Laboratory Investigation on Detecting Bridge Scour Using the Indirect Measurement from a Passing Vehicle
Laboratory Investigation on Detecting Bridge Scour Using the Indirect Measurement from a Passing Vehicle
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DOI：
10.3390/rs14133106
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发表时间：
2022
期刊：
影响因子：
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通讯作者：
Bin Zhang;Hua Zhao;Chengjun Tan;E. Obrien;P. Fitzgerald;Chul-Woo Kim
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文献类型：
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作者：
Bin Zhang;Hua Zhao;Chengjun Tan;E. Obrien;P. Fitzgerald;Chul-Woo Kim
对于有面层基础的桥梁，冲刷是桥梁失效的主要原因之一。在结构健康监测方面，基于振动的冲刷检测技术在过去20年中受到越来越多的关注。冲刷发生在江河或海洋的水面以下，造成设备安装和维护的困难。近年来，采用间接测量过往车辆响应的“驾车”健康监测概念因其使用方便、成本低廉而得到迅速发展。本文提出了一种利用车辆在运行车速下的响应来检测冲刷的方法。将小波变换应用于车辆加速度，得到小波能量。结果表明，随着冲刷破坏程度的增加，小波能量也随之增大。然而，小波能量也可能受到现场运行环境的影响，如传感器噪声和其他变量，这在实际中干扰了冲刷的识别fi。因此，在这项工作中，提出了一种基于统计小波的方法来有效地检测冲刷的存在甚至位置。数值模拟和实验室实验验证了该方法的可行性。结果表明，该方法具有较好的间接量测检测能力。基于小波的能量作为桥梁冲刷检测的损伤指标更为可靠。数值计算表明，基于小波的冲刷损伤检测方法具有间接检测冲刷损伤的潜力。
: For bridges with surface foundations, scour is one of the main reasons for bridge failures. In regard to structural health monitoring, vibration-based scour detection techniques have received increasing attention over the past two decades. Scour occurs below the water surface in rivers or sea, leading to difficulty in equipment installation and maintenance. Recently, the concept of “drive-by” SHM using the indirect measurement of passing vehicle responses has been developed rapidly due to its convenience and low cost. This paper proposes a method to detect scour using the vehicle responses under an operational vehicle speed. The wavelet transform was applied to vehicle accelerations to obtain the wavelet energy. It was found that the wavelet energy increases with the increase in the scour damage level. However, the wavelet energy may also be affected by the on-site operating environments, such as sensor noise and other variabilities, which interferes with the identification of scour in practice. Hence, in this work, a statistical-wavelet-based approach was presented to effectively detect the presence of scour and even its location. The feasibility of the proposed approach is verified in both numerical simulation and lab experiments. The results show that the proposed method has a good potential to detect scour using indirect measurements. Wavelet-based energy is more reliable as a damage indicator for detecting bridge scour. It is numerically demonstrated that the proposed wavelet-based method has the potential to detect scour damage using indirect measurements.