A Study on the Residual Fatigue Strain and Damage of Steel Fiber Reinforced Recycled Concrete Under Constant Amplitude Flexural Fatigue Loading

摘要

Flexural fatigue tests under constant amplitude fatigue loading were carried out in order to obtain the residual fatigue strain of two kinds of steel fiber reinforced concrete (SFRC): steel fiber reinforced recycled concrete (SFRRC) and steel fiber reinforced pebble concrete (SFRPC). The experimental results show that the residual fatigue strain of SFRC follows the three-stage law, and the residual fatigue strain of SFRRC develops more slowly than that of SFRPC at the same stress level. A residual fatigue strain equation is suggested. The fatigue damage of SFRC has also been studied. A fatigue damage evolution equation is proposed, and comparisons are made with other expressions, showing that the suggested model is in the best agreement with the experimental results.