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从结构体系可靠度的角度认识钢筋混凝土板柱结构的抗连续倒塌性能,用Monte-Carlo连续成组抽样方法对以节点冲切破坏为主的板柱结构连续倒塌进行可靠度分析。在建立板柱节点功能函数的基础上,推演了抗冲切承载力分布及荷载基本变量分布和荷载效应组合的方法。通过计算初始条件下任意一个板柱节点失效的概率和一个节点失效条件下其他节点失效的条件概率,分析了不同位置板柱节点在抗连续倒塌中的重要性以及板柱结构的抗连续倒塌鲁棒性指标。结果表明:底层中柱节点冲切失效最容易引起其他节点的连续性破坏及倒塌,按我国规范设定了柱顶贯通受压钢筋的板柱结构鲁棒性指标比较高。
From the perspective of structural system reliability, the anti-continuous collapse behavior of reinforced concrete slab-column structure was recognized. The reliability analysis of continuous collapse of slab column structure with node punching failure was carried out by Monte-Carlo continuous group sampling method. Based on the establishment of the function of slab-column nodes, a method of combination of load-shedding shear strength distribution and load basic variables distribution and load effect is deduced. By calculating the probability of failure of any one slab node under initial conditions and the conditional probability of failure of other nodes under one node failure condition, the importance of slab nodes at different positions in anti-continuous collapse and the anti-continuous collapse of slab columns are analyzed Sticky indicators. The results show that the punching failure of the bottom column joints is the most likely to cause the continuity damage and collapse of other joints. The robustness index of column-column structure with column top through compressive reinforcement is set according to China’s code.