Abstract
Carbon fiber reinforced polymer materials are widely applied in structure strengthened engineering because of the many advantages of carbon fiber reinforced polymer. However, the debonding damage between the carbon fiber reinforced polymer and host structures occurs frequently, which might lead to the brittle failure of structure components, especially flexural ones. In this paper, an electromechanical impedance-based method, an important technique in structural health monitoring, was adopted to detect the debonding damage of carbon fiber reinforced polymer plate-strengthened steel beam by using lead zirconate titanate (PZT) transducers. A carbon fiber reinforced polymer plate-strengthened steel beam specimen was fabricated in the laboratory and two PZT sensors were attached at different locations on the carbon fiber reinforced polymer plate. The impedance signatures with variation of the different degrees of the debonding damage were measured by an impedance analyzer. The root-mean-square deviation method and the cross-correlation coefficient method were used to quantify the correlation between the electromechanical impedance and the debonding damage degree. The results reflect that an electromechanical impedance-based structural health monitoring technique can serve as a good method to detect the debonding damage of carbon fiber reinforced polymer plate-strengthened steel structures.
Highlights
Concrete and steel are the most common construction materials, they are subject to corrosion [1,2], fatigue [3,4], and other adverse effects, which often lead to structural damage and may reduce the structural bearing capability and durability if not repaired in time
This serves as the principle for monitoring the debonding damage of the carbon fiber reinforced polymer (CFRP) plate-strengthened steel beam through the electromechanical impedance (EMI) method
A CFRP plate-strengthened steel beam was fabricated in the laboratory
Summary
Concrete and steel are the most common construction materials, they are subject to corrosion [1,2], fatigue [3,4], and other adverse effects, which often lead to structural damage and may reduce the structural bearing capability and durability if not repaired in time. The material discontinuity at the discontinuity the location the concentration bond end, theinstress in these areas of may the location of theatbond end, the of stress theseconcentration areas may cause the failure thecause adhesive failure of the adhesive before the steel and the plate both reach their ultimate strengths. The different debonding damage states were investigated by analyzing the debonding of CFRP plate-strengthened steel structures. Were the experimental results deviationthe method and cross-correlation coefficient (CC) method used to quantify the demonstrate that the debonding damage of the CFRP plate-strengthened steel beam can effectively correlation between the impedance signatures and the debonding states. Results demonstrate that the debonding damage of the CFRP plate-strengthened steel beam can be effectively monitored by adopting the EMI-based method
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