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Damage detection of shear connectors under moving loads with relative displacement measurements

机译：通过相对位移测量来检测剪切连接器在移动载荷下的损坏

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This paper investigates the use of relative displacement measurements from the newly developed relative displacement sensors to identify the damage of shear connectors in composite bridges. Continuous Wavelet Transform and Hilbert-Huang Transform are applied to analyze the measured dynamic responses and to identify the damage of shear connectors in the composite bridge model under moving loads. Comparative studies by using the relative displacement, acceleration and displacement measurements respectively for the damage detection are conducted. A comparative study of using relative displacements and acceleration responses of the bridge under ambient excitations to monitor the shear connector conditions is also conducted. Numerical and experimental studies demonstrate that both relative displacement and acceleration measurements can identify the location and the instant of damage occurrence in shear connectors when the bridge is under moving loads. The results demonstrate that relative displacement is a better response quantity for structural health monitoring of composite bridges.
机译：本文研究了使用新开发的相对位移传感器的相对位移测量结果来确定复合材料桥梁中剪切连接器的损坏。应用连续小波变换和希尔伯特-黄变换来分析测得的动态响应，并确定在移动荷载下复合桥模型中剪切连接器的损伤。通过将相对位移，加速度和位移测量分别用于损伤检测进行了比较研究。还进行了使用环境激励下桥梁的相对位移和加速度响应来监测剪力连接器状态的比较研究。数值和实验研究表明，当桥梁在移动载荷下时，相对位移和加速度测量值都可以识别剪切连接器中的位置和发生破坏的瞬间。结果表明，相对位移是复合桥梁结构健康监测的较好响应量。

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