Structural health monitoring has contrived a path for ascertaining the condition of any structure under operating or critical loads. This paper investigates a possible application of the electro-mechanical impedance (EMI) technique in diagnosing high-cycle and low-strain fatigue damage in the reinforced concrete (RC) structures. The experimental study is conducted on a RC frame structure of overall size 1.45 m (width) x 1.22 m (height) using lead zirconate titanate (PZT) patches embedded in form of concrete vibration sensors (CVS), all operating in d-31 mode, for accessing fatigue damages till the structure fails at 5.5 million cycles. The damage dependent equivalent stiffness parameters (ESP) are obtained from the conductance and the susceptance signatures for each CVS at different damage states for enabling the estimation of residual fatigue life. For the first time, results have revealed a good comparison in obtaining flexural rigidity-based stiffness using global dynamic technique (GDT) and CVS-identified stiffness using EMI technique for the full-life span of the RC structure under high-cycle fatigue. A relation for estimating residual fatigue life of the structure with change in normalized damping has been also derived for this type of loading environment.

结构健康监测为确定在运行或关键负载下任何结构的状况创造了一条途径。本文研究了机电阻抗（EMI）技术在诊断钢筋混凝土（RC）结构中的高周疲劳和低应变疲劳损伤中的可能应用。使用整体嵌入d-31模式的混凝土振动传感器（CVS）形式的锆钛酸铅（PZT）贴片，对总尺寸为1.45 m（宽）x 1.22 m（高）的RC框架结构进行了实验研究。 ，用于获得疲劳损伤，直到结构在550万次循环中失效。根据每个CVS在不同损伤状态下的电导和电纳信号，获得与损伤有关的等效刚度参数（ESP），以便估算剩余疲劳寿命。首次，结果表明在高循环疲劳下，RC结构的整个寿命期间，使用全局动力技术（GDT）获得基于挠曲刚度的刚度与使用EMI技术获得CVS识别的刚度的良好比较。对于这种类型的加载环境，还得出了一种估算结构的剩余疲劳寿命与归一化阻尼变化的关系。结果表明，对于在高周疲劳下的RC结构的整个寿命，使用全局动力技术（GDT）获得基于弯曲刚度的刚度与使用EMI技术获得CVS识别的刚度，具有很好的比较。对于这种类型的加载环境，还得出了一种估算结构的剩余疲劳寿命与归一化阻尼变化的关系。结果表明，对于在高周疲劳下的RC结构的整个寿命，使用全局动力技术（GDT）获得基于弯曲刚度的刚度与使用EMI技术获得CVS识别的刚度，具有很好的比较。对于这种类型的加载环境，还得出了一种估算结构的剩余疲劳寿命与归一化阻尼变化的关系。