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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。
Through the finite element model upgrade, the finite element analysis combined with the field measurement, its potential is beyond doubt. However, simplifying the initial model and the lack of measurement of the model parameters that may lead to the upgrade hide the inaccurate model assumptions, rather than raising the assessment of the actual structural parameters. Therefore, the main objective of the proposed method is to eliminate inaccurate model simplification with the help of the accuracy of the manual model before evaluating the parameters by nonlinear optimization. In addition, the introduction of multistage response objective function, combined with different types of measurements to obtain a solid foundation for parameter assessment. The proposed method is applied to the largest single-hole Svinesund bridge in the world and studies show that nonlinear models can be used to accurately estimate model parameters.