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Damage Assessment of the Z24 Bridge by FE Model Updating

机译:Z24桥梁有限元模型更新的损伤评估。

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Damage to civil engineering structures can be identified with a finite element (FE) model updating method using experimental modal data. In such a procedure the uncertain properties (e.g. stiffness distribution) in the FE model are adjusted by minimizing the differences between the measured modal parameters and the numerical (FE) predictions. In civil engineering the differences in eigenfrequencies and mode shapes are minimized, mostly identified from ambient vibrations. Since the modal data are nonlinear functions of the uncertain properties, an iterative sensitivity-based minimization method is used to solve this inverse problem. In order to reduce the number of unknowns, damage functions are used. The FE model updating technique is applied to a prestressed concrete bridge with 3 spans whose girder is damaged by lowering one of the intermediate piers. The damage pattern is identified (localized and quantified) by updating the Young's and the shear modulus.
机译:可以使用实验模态数据通过有限元(FE)模型更新方法来识别对土木工程结构的损坏。在这样的程序中,通过最小化所测量的模态参数与数值(FE)预测之间的差异来调整FE模型中的不确定特性(例如刚度分布)。在土木工程中,本征频率和振型的差异被最小化,主要是由环境振动引起的。由于模态数据是不确定属性的非线性函数,因此使用基于迭代灵敏度的最小化方法来解决此反问题。为了减少未知数,使用了损坏函数。有限元模型更新技术应用于具有3个跨度的预应力混凝土桥梁,该桥梁的梁由于降低一个中间墩而被破坏。通过更新杨氏模量和剪切模量,可以识别(定位和量化)损伤模式。

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