Fatigue Bond Performance And Life Predicition Method Of The Interface For FRP Tendon And Concrete

Due to it that high strength,light weight, non corrosion and anti fatigue resistance and other excellent performance of the Fiber Reinforced Polymer/Plastics(FRP),which is expected to become a potential alternative to traditional reinforced concrete structure under harsh natural environment. The interfacial bond performance is the key technical issues of FRP tendons and concrete with both the normal work.For static bonding performance between FRP tendons and concrete at home and abroad have made abundant achievements, but in view of the interface fatigue performance study is less. In order to improve the research results further, it is of important practical significance for the investigation on interface fatigue bonding performance between FRP tendons and concrete and the corresponding life prediction.An experimental study is conducted to investigate interface fatigue bonding performance between FRP tendons and concrete under the financial support of Natural Science Foundation of China. This dissertation involves mainly the following investigations and corresponding results:1. According to the experimental research on interface fatigue bonding performance between FRP tendons and concrete under constant amplitude fatigue load,achieced influence of load cycles, anchor length, the stress level and stress amplitude for bonded CFRP tendons anchorage assembly on load sliding curve and the the steel sleeve strain. Explored the cyclic loading effects on axial dynamic strain of CFRP tendons. Static load tensile test failure modes, ultimate bearing capacity, load sliding curve, CFRP reinforcement stiffness and steel sleeve and strain after cyclic loading are compared. Finally the fatigue life prediction curve and the calculation formula of critical anchorage length are achieved.2. Combined with highway bridges of random variable amplitude fatigue load spectrum, the interface fatigue bonding performance between FRP tendons and concrete under constant random load are researched. Achieced influence of loadcycles, anchor length for bonded CFRP tendons anchorage assembly on load sliding curve and the the steel sleeve strain. Explored the random loading effects on axial dynamic strain of CFRP tendons. Static load tensile test failure modes, ultimate bearing capacity, load sliding curve, CFRP reinforcement stiffness and steel sleeve and strain after random cyclic loading are compared. Finally the random fatigue life prediction curve and the calculation formula of critical anchorage length and fatigue damage evolution law are achieved.3.The interface fatigue bonding performance between FRP tendons and concrete are analysised by ANSYS.Studied on the influence of nchorage length, stress level and stress amplitude on anti-fatigue performance bond type anchorage assemblies.Test results validate the correctness of the theoretical analysis results.