钢纤维对钢筋混凝土梁弯曲韧性与疲劳损伤的影响

通过钢筋混凝土梁弯曲静载和等幅疲劳试验,研究了钢纤维对钢筋混凝土梁挠度、弯曲韧度、刚度以及刚度损伤累积的影响.结果表明:在弯曲静载试验中,梁的挠度随着钢纤维体积率的增加而逐渐减小,弯曲韧度逐渐增大;在疲劳试验中,各梁挠度增长和刚度损伤累积随着荷载循环次数增加均呈现三阶段变化规律,说明钢纤维掺入不会改变钢筋混凝土梁疲劳损伤发展规律,但会改变梁挠度和刚度的大小,随着纤维掺量增加,梁的挠度逐渐减小,刚度逐渐增加,抵抗变形能力增强.

Influence of Steel Fiber on the Flexural Toughness and Fatigue Damage of Reinforced Concrete Beam

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.