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冲切破坏是钢筋混凝土板柱结构的主要破坏形式。通过对ACI318-08、Eurocode 2、GB50010-2010等规范中关于板柱节点受冲切承载力计算公式的对比分析,发现对于板中配筋率的影响可否忽略以及影响程度等问题的考虑并不统一。为深入研究配筋率对板柱节点抗冲切性能的影响,在考虑材料和几何非线性的基础上,通过有限元软件OpenSEES对5个配筋率分别为0.5%(2个)、0.99%、2.0%及3.0%的板柱节点试件进行数值模拟和参数分析,对比分析各试件的承载力、刚度变化过程及破坏特征,发现模拟结果和试验结果吻合较好。研究表明:配筋率是进行板柱节点抗冲切设计不可忽略的影响因素,建议在规范修订中考虑此参数。最后还分析了其抗震性能及混凝土强度对抗冲切承载力的影响。
Punching failure is the main form of failure of reinforced concrete slab structure. Through the comparative analysis of the formulas of ACI318-08, Eurocode 2, GB50010-2010 and so on, the calculation formula of the punching load-bearing capacity of plate-and-column joints is found out that the influence on the reinforcement ratio in the plate can not be neglected and the consideration of the influence extent and so on Unite. In order to further study the effect of reinforcement ratio on the punching shear resistance of slab joints, the five reinforcement ratios of 0.5% (2) and 0.99% (2%) were respectively calculated by finite element software OpenSEES based on material and geometric nonlinearity. , 2.0% and 3.0% of the plate-column joints were analyzed by numerical simulation and parametric analysis. The bearing capacity, stiffness change process and failure characteristics of each specimen were compared and analyzed. The simulation results were in good agreement with the experimental results. The results show that the ratio of reinforcement is a factor that can not be neglected in the anti-punching design of plate-column joints. It is suggested that this parameter should be considered in the revision of the code. Finally, the impact of its seismic performance and concrete strength on the punching bearing capacity was also analyzed.