基于桁架-拱模型的钢筋混凝土短柱抗剪承载力尺寸效应分析

为了研究钢筋混凝土柱抗剪承载力尺寸效应,对6个不同截面尺寸的钢筋混凝土短柱进行单调和低周反复加载试验.试验结果表明:钢筋混凝土柱抗剪承载力的安全储备系数随截面尺寸的增大而降低.采用桁架-拱模型理论,分析了钢筋混凝土短柱的受剪机理,认为抗剪承载力的尺寸效应是由混凝土引起的,提出了考虑截面尺寸影响系数的钢筋混凝土柱抗剪承载力实用计算公式,研究表明:采用考虑截面尺寸效应的抗剪承载力计算式得到的大小构件安全储备系数趋于一致.

Size Effect Analysis on Shear Behavior of Reinforced Concrete Short Columns Based on Truss-arch Model

Six reinforced concrete short columns under low cycle reversed loading and monotonic horizontal loading were tested to investigate the size effect on shear behavior of columns. The analysis results show that the safe coefficient of shear-bearing capacity decrease as section size increase. The theory of truss-arch model was applied to the analysis of the shear mechanism of reinforced concrete short columns,then it was concluded that the size effect of shear-bearing capacity is generated by concrete,and a practical calculation model of shear-bearing capacity of reinforced concrete column considering section size effect coefficient was proposed. The results indicate that the safety coefficient of large size specimen is consistent with results of small size specimen when the section size effect is considered.