关键词: 钢筋混凝土;钢纤维;挠度;弯曲韧性;刚度

Abstract: The change of the deflection,bending toughness and stiffness of reinforced concrete beam was studied by bending static load and constant amplitude fatigue test.The results show that as the steel fiber volume ratio increase,the deflection of beam decreases,and the bending toughness increase under static load test.According to constant amplitude fatigue test, stiffness degeneration of beams and the damage accumulation all conform to three-stage development rules.Which shows that the steel fiber incorporation can not change the development of fatigue damage of reinforced concrete beams, but it will change the deflection and rigidity of the beam.With the increase of the fiber content, the deflection of the beam decreases gradually and the stiffness gradually increased.And enhanced the ability to resist deformation.

Key words: reinforced concrete;steel fiber;deflection;bending stiffness;toughness