Fatigue Performance of Concrete with Pre-Cracks in Tension-Compression Cycles

摘要

A tension-compression cycle fatigue test was performed in order to study the fatigue property of C50 concrete with pre-cracks in cyclic loading. The stress ratio was ﹣1 and the amplitude was 0.2 MPa ～ 1.30 MPa. The results show that the modified coefficient of fatigue strength is 0.198 ～0.265 and the infinite life fatigue strength is below 0.45MPa. While the log value of fatigue life is approximately linear with the amplitude of fatigue load stress, the discreteness of fatigue life, the particularity of concrete, has little to do with the amplitude. The S-N, P-N fatigue life curves and the constant fatigue life diagram of pre-crack concrete are obtained.