车致振动响应递归量化分析在桥梁结构损伤识别中的应用

Bridge damage identification using recurrence quantification analysis of vehicle-induced vibration response

基于移动车辆引起的桥梁结构动力响应,采用递归量化分析的方法对结构进行损伤识别。用固定宽度的滑动窗将桥梁结构上任意两个位置的响应信号分成若干小段,并对每一小段信号进行递归量化分析,进而提取特征构造损伤指标。损伤向量随着滑动窗的移动得到每一个相对位置的损伤指标,最终实现结构的损伤识别。通过数值模拟验证上述方法,并讨论了单损伤工况和多损伤工况,分析了损伤位置、损伤程度、车辆速度、噪声水平等因素的影响。最后制作实验室模型对递归量化分析的结构损伤识别方法进行了试验验证。数值模拟和试验结果表明,基于递归量化分析的损伤识别方法可以有效识别移动车辆作用下的桥梁结构损伤。

Based on the dynamic response caused by moving vehicles,a recurrence quantification analysis-based structural damage detection method is proposed.The acceleration response is split into several segments using a moving window.The recurrence plots are constructed to analyze and present the characteristics of each segmented response signal.The recurrence quantification analysis is used to quantify the damages and construct the damage feature.The damage features of each relative position are assem⁃bled as a vector for the location of the structural damage.The proposed method is validated by numerical simulation with the singledamage and multi-damages.The influence of damage location,vehicle speed,noise and other factors are discussed to illustrate the robustness of the proposed method.Results show that the method is a potential way for structural damage detection under opera⁃tional condition.