【摘要】 复式钢管混凝土柱具有较高的抗压承载力,在强地震作用下具有很好的防倒塌能力,已广泛用于大跨度桥梁和超高层房屋建筑中。基于复式钢管混凝土柱-钢梁节点的试验研究,合理选择材料本构关系、破坏准则,采用ANSYS软件建立了有限元模型,以研究该类节点在低周往复荷载作用下的抗震力学性能。有限元模拟得到的滞回曲线及骨架曲线与试验结果吻合较好,从而验证了有限元模型的合理性。在此基础上,分析了钢梁及内外钢管在受力过程中的应力分布,探索了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参数分析,研究了钢梁强度等级、外方钢管柱强度等级、外方钢管柱壁厚及复式钢管混凝土柱轴压比对节点受力性能的影响,供此类新型节点的试验设计及工程应用参考。更多还原

【Abstract】 The composite concrete-filled steel tube(CFST) column has high compression-bearing capacity,and especially good anti-collapse behavior in strong earthquake,which has been widely used in large-span bridge and super high-rise buildings recently.According to the experimental study on composite concrete-filled steel tube column-steel beam connection,and based on reasonable selection of constitutive relationship of material and failure criteria,the finite element model(FEM) was built by the software ANSYS,the mechanical properties of the connetion were researched under the low cyclic loading.The simulated hysteretic curves and skeleton curves are in good agreement with the experimental data,which verified the reasonableness of the finite element model.Stress analysis was cnducted by using FEM to study the failure mode and force transmission mechanism of the new connection system.Moreover,parametric studies were carried out to investigate the influences of the intensity of steel beam and external square steel tube column,the wall thickness of external square steel tube column and axial compression ratio of the composite CFST tubes column on mechanical behavior of the connection.The results presented give a reference to test design and engineering application of the new type of connection.更多还原