【作者】 叶武；

【导师】 周天华；

【作者基本信息】 长安大学 ， 结构工程， 2007， 硕士

【摘要】 本文在总结国内外关于钢管混凝土框架节点研究的基础上,根据本课题组前期已有试验和理论研究成果,设计了一组“带内隔板的方钢管混凝土柱-削弱梁端的钢与混凝土组合梁框架节点”试件;采用通用有限元程序ANSYS,对上述节点进行了三维建模,并模拟分析了节点在单调和低周反复荷载作用下的受力性能;有限元模型中,钢材采用Von.Mises屈服条件和运动强化本构关系,混凝土采用William-Warnke五参数破坏准则和弹塑性本构关系;通过计算,得到了“框架节点”的荷载-位移曲线、节点区的应力和应变分布规律及破坏情况;考察了轴压比大小对节点受力性能的影响。研究发现,本文“框架节点”均表现出较好的延性及耗能性能;混凝土楼板的组合作用可以适当提高节点的刚度和承载力,且对削弱梁端节点区的应力和应变分布影响较小;节点的承载力和延性随着柱顶轴压力的增大而逐渐下降。根据有限元模拟分析得到的滞回曲线,提出了“框架节点”的恢复力模型曲线,骨架曲线采用简化四折线或五折线模型,滞回曲线采用简化三折线模型,简化曲线与有限元计算曲线对比,吻合较好,且形式简单。当为8度设防Ⅲ、Ⅳ类场地和9度设防时,本文“框架节点”可以作为框架结构梁柱刚性连接时采用的新型连接方式。最后,对节点连接的抗弯和抗剪承载力计算提出了设计建议。更多还原

【Abstract】 Based on the investigation of concrete-filled tubular column to steel beam connections in China and abroad,a serial of "concrete-filled square tubular column with internal diaphragms to composite steel-concrete beams with reduced beam Section connections " are designed. These connections are based on the experiment and theoretical results which from our workgroup. With the finite element analyze software ANSYS, the 3D modles according to the connections are founded. The mechnical behavior of connections under the monotonic loading and cyclic loading are analyzed.The Von. Mises failure criterion and multiplier kinematical hardening stress-strain relationships have been used for steel and the William-Warnke failure criterion and elastic-plastic stress-strain relationships used for concrete. Through computation, Load-Displacement curves, stress or strain distribution, distruction situation of the joints are get. The factor of changing axial compression force ratio of the influence of joints capacity behavior is also analyzed. From the results,the joints in the paper display a better ductility and energy dissipation capacity. If the concrete floor is considered,the stiffness and the load capacity of the joints increase properly, and the influence of the stress-strain distribution in the joints are small.The loading capacity and ductility is falling gradually as the axial compression force increasing.Mathmatical modle are derived to simulate the hysteresis behavior of the connections. Simple four or five polygonal line modle are used for substituting the skeleton curve, and simple three polygonal line modle for the hysteresis behavior curve. Simple curve and finite compution curve are compared and better anastomotic.The joints can be used as new form of beam-to-coloumn rigid connections in the nine intensity or III and IV site of eight intensity.At last,the design suggestion of the bending and shearing resistance computation are put forward.更多还原