【作者】 陈曦；

【导师】 王湛；

【作者基本信息】 汕头大学 ， 结构工程， 2005， 硕士

【摘要】 随着钢管混凝土结构的广泛使用,钢管混凝土节点的设计问题也越来越受到关注。目前国内对钢管混凝土节点所作的研究,大多数都是针对具体形式的节点的承载力研究,很少探讨钢管混凝土节点的刚度问题。实际上,节点约束刚度对整体结构性能的影响是不容忽视的。本文作为国家自然基金课题《钢管混凝土框架节点约束刚度的研究》的一个子项,总结课题前期对于单个节点的研究成果,并在此基础上进而研究钢管混凝土框架节点的刚度及其对框架性能的影响。借助有限元分析软件ANSYS建立框架的实体模型并进行受力分析;进行2榀钢管混凝土框架实验,利用试验结果对有限元模型进行校核;在框架杆件分析中考虑连接柔性及结点刚性域,使分析结果比传统的结构力学简化模型更接近实际;在有限元节点模型中,改变节点细部尺寸,分析节点域各要素对连接性能的影响规律,建立包含各影响要素的通用的M-θ模型,可供实际工程的节点设计和框架分析参考;改变框架中的节点域要素,探讨了连接柔性及柔性程度不同对框架性能的影响。更多还原

【Abstract】 With wide use of CFT (concrete-filled tube) structure, more and more attentions have been paid to the design of CFT joints. There have been a great number of researches on CFT joints. But most of them focused on the ultimate resistance of certain joints. And the study on the stiffness of CFT joints has been seen seldom. As a matter of fact, the influence of joint’s stiffness on the whole structure can hardly been neglected. As a part of "The Study on the Restraining Stiffness of Joints of CFT frames", a project supported by National Natural Science Foundation of China, this paper have done further research on the stiffness of CFT joint in frame structure and its effect on the behavior of frame structure on the basis of the result of researches on the earlier stage of the project. The finite-element model of the CFT frame was analyzed in ANSYS. Two CFT frames were tested and the result was compared with the finite-element analysis for the verification for the model. The flexibility of connections and the rigid zone were considered in the member-bar model of the CFT frame. The comparison between the model of this paper and the traditional model showed the result of the former approached the test result more than the one of the latter. The geometric parameters of the finite-element model of joint were changed in a series of analysis of the isolated CFT joint in ANSYS in order to find out how the factors affect the performance of the connection. A general M — 0 formula of the connection was sum up to offer designers a reference for designing CFT joints and analyzing frames. The affecting factors of joint were changed in the analysis of the frame to find out how the flexibility of connections and the level of flexibility affect the behavior of the frame.更多还原