Experimental Study on CFRP Bonded Anchorage Systems Under Combined Tension and Bending

Abstract:

Ten axial tensile tests and twelve combined tension and bending tests were conducted on the designed anchorage system specimens to investigate the mechanical properties of the carbon fiber reinforced polymer （CFRP）bonded anchorage system under combined tension and bending. Based on the optimization of the anchorage system， the ultimate bearing capacity， failure modes， anchorage efficiency， and CFRP tendon load-strain relationship of the specimens were studied with CFRP diameter and bending radius changes. The results indicate that the tensile strength reduction coefficient of the anchorage system decreases with the increase of CFRP tendon bending radius， and the larger the CFRP tendon diameter， the greater the reduction coefficient of specimen bearing capacity. The transverse constraint of CFRP tendons contributes to the improvement of tensile strength with bending. Additionally， the nonlinear variation of the load-strain curve of CFRP tendons is a typical characteristic before specimen failure； the ratio of bending radius to CFRP tendon diameter shows a linear relationship with the anchorage efficiency coefficient， and when the ratio is below 2.4‰， the anchorage efficiency coefficient of the specimen is less than 80%， exhibiting failure modes of non-uniform fracture and shear.

Key words:carbon fiber reinforced polymer(CFRP) bonded anchorage system;combined tension and bending test;tensile strength reduction coefficient;transverse constraint;anchorage efficiency;failure modes