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Bridge flexural rigidity calculation using measured drive-by deflections
Journal of Civil Structural Health Monitoring ( IF 4.4 ) Pub Date : 2020-06-27 , DOI: 10.1007/s13349-020-00419-y
Daniel Martinez , Abdollah Malekjafarian , Eugene OBrien

This paper uses simulated deflections on a bridge taken from a model of an instrumented moving vehicle in an attempt to back calculate the distribution of flexural rigidity along the bridge length and hence to evaluate bridge condition. Eight sensors are simulated at different locations on the vehicle. It is assumed that measured deflections are absolute, i.e. they have been corrected for vehicle motion and that the characteristics of the vehicle are known. The unit load theorem is used to relate the measured deflections to the reciprocals of flexural rigidity at every location on the bridge. A Blackman window filter is used to regularise the problem and to improve the conditioning of an ill-conditioned system of equations. In addition, a moving average filter is used to reduce the influence of noise and dynamics, which are sources of inaccuracy in this study. This method is shown to give good results in indicating the presence and intensity of bridge damage and contains some weak information on location.



中文翻译:

利用测得的驱动挠度计算桥梁抗弯刚度

本文使用从有轨车辆的模型中提取的模拟挠度,试图反算沿桥梁长度的抗弯刚度分布,从而评估桥梁状况。在车辆的不同位置模拟了八个传感器。假设测得的挠度是绝对的,即已针对车辆运动对其进行了校正并且已知车辆的特性。单位载荷定理用于将测得的挠度与桥上每个位置的抗弯刚度的倒数相关。Blackman窗滤波器用于对问题进行正则化,并改善病态方程组的条件。此外,使用移动平均滤波器可减少噪声和动态影响,这是本研究中不准确的原因。该方法在指示桥梁损坏的存在和强度方面显示出良好的结果,并且包含一些位置信息。

更新日期:2020-06-27
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