高强钢筋混凝土梁的抗剪能力

Shear Capacity of Reinforced High-Strength Concrete Beams

本文列出了２２根高强钢筋混凝土梁的抗剪能力实验结果，并把实验结果与ＡＣＩ３１８—８３的公式（１），ＧＢＪ１０—８９的公式（２）及清华大学实验得到的抗剪承载力计算公式（３）、（４）的计算值进行比较．得出结论，当ａ／ｄ较大而相对ρ较低的高强混凝土无腹筋梁，公式（１）、（３）偏于不安全，但当ρ不是太低时，公式（３）能较好地估算高强混凝土无腹筋梁的抗剪能力，（１）、（３）式均能满足高强砼梁抗剪强度的要求。对于配有箍筋的高强砼梁，公式（１）满足梁的抗剪要求且偏于保守．公式（２）和（４）当ａ／ｄ较大，ｒｆｙｖ相对较低时是不安全的，但当ａ／ｄ较大，ρ和ｒｆｙｖ不是太低时，两公式均能较好地估算高强混凝土梁的抗剪能力．

The paper shows experiment results of the shear Capacity of 22 reinforced high-stregth concrete beams,and measured results are compared with computing values using the shearcapacity equation (1)of ACI318 - 83,shear-capacity equation (2) of GBJ10- 89 Code and equations (3).(4) by Qing Hua University showed. For beams without web steel with highstrength Concrete, larger shear span-depth ratio (a/d)and relatively lower amount of longitudinal steel content (ρ),equation (1) and (3) over estimate shear strength and are not safe;but when longitudinal steel content is larger,equation (1) and (3) can all satisfy the needs of shear capacity of beams. For reinforced high-strength Concrete beams with web steel,equation (1) of ACI318 - 83 Building Code satisfy the needs of shear capacity of beams and is more Conservative. For reinforced high - strength concrete beams with larger a/d. lower rfyv,the equations (2) and (4) are not safe; but when a/d is larger,ρand rfyv are not too low,equations (2),(4) can fairly estimate shear capacity of reinforced high - strength concrete beams.