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首页> 外文期刊>Journal of intelligent material systems and structures >Damage identification and bearing capacity evaluation of bridges based on distributed long-gauge strain envelope line under moving vehicle loads
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Damage identification and bearing capacity evaluation of bridges based on distributed long-gauge strain envelope line under moving vehicle loads

机译：车辆运动荷载下基于分布长应变包络线的桥梁损伤识别与承载力评估

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In this article, a new method to identify damage and assess the bearing capacity of a bridge is put forward, and the long-gauge strain influence line coefficient is chosen as the damage index. First, the relationship between the local element bending stiffness and long-gauge strain was studied according to the theory of the strain influence line under moving vehicle loads. Then, the static strain response is extracted from the long-gauge strain history using empirical mode decomposition method, and the maximum value is used to construct the strain envelope coefficient curve. A series of studies on damage identification and bearing capacity assessment based on the long-gauge strain envelope coefficient index are conducted, and a real bridge test is carried out on a continuous box girder bridge. The numerical analysis and practical bridge test results show that the method exhibits good performance in locating and quantifying damage, and that it has engineering significance in bearing capacity evaluation and post-bridge structure reinforcement design.
机译：提出了一种识别损伤并评估桥梁承载力的新方法，并选择长应变应变影响线系数作为损伤指标。首先，根据车辆运动载荷作用下的应变影响线理论，研究了局部单元的弯曲刚度与长应变的关系。然后，使用经验模式分解方法从长应变历史中提取静态应变响应，并使用最大值构建应变包络系数曲线。进行了一系列基于长应变应变包络系数指标的损伤识别和承载力评估的研究，并在连续箱梁桥上进行了实测桥试验。数值分析和实际桥梁试验结果表明，该方法在损伤的定位和量化方面具有良好的性能，对承载力评估和桥梁后结构加固设计具有工程意义。

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