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冲剪研究对钢筋混凝土平板和柱连接之间承载能力的评估以及核电厂中安全壳的安全计算和安全评估有重要意义。先前研究都忽略了跨深比对冲剪强度的影响,且现有设计准则中所用的方程量纲不一致,故大大限制了其使用范围和精度。给出了一个新的无量纲公式,考虑了钢筋数量、钢筋间距和跨深比的影响,可用于预测钢筋混凝土平板在冲头作用下的冲剪强度。结果表明,新方程与已有实验结果吻合得很好,且优于现有设计准则。
The research of punching shear is important for the assessment of bearing capacity between reinforced concrete slab and column connections and for the safety calculation and safety assessment of containment in nuclear power plants. Previous studies have ignored the impact of the cross-over hedge shear strength, and the dimensions of the equations used in the existing design guidelines are inconsistent, which greatly limits the scope of its use and accuracy. A new dimensionless formula is given, taking into account the influence of the number of rebar, spacing of rebars and the ratio of depth to span, which can be used to predict the punching shear strength of reinforced concrete slab under the punch action. The results show that the new equation is in good agreement with the existing experimental results and is superior to the existing design criteria.