钢纤维增强钢筋混凝土梁斜截面受剪承载力塑性极限分析

Shear Capacity Plastic Analysis of Steel Fiber Reinforced Concrete Beams with Reinforcement

根据试验研究结果以及钢纤维混凝土的应力应变关系特点,确定了钢筋、混凝土以及钢纤维混凝土的屈服条件,建立了钢纤维增强钢筋混凝土梁斜截面破坏模型,运用塑性分析方法推导出斜截面受剪承载力计算公式的塑性解,并提出塑性解中系数μ1和μ2的计算公式。计算结果表明,该塑性解考虑了钢纤维混凝土层厚、剪跨比和混凝土强度等主要影响因素,而且通过调整钢纤维混凝土层厚,使提出的塑性解的计算公式适用于普通钢筋混凝土梁、钢筋钢纤维增强部分混凝土梁和钢筋钢纤维增强全截面混凝土梁的斜截面承载力计算,且与试验结果符合较好。

Based on the experimental results and the characteristic of stress strain relationship of steel fiber reinforced concrete, the yield formulas of reinforced bar, concrete and steel fiber reinforced concrete were confirmed. Then the diagonal sectional failure mode of steel fiber reinforced concrete beams with reinforcement was established. With the plastic ultimate analysis, the plastic calculating formula and correspond coefficient μ1 and μ2 were researched. The calculating results indicate that by adjusting the thickness of steel fiber reinforced concrete, the plastic formula was adapt to the normal reinforced concrete beams, steel fiber reinforced partial concrete beams and steel fiber reinforced concrete beams. And fit the experimental data well, which is concerned with the thickness of steel fiber reinforced concrete, the shear span to effective depth retio and the concrete strength.