基于响应面法的钢箱梁桥有限元模型修正

Updating the Finite Element Model of Steel Box Girder Bridge Based on Response-surface Method

对桥梁有限元模型进行修正,对于提高有限元模型精度具有重要的意义。作者基于实测模态数据,以频率残差作为目标函数,采用中心差分法进行灵敏度分析得到待修正参数,采用正交试验数据拟合得到相应的响应面方程,最后采用遗传算法对响应面方程进行了优化求解。计算结果表明,经过修正后的有限元模型精度显著提高,基于响应面法的有限元模型修正具有思路清晰、求解效率高、精度高等优点。

It's very important to update the finite element model of bridge structure for improving the accuracy.In this paper,based on the measured modal data,sensitivity analysis based on central difference method was adopted to get the awaiting correction parameters,the corresponding response surface equations were obtained by fitting the data gotten from the orthogonal test,and solved by genetic algorithm.The experimental results show that the accuracy of the modified finite element model improves,and finite element model updating based on response-surfaced has the advantages of clear thinker,high computational efficiency,higher precision and so on.