,the methods of FE model validation were established.As one of the key problems in the FE model validation,the model updating method based on the response surface model was developed.Several key steps,such as the design of experiments,parameter screening,selection of response surface model and model accuracy inspection,were included.Using the online bridge health monitoring system of the Xiabaishi bridge,the finite element model updating based on the response surface model was conducted successfully.It can be concluded that the results from the updated model are in good agreement with the measurements,with the maximum error being no larger than 6%.The updated finite element model can be employed for model validation,bridge health monitoring and safety evaluation.