钢管混凝土结构压弯节点试验研究与有限元分析-结构工程专业论文.docxVIP

摘要摘 摘要 摘 要 近年来，随着研究设计人员对钢管混凝土结构优越性的认识的深入和提高， 钢管混凝土结构在实际工程中的应用也越来越广泛。本文对应用较多的一种节 点型式外加强环式钢管混凝土节点进行了压弯静载性能试验分析和有限元分 析。本文所做的工作可归结如下： 1．试验的节点类型有两组，每组节点都有有内十字板和无内十字板的两个 试件模型，试验研究了节点的荷载一变形情况和受力状况。试验结果表明：钢 管混凝土节点部分具有较高的承载能力，第一组节点加做内十字板有利于提高 整体结构的抗弯能力，而第二组节点加做内十字板的作用尚不明显。 2．在理论分析部分，对第一组节点构件的承载力进行了公式分析，并同试 验情况进行了比较；对两组节点模型进行了有限元分析，分析了它们在节点区 的应力情况及荷载一变形关系曲线。有限元分析结果表明：有限元分析同试验 分析的变化曲线在线性阶段比较吻合；加做内十字扳均可提高两模型的承载能 力；影响钢管混凝土节点承载力的主要因素是节点区外的各连接部分；节点区 的薄弱环节发生在外加强环板及加劲板等部位。 本文以试验为基础，以理论分析为手段，为研究外加强环式钢管混凝土节 点构件的压弯承载性能提供了一定的依据。 关键词：钢管混凝土，外加强环式节点，试验研究，有限元分析，应力分布 AbstractAbstract Abstract Abstract In recent years，concrete·filled steel tubular(CFST)structures have been gradually adopted in high—rise buildings，and achieved a fast development,with the deeper and more extensive understanding of the advantages of them by the structural researchers and designers．In this thesis，static experiment and finite element analysis of compression and bending on connections between CFST column and steel beam with outer ring have been undertaken．Main research works as following are undertaken： 1．Two types of joints are tested，and each type includes two experimental models with and without inner cross plank．Curves of load-displacement and bearing capacity status are analyzed in tests．The experimental result indicates that： the bearing capacity of CFST connection is rather high；the inner cross planks are propitious to enhancing the bending capacity of the first type of joints，and the effect is not so apparent for the second type． 2．In the part of theoretical analysis，formular analysis of bearing capacity of connections are undertaken to the first type ofjoints，results ofwhich are compared to testing status．Finite element analysis is done to the two types of joints，and stress distribution and load-displacement curves are analyzed．The results of finite element analysis shows that：the bearing capacity of models with inner cross planks are highly increased；the bearing capacity of CFST connections are mainly a