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首页> 外文期刊>Journal of bridge engineering >Strain-Based Damage-Assessment Method for Bridges under Moving Vehicular Loads Using Long-Gauge Strain Sensing
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Strain-Based Damage-Assessment Method for Bridges under Moving Vehicular Loads Using Long-Gauge Strain Sensing

机译：动量荷载作用下桥梁的基于应变的损伤评估方法

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摘要

A novel damage-assessment method based on long-gauge strain sensors is presented in this paper. This method is not only suitable for rapid diagnosis of structures, but also it can be applied to long-term structural health monitoring of structures. First, theoretical derivation showed that the damage index strain time history area ratio (STHAR) of bridges under moving vehicular load was only in relation to the local bending stiffness, and it was independent of the weight, velocity, and axle numbers of the vehicular load. Second, the influence of vehicular weight, vehicular velocity, axle number, sensor gauge length, and measurement error on the method was investigated by simulation. In addition, a case study of a lab experiment was also examined. The results show that all damages can be localized accurately, and the mean relative errors between the estimated and actual damage extent were 0.7% and 12.3% for simulation and experiment, respectively. Finally, the robustness of the method was verified by field testing of a real bridge (in the undamaged state). The tendency of the damage index variation was predicted by finite-element method, and the mean relative error between the estimated and actual damage extent was found to be 12.6%. (C) 2016 American Society of Civil Engineers.
机译：提出了一种基于长应变传感器的损伤评估方法。该方法不仅适用于结构的快速诊断，还可以用于结构的长期结构健康监测。首先，理论推导表明，在移动车辆载荷下桥梁的损伤指数应变时程面积比（STHAR）仅与局部弯曲刚度有关，并且与车辆载荷的重量，速度和轴数无关。其次，通过仿真研究了车辆重量，车辆速度，轴数，传感器仪表长度和测量误差对方法的影响。此外，还研究了实验室实验的案例研究。结果表明，所有损伤都可以精确定位，模拟和实验中估计和实际损伤程度之间的平均相对误差分别为0.7％和12.3％。最后，通过对真实桥梁（未损坏状态）的现场测试验证了该方法的鲁棒性。用有限元方法预测了损伤指数的变化趋势，估计和实际损伤程度之间的平均相对误差为12.6％。 （C）2016年美国土木工程师学会。

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