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钢管混凝土叠合柱环梁节点是一种连接叠合柱与钢筋混凝土梁的连接节点,其环梁受弯承载力计算方法有待研究。考虑管外混凝土的轴压作用,采取极限平衡法对环梁破坏隔离体受力分析,对现有钢管混凝土柱节点环梁受弯承载力计算方法进行了修正,使其更加适用于钢管混凝土叠合柱节点环梁,计算结果与静力试验结果对比显示,后者高约28%。根据试验结果研究对公式进行修正,采用ABAQUS有限元静力模型对不同轴压比下环梁的受弯承载力公式进行了验证,对比显示有限元分析结果略高于修正后的计算值,二者吻合较好。结果表明,考虑轴压力修正后的公式可以用于钢管混凝土叠合柱节点环梁受弯承载力的计算,公式计算结果偏于保守。
The CFST ring column girder joint is a kind of connecting node connecting the composite column with the RC girder, and the calculation method of flexural bearing capacity of the annular beam needs to be studied. Considering the axial compressive effect of concrete outside the tube, the ultimate balance method is adopted to analyze the mechanical behavior of the ring girder failure isolator. The calculation method of the flexural bearing capacity of the ring beam of the existing CFST columns is amended to make it more suitable for the CFST stack The ring beam of the composite column node, calculated results and static test results show that the latter is about 28% higher. Based on the experimental results, the formulas were revised and the ABAQUS finite element static model was used to verify the flexural capacity formulas of the ring beam under different axial compression ratios. The results show that the FEA results are slightly higher than the corrected values, The two agree well. The results show that the modified formula considering the axial pressure can be used to calculate the flexural capacity of the ring beam of CFST column joints. The formula is conservative.