EXPERIMENTAL RESEARCH ON SHEAR FATIGUE PERFORMANCE OF CFRP-STRENGTHENED HIGH-STRENGTH CONCRETE STRUCTURE

The shear resistance at the interface between FRP sheet and concrete is a key problem for the application of fiber-reinforced plastic (FRP)plates, which has emerged as a popular method for the strengthening of reinforced concrete structures. The objective of this study is to discuss the interfacial shear fatigue behavior of a high-strength concrete structure strengthened by carbon fiber-reinforced polymer composites under repeated loads. Considering the different strength of concretes, double-shear fatigue tests were conducted. Based on the test results, the effects of the concrete strength, the failure process, the failure mode and the failure mechanism are investigated. Test results indicate that fatigue failure mode is brittle failure in the concrete layer and fatigue life increases as the strength of concrete decreases.