钢管混凝土柱脚节点抗冲切计算分析

Calculation Analysis on Anti-punching-shear for Nodes of Concrete-f illed Steel Tube Column and Reinforced Concrete Foundation Beam

基于8个钢管混凝土柱脚节点在竖向荷载作用下的试验数据,采用理论分析与数据拟合的方法给出该类埋入式柱脚节点较为准确的抗冲切承载力计算公式;基于钢管混凝土柱脚节点在竖向荷载作用过程中表现出的典型特征,数值拟合了三折线结构受力模型,并与试验结果进行了对比。研究结果表明,由拟合的结构受力模型确定的曲线与试件的试验曲线吻合较好,直接反映了试件的受力破坏过程,可应用于钢管混凝土柱脚结构在竖向荷载作用下的非线性反应分析与设计计算。

Based on the test results of eight specimens under vertical load,which were nodes of concrete-filled steel tube（CFST） columns embedded in reinforced concrete（RC） foundation beams,the accurate anti-punching-shear calculating formula was given of the nodes by the method of theoretical analysis and data fitting.Based on the typical characteristics of specimens,the three-line mechanical model of the structure was fitted by numerical simulation,then compared with the experimental results.The results show that the curves determined by the presented three-line mechanical are good agreement with the experimental curves of the specimens,which clearly indicate the failure process.The presented model can be adopted to analyze nonlinear response and design calculation of the CFST column foot nodes under vertical load.