资料简介： A fiber-based distributed plasticity finite element formulation is presented to perform three-dimensional monotonic analysis of square or rectangular concrete-filled steel tube (CFT) beam-col-umns. This stiffness-based beam-column element fomulation accounts comprehensively for all significant geometric nonlinearity exhibited by CFT beam-columns as part of composite frame struc-tures, and the steel and concrete constitutive models account for the significant inelastic phenomena which are seen in CFT experi-ments. In addition, the finite element formulation accounts for slip between the steel and concrete components of the CFT by incor-poration of a nonlinear slip interface. This formulation is able to capture behavior ranging from perfect bond to immediate slip. The calibration and verification of the slip formulation are presented,and the finite element model is verified against experiments of CFT beam-columns subjected to monotonic loading. Results from a pre-liminary study are presented on the effect of slip on CFT beam-column and composite frame behavior. A related paper extends this formulation to cyclic analysis of composite CFT frames, and provides details of the steel and concrete constitutive models.
Keywords: concrete-filled steel tube, distributed plasticity finite element, bond, slip
层布式纤维钢管混凝土梁柱层间塑性剪切模型
摘 要
利用塑性有限元公式对正方形或者矩形层布式纤维钢筋混凝土(钢管)梁柱进行三维分析。对具有框架结构的钢管混凝土梁柱进行实验，实验验证了混凝土与钢材的本构模型的非弹性特征。此外,利用塑性有限元公式还可以解决钢管混凝土中钢与混凝土之间的非线性滑动界面的问题，同时，公式还可以清楚地解释混凝土与钢之间的滑移问题。通过对梁柱进行单向加载实验，实验结果验证并校核有限元模型。初步研究结果证明了滑移对钢管混凝土节点和复合框架的影响。在反复荷载作用下，实验对钢筋混凝土框架进行了研究分析并提供了相关的钢筋混凝土本构模型。已有的文献完善了复合钢管混凝土框架循环分析法，并提供了该模型的本构关系的详细资料。
关键词:钢筋混凝土，塑性有限分布，元素,连接，滑移
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