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Damage identification method for continuous girder bridges based on spatially-distributed long-gauge strain sensing under moving loads

机译：荷载作用下基于空间分布长应变应变传感的连续梁桥损伤识别方法

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摘要

A novel damage identification method for concrete continuous girder bridges based on spatially-distributed long-gauge strain sensing is presented in this paper. First, the variation regularity of the long-gauge strain influence line of continuous girder bridges which changes with the location of vehicles on the bridge is studied. According to this variation regularity, a calculation method for the distribution regularity of the area of long-gauge strain history is investigated. Second, a numerical simulation of damage identification based on the distribution regularity of the area of long-gauge strain history is conducted, and the results indicate that this method is effective for identifying damage and is not affected by the speed, axle number and weight of vehicles. Finally, a real bridge test on a highway is conducted, and the experimental results also show that this method is very effective for identifying damage in continuous girder bridges, and the local element stiffness distribution regularity can be revealed at the same time. This identified information is useful for maintaining of continuous girder bridges on highways.
机译：提出了一种基于空间分布长应变应变传感的混凝土连续梁桥损伤识别新方法。首先，研究了连续梁桥的长应变应变影响线随车辆在桥上位置的变化规律。根据这种变化规律，研究了长应变应变历史区域分布规律的计算方法。其次，根据长应变历史区域的分布规律进行了损伤识别的数值模拟，结果表明该方法对损伤识别有效，不受速度，轴数和重量的影响。汽车。最后，在公路上进行了真实的桥梁试验，实验结果还表明，该方法对于连续梁桥损伤的识别非常有效，同时可以揭示局部单元刚度分布规律。识别出的信息对于维护高速公路上的连续梁桥很有用。

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