采用静态和动态法改进有限元模型进行桥梁评估

通过有限元模型升级,将有限元分析与现场测量相结合,其潜力毋庸置疑。然而,简单化的初始模型和缺少测量可能导致升级的模型参数隐藏了不准确的模型假设,而不是提高实际结构参数的评估。因此,所提出方法的目标主要是在采用非线性优化对参数进行评估之前,借助手工模型的精度消除不精确的模型简化。此外,引进多级响应目标函数,结合不同类型的测量获得参数评估的坚实基础。所提方法被用于世界上最大的Svinesund单孔桥,研究表明采用非线性模型可对模型参数进行精确评估。

Improved Bridge Evaluation Through Finite Element Model Updating Using Static and Dynamic Measurements

The potential of combining finite element(FE)analysis with on-site measurement through finite element model updating is indisputable.However,simplified initial models and too few measurements can lead to updated model parameters which conceal inaccurate modelling assump-tions rather than improve estimates of the actual structural parameters.Therefore,the methodology proposed aims primarily to eliminate inaccurate modelling simplification by means of manual model refinements before parameters are estimated b...