基于修正压力场理论的超高性能钢纤维混凝土柱抗剪承载力

为了分析超高性能钢纤维混凝土柱抗剪性能,基于修正压力场理论提出了柱子抗剪承载力计算模型.该模型通过柱端部截面中心正应变来考虑轴力和弯矩对抗剪承载力的影响,通过关键参数混凝土主压应变与主压应力间的角度和平均正应变来反映剪跨比、轴力以及配箍率对柱抗剪承载力的影响.结果表明:对剪跨比为1.5~2.0的柱子,该模型剪力计算值与试验值吻合良好.

Shear Capacity of Ultra-high Performance Steel Fiber Reinforced Concrete Columns Based on Modified Compression Field Theory

In order to analyze the shear behavior of ultra high performance fiber reinforced concrete ( UHPSFRC) column, the authors propose a shear capacity calculation model based on the modified compression field theory. This model considers the interaction of axis and shear force through the center axis strain of the column' s end section. The key parameters of concrete compressive strain angle and the average longitudinal strain reflect the impact of shear span ratio, axial force, and stirrup ratio to shear capacity of column. The results show that the predicted value in the shear capacity model agrees well with the tested results when the shear span ration is from 1. 5 to 2. 0 .