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在刚塑性冲切计算模型的基础上,采用二次抛物线形库仑-莫尔混凝土强度准则,运用虚功原理,建立考虑混凝土板中抗弯钢筋销栓作用的冲切承载力计算式。根据已有板冲切试验研究成果,如冲切角和破坏时刻抗弯钢筋应力等数据,对板冲切承载力计算式进行简化,给出简化计算式。与国内外混凝土板冲切试验数据进行计算比较后发现,简化计算式的计算结果较好地符合实测承载力;抗弯钢筋的销栓作用约占钢筋混凝土板总冲切承载力的6%～11%,而忽略抗弯钢筋的销栓作用会给计算结果带来较大影响。
Based on the rigid plastic punching calculation model, the formula of punching shear capacity considering the effect of the bending steel bar pin in concrete slab was established by using the strength principle of quadratic parabola Coulomb Mohr concrete. According to the existing research results of blanking test, such as punching angle and moment of bending steel, the calculation formula of blanking capacity is simplified and the simplified formula is given. Compared with the punching shear test data of concrete slabs both at home and abroad, it is found that the calculation results of the simplified calculation formula are in good agreement with the actual bearing capacity. The pinning effect of flexural reinforcement accounts for about 6% 11%, while neglecting the pinning effect of flexural reinforcement will have a greater impact on the calculation results.