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基于复式钢管混凝土外钢管不连通环梁节点的试验研究,在合理选择材料本构关系和破坏准则的基础上,采用有限元分析软件ANSYS建立模型,研究了该类节点在往复荷载作用下的力学性能。有限元模拟的滞回曲线及骨架曲线与试验结果大致吻合,在一定程度上验证了有限元方法的合理性。在此基础上,分析了钢筋混凝土环梁及内外钢管的应力分布,探索此类节点的传力机制及最终破坏形态。最后对该类节点进行了参数分析,研究节点处竖筋配筋率、竖筋锚固长度、节点核心区及环梁处混凝土强度等级、框架梁混凝土强度等级对骨架曲线的影响规律。
Based on the experimental research on the ring-beam joint outside the pipe of CFST with discontinuous connection, the constitutive relation and failure criterion of the material are reasonably selected, and the finite element analysis software ANSYS is used to establish the model. The mechanics of the joint under cyclic load is studied. performance. The hysteresis curve and the skeleton curve of the finite element simulation are roughly consistent with the experimental results, to a certain extent, verify the rationality of the finite element method. On this basis, the stress distribution of the annular steel beams and the steel pipes inside and outside the RC beams are analyzed, and the force transmission mechanism and the final failure mode of such joints are explored. Finally, the parameters of such nodes are analyzed. The influence of the vertical reinforcement ratio, the vertical reinforcement anchorage length, the core region and the strength of the concrete at the annular beam and the strength of the frame beam on the skeleton curve are studied.