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Identification of prestress force from measured structural responses

机译：根据测得的结构响应识别预应力

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摘要

A method for the identification of prestress force of a prestressed concrete bridge deck is presented using the measured structural dynamic responses. A Euler-Bernoulli beam finite element model is used to represent the bridge deck, and the prestress force is modelled as the axial prestress force in each beam element. The state-space approach is used to calculate the dynamic responses of the structure and the sensitivities of dynamic responses with respect to the structural parameters, such as the prestress force, flexural rigidity, etc. The prestress force in each beam element is taken to be a system parameter, and it is expressed explicitly in the system equation for forward analysis. The prestress force in each element is identified using a sensitivity-based finite element model updating method in the inverse analysis. Data obtained from a single or multiple accelerometers or strain gauges are used in the identification. Both sinusoidal and impulsive excitations are illustrated to give very good results. Two numerical simulations are presented to illustrate the effectiveness and robustness of the proposed method. Laboratory work on an axially prestressed concrete beam is also included as a practical application.
机译：利用所测得的结构动力响应，提出了一种识别预应力混凝土桥面板预应力的方法。使用Euler-Bernoulli梁有限元模型来表示桥面板，并且将预应力建模为每个梁单元中的轴向预应力。状态空间法用于计算结构的动力响应以及动力响应相对于结构参数（如预应力，抗弯刚度等）的敏感性。考虑每个梁单元中的预应力系统参数，并在系统方程式中明确表示以进行正向分析。在反分析中，使用基于灵敏度的有限元模型更新方法识别每个单元中的预应力。从单个或多个加速度计或应变仪获得的数据用于识别。示出了正弦激励和脉冲激励都给出了很好的结果。进行了两个数值模拟，以说明该方法的有效性和鲁棒性。作为实际应用，还包括在轴向预应力混凝土梁上进行的实验室工作。

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