钢纤维混凝土梁抗剪强度截面分析方法

Sectional analysis approach for shear strength of steel fiber reinforced concrete beams

在修正压力场理论和钢纤维混凝土梁受弯理论的基础上建立了钢纤维混凝土梁抗剪强度的截面分析方法,考虑了钢纤维混凝土梁裂缝处的局部应力控制条件.通过对采用3条不同钢纤维混凝土受拉应力-应变曲线的计算结果与试验结果比较,建议了考虑受拉强化效应的受拉应力-应变曲线.此外讨论了计算模型中裂缝局部控制条件对抗剪强度计算结果的影响.对44根剪跨比大于2.0的钢纤维混凝土梁进行了分析,分析结果与试验值吻合很好.

Based on modified compression field theory and bending theory of steel fiber reinforced concrete（SFRC） beams,a sectional analysis approach for predicting shear strength of SFRC beams with local stress check at cracks is presented.A tensile stress-strain curve considering tensionstiffening effect is suggested based on the comparative study of the predicted shear strength obtained by three tensile stress-strain curves of SFRC with experimental results.Moreover,the effect of local stress check at cracks on the predicted shear strength is discussed.44 fiber reinforced concrete beams with shear-to-span ratios more than 2.0 subjected to shear are analyzed and a good correlation between predicted shear strength and experimental results is achieved.