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首页> 美国卫生研究院文献>Sensors (Basel Switzerland) >Damage Identification Method of Box Girder Bridges Based on Distributed Long-Gauge Strain Influence Line under Moving Load
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Damage Identification Method of Box Girder Bridges Based on Distributed Long-Gauge Strain Influence Line under Moving Load

机译：基于分布式长仪应变影响线在移动负荷下的箱梁桥梁损伤识别方法

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摘要

A new method was proposed for the damage identification of box girder bridges under moving load, wherein the difference of strain influence line (DSIL) was taken as an index to represent the long-gauge strain difference before and after damage. The damage identification theory based on long-gauge strain influence lines was derived for box girder bridges with shear lag effect under consideration, and a regularized index DSIL was proposed for the quantitative identifications of damage location and extent. A series of experiments were carried out to study the influences of speed, vehicle type, and vehicle weight on the damage identification, and the experimental data were obtained by long-gauge fiber Bragg grating strain sensors. Moreover, numerical simulations were performed to confirm the method. The experimental and numerical results show that the method can locate the damage accurately, and quantitatively identify the damage extent under different working conditions. The experimental damage extent is generally slightly higher than the theoretical, with an average identification error smaller than 5%. Additionally, the relative error of damage extent is smaller than 3% under different working conditions. Thus, the effectiveness of this method was verified.
机译：提出了一种用于移动负荷下箱梁桥的损伤识别的新方法，其中应变影响线（DSIL）的差异为指数，以表示损伤前后的长度计应变差异。基于长仪应变影响线的损伤识别理论是针对剪切滞后效应的盒梁桥来源的，并且提出了正则化指数DSIL，用于定量损伤定位和程度的定量鉴定。进行了一系列实验，以研究速度，车辆类型和车辆重量对损伤识别的影响，并且通过长尺光纤布拉格光栅应变传感器获得实验数据。此外，进行数值模拟以确认该方法。实验和数值结果表明，该方法可以准确地定位损伤，并在不同的工作条件下定量识别损伤程度。实验损伤程度一般略高于理论，平均识别误差小于5％。另外，在不同的工作条件下，损坏程度的相对误差小于3％。因此，验证了该方法的有效性。

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