基于动态系数的静动力有限元模型修正研究

摘要

To make up for the deficiency of the traditional combined static and dynamic finite element model updating(FEM updating), give full play to its joint action, this paper proposes a improved method that based on sensitivity analysis to calculate static and dynamic component index weight, and combined the dynamic weight coefficient of static and dynamic single objective function to update the finite element model, then applied it to the grillage model of the continuous curve girder bridge, and compared with correction results of the traditional method. The analysis shows that the combination of static and dynamic updating method can reduce the target response error between the calculated values and measured values to the half of updating before , or more, at the same time ,the improved method proposed in this paper can be proved more efficient and have the higher correction accuracy and great engineering application value.%为弥补传统联合静动力有限元模型修正的不足,充分发挥其联合作用,提出一种基于灵敏度分析计算静动态分项指标权重,综合运用静动力单目标函数动态权重系数的静动力联合修正方法,利用其修正曲线连续梁桥的梁格模型,并与传统方法的修正结果进行对比.研究结果表明,联合静动力的修正方法可减小各目标响应计算值与实测值间的误差至修正前的一半或更多,而本文提出的改进方法有效性更好,修正精度更高,具有较大的工程应用价值.