纵筋配筋率对无腹筋钢筋混凝土梁受剪性能的影响研究

Research on the Effect of Various Longitudinal Reinforcement Ratios on the Shear Behavior of Reinforced Concrete Beams Without Web Reinforcement

为研究纵筋配筋率在集中荷载作用下对无腹筋钢筋混凝土简支梁受剪性能的影响,收集整理了719根发生剪切破坏的无腹筋钢筋混凝土细长梁的试验数据来进行分析,并探讨了我国规范GB50010—2010《混凝土结构设计规范》(2015年版)中的计算公式在反映纵筋配筋率对受剪承载力的影响方面的效果。分析结果表明,纵筋配筋率对无腹筋混凝土简支梁受剪承载力影响显著,尤其在纵筋配筋率较小时,但不同剪跨比下影响有较大差异。《混凝土结构设计规范》在预测较小纵筋配筋率下无腹筋混凝土构件受剪承载力时,偏于不安全。

In order to study the influence of longitudinal reinforcement ratio on the shear behavior of reinforced concrete beams without web reinforcement under concentrated load, the shear test data of 719 slender beams without web reinforcement subjected to shear failure were collected and analyzed, and the effect of calculation formula of GB 50010—2010 Code for Design of Concrete Structures in reflecting the influence of reinforcement ratio of longitudinal bars on shear capacity is also discussed,. The results show that: the ratio of longitudinal reinforcement has a significant effect on the shear capacity of simple supported concrete beams without web reinforcement, especially when the ratio of longitudinal reinforcement is small, but the influence is quite different under different shear span ratio. The Code for Design of Concrete Structures exhibit unsafe in predicting the shear capacity of concrete members without web reinforcement, especially, under small longitudinal reinforcement ratio.