Failure mechanisms governing anchoring force of friction-based wedge anchorage for prestressed CFRP plate

摘要

An efficient anchorage system is demanded for the Carbon Fiber Reinforced Polymer (CFRP) plates with various sizes in structure reinforcements. The short-term governing failure modes were studied experimentally and numerically in determining the anchoring force of friction-based wedge anchorages to fulfill for all failure criteria for different variables, including the barrel and wedge thickness, length of wedge corner cut, roughness of contact surface, and the pretension load. A series of anchorages were investigated using pull-off tests to obtain the maximum anchoring force and the sequence of failure modes. The anchorage behavior was then simulated by three-dimensional numerical models to attain the maximum anchoring force for each performance criterion under varying conditions. Both the sliding and interlaminar debonding, rather than the tensile rupture, were found to determine the maximum anchoring force of a compact anchorage in the specific range of the parameter values involved. The wide and thin CFRP plate in the anchorage zone was prone to interlaminar debonding and the narrow and thick one tended to sliding or rupture. The parametric studies demonstrated that the CFRP size, the friction coefficient, and the bolt pretension load have significant influences on the maximum anchoring force of the friction-based anchorages.