Damage identification of a target substructure with moving load excitation
Damage identification of a target substructure with moving load excitation
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DOI：
10.1016/j.ymssp.2012.02.002
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发表时间：
2012-07
影响因子：
8.4
通讯作者：
Jun Yu Li;S. Law
中科院分区：
文献类型：
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作者：
Jun Yu Li;S. Law
提出了一种基于动态响应重构技术的移动车辆荷载作用下子结构损伤识别方法。利用基于小波域脉冲响应函数的传递率矩阵，建立了运动荷载作用下子结构两组时间响应向量之间的关系。只需要完整目标子结构的有限元模型和损伤状态下目标子结构的实测动态加速度响应。该算法不需要子结构上运动载荷和界面力的时程。采用基于动态响应灵敏度的子结构损伤识别方法，将局部损伤建模为单元刚度因子的降低。采用自适应吉洪诺夫正则化技术，在测量中考虑噪声影响时提高了识别效果。通过单力作用下的三维箱梁桥面和双轴三维移动车辆作用下的三维箱梁桥面的数值研究，验证了所提出的子结构损伤识别方法的性能。当实测数据中含有5%的噪声时，可以识别出模拟的局部损伤。
This paper presents a substructural damage identification approach under moving vehicular loads based on a dynamic response reconstruction technique. The relationship between two sets of time response vectors from the substructure subject to moving loads is formulated with the transmissibility matrix based on impulse response function in the wavelet domain. Only the finite element model of the intact target substructure and the measured dynamic acceleration responses from the target substructure in the damaged state are required. The time-histories of moving loads and interface forces on the substructure are not required in the proposed algorithm. The dynamic response sensitivity-based method is adopted for the substructural damage identification with the local damage modeled as a reduction in the elemental stiffness factor. The adaptive Tikhonov regularization technique is employed to have an improved identification result when noise effect is included in the measurements. Numerical studies on a three-dimensional box-section girder bridge deck subject to a single moving force or a two-axle three-dimensional moving vehicle are conducted to investigate the performance of the proposed substructural damage identification approach. The simulated local damage can be identified with 5% noise in the measured data.