结构行为一致多尺度有限元模型修正及验证

Updating and verification for multi-scale finite element model of structure behavior

研究面向结构健康监测和损伤评估的含局部细节的结构多尺度有限元模型的修正和验证方法.以实验室的大跨桥梁结构钢箱梁纵向加劲桁架缩尺试样为研究平台,具体讨论了多尺度模型修正和验证的实施过程.首先分析了影响此结构多尺度模型精度的一些因素,如边界约束刚度、焊趾及其附近的几何及材料参数等,然后采用基于灵敏度的方法对多尺度模型进行修正,并通过不同于修正过程的加载工况和不同位置处的实测数据从动力特性和静力响应等多方面对所建的结构多尺度有限元模型进行了验证.结果表明:基于子结构方法建立的结构行为一致多尺度模型是有效的.

The method on concurrent multi-scale model of structural behavior（CMSM-of-SB） for the purpose of structural health monitoring including model updating and validating has been studied.The detailed process of model updating and validating is discussed in terms of reduced scale specimen of the steel box girder in longitudinal stiffening truss of a long span bridge.Firstly,some influence factors affecting the accuracy of the CMSM-of-SB including the boundary restraint rigidity,the geometry and material parameters on the toe of the weld and its neighbor are analyzed using sensitivity method.Then,sensitivity-based model updating technology is adopted to update the developed CMSM-of-SB and model verification is carried out through calculating and comparing stresses on different locations under various loading from dynamic characteristic and static response.It can be concluded that the CMSM-of-SB based on the substructure method is valid.