A new-type intelligent monitoring anchor system for CFRP strand wires based on CFRP self-sensing

Abstract In order to explore the feasibility of the structural health monitoring on the in-service anchor system for carbon fiber-reinforced polymer (CFRP) strand wires, the relative theoretical analysis and experimental tests were conducted. The piezoresistive model for CFRP strand wires was established by theoretical deduction. The damage model of the anchor system at different load stages of the anchorage zone was established by theoretical derivation. Thereby, the regional distribution monitoring methodology of the anchor system was established based on the above two models. The tensile experiments on the anchor system for the CFRP strand wires were carried out, and the typical mechanical and electrical features were ascertained, including volt–ampere characteristics, resistance–strain relationship, strain sensitivity, and the distribution of shear and tensile stresses along the anchorage zone. The results show the theoretical results are in line with the experimental measurements, with a maximum error of below 15%. This indicates excellent applicability and reliability of self-monitoring on the anchoring systems throughout loading.