考虑粘结滑移作用的钢筋混凝土梁柱节点数值分析

发布时间：2018-06-14 22:33

本文选题：钢筋混凝土节点 + 反复荷载　；参考：《深圳大学》2013年硕士论文

【摘要】：钢筋混凝土框架结构梁柱节点是现代建筑结构中最重要的组成部分之一。近几年，，很多相关的研究都提出了改善钢筋混凝土梁柱节点抗震性能的建议。但是由于反复荷载下钢筋混凝土梁柱节点的受力复杂并且对很多因素反应敏感，因此要精确分析地震荷载下节点的力学性能是相当复杂的。研究表明节点的破坏过程与混凝土材料、钢筋材料及钢筋与混凝土间粘结滑移作用的非线性特点有很大关系。本文主要研究了这些关键因素对地震荷载作用下的钢筋混凝土梁柱节点有限元模拟分析的影响。本文首先建立了一个反复荷载作用下的圆形柱模型进行ABAQUS混凝土损伤塑性（CDP）模型的参数研究，并给出了一些采用CDP模型进行有限元分析的建议。此外，本文还提出了一种简单有效的方法用于定义CDP模型中的损伤变量。除混凝土材料模型外，要更准确地分析节点的力学性能还需要建立合适的粘结滑移模型。本文介绍了几种经典的粘结滑移模型，并以此为基础提出了一种适用于在ABAQUS中进行钢筋混凝土梁柱节点分析的粘结滑移模型。利用ABAQUS用户单元子程序（UEL）的架构，本文开发了用于实现这种模型的粘结单元。通过对比钢筋拉拔试验和柱反复加载试验的模拟与试验结果，粘结单元的可靠性得以验证。本文还在CDP模型参数研究的基础上建立了反复荷载作用下的十字形性梁柱节点模型。选用了合理参数的CDP模型在节点模型中同样表现良好，各项宏观分析结果均与试验结果较为吻合。与不考虑粘结滑移的模型相比，插入粘结单元的模型的计算结果表现得与试验结果更为接近。本文的研究表明混凝土模型和粘结滑移模型在对反复荷载作用下钢筋混凝土结构力学性能的分析计算中扮演着重要角色。CDP模型和粘结滑移单元在ABAQUS中的共同应用为反复荷载作用下的RC梁柱节点的数值分析提供了一种有效方法。
[Abstract]:Reinforced concrete frame structure Liang Zhu joint is one of the most important components of modern building structure. In recent years, many related studies have put forward some suggestions to improve the seismic behavior of reinforced concrete Liang Zhu joints. However, the mechanical properties of reinforced concrete Liang Zhu joints under seismic loading are very complicated because of their complexity and sensitivity to many factors. It is shown that the failure process of the joints is closely related to the nonlinear characteristics of the bond-slip interaction between the concrete material, the reinforced material and the steel bar and concrete. In this paper, the influence of these key factors on the finite element analysis of reinforced concrete Liang Zhu joints under earthquake load is studied. In this paper, a circular column model under repeated load is first established to study the parameters of Abaqus concrete damage plastic (CDP) model, and some suggestions for finite element analysis with CDP model are given. In addition, a simple and effective method is proposed to define the damage variables in CDP model. In addition to the concrete material model, it is necessary to establish an appropriate bond-slip model to analyze the mechanical properties of the joints more accurately. In this paper, several classical bond-slip models are introduced, and a bond-slip model suitable for the analysis of reinforced concrete Liang Zhu joints in Abaqus is proposed. Based on Abaqus user unit subroutine (UELL), a bonding unit is developed to implement this model. The reliability of the bonding unit is verified by comparing the simulation and test results of steel bar drawing test and column repeated loading test. Based on the study of the parameters of the CDP model, the cross-shaped Liang Zhu node model under repeated load is established in this paper. The CDP model with reasonable parameters also performs well in the node model. The results of macroscopical analysis are in good agreement with the experimental results. Compared with the model without the consideration of bond-slip, the calculated results of the model inserted into the bonding unit are more similar to the experimental results. The research in this paper shows that the concrete model and the bond-slip model play an important role in the analysis and calculation of the mechanical properties of reinforced concrete structures under repeated loads. CDP model and bond-slip element are used in Abaqus. This paper provides an effective method for numerical analysis of RC Liang Zhu joints under repeated loads.
【学位授予单位】：深圳大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：TU375

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