FRCC连梁核心筒结构抗震数值模拟

发布时间：2018-06-05 01:09

本文选题：数值模拟 + 核心筒　；参考：《西安理工大学》2017年硕士论文

【摘要】：核心筒结构已在我国高层及超高层建筑结构中普遍运用。连梁基体采用纤维增强水泥基复合材料(FRCC)替代混凝土形成的FRCC连梁核心筒结构兼具了混凝土核心筒抗侧刚度大和FRCC塑性耗能能力强的优点,具有良好的承载力和耗能能力,能有效提高核心筒结构抗震性能。因此,对FRCC连梁核心筒的抗震性能展开深入研究至关重要。本文主要包括以下内容:(1)通过FRCC材性试验,得到其试验应力-应变曲线。结合试验曲线拟合出FRCC理论曲线。通过比较发现FRCC应力-应变理论曲线与试验曲线较为吻合,说明笔者推导的FRCC本构关系能够比较客观的反映该种材料的单轴受压和受拉性能。(2)运用有限元软件ABAQUS建立钢筋混凝土核心筒数值模型CW-1,对模型在低周反复荷载作用下的抗震性能进行有限元模拟计算,将模拟与试验结果进行对比。结果表明两者在骨架曲线、抗剪承载力、屈服位移、极限位移、延性和刚度退化曲线等方面基本一致,表明所建有限元模型有效。(3)将模型CW-1连梁基体由混凝土替换为同强度等级FRCC,建立FRCC连梁核心筒数值模型CH-1,进行数值计算。对比分析CH-1与CW-1滞回曲线、骨架曲线、刚度退化曲线和延性,结果表明FRCC连梁能有效提高核心筒耗能能力和延性,并能增大初始刚度,减缓刚度退化。(4)以CH-1模型为基础,对其进行变参数循环加载分析,分别研究了轴压比、核心筒高宽比、连梁跨高比、连梁配筋率及连梁面积配箍率对FRCC连梁核心筒结构抗震性能的影响。并在有限元分析的基础上,对FRCC连梁核心筒结构提出了相关的设计建议,并提供抗震设计意见。
[Abstract]:The core tube structure has been widely used in high-rise and super-high-rise buildings in our country. The FRCC core tube structure formed by replacing concrete with fiber reinforced cement matrix has the advantages of high lateral stiffness of concrete core tube and strong plastic energy dissipation capacity of FRCC, and has good bearing capacity and energy dissipation capacity. It can effectively improve the seismic performance of the core tube structure. Therefore, it is very important to study the seismic behavior of the core tube of FRCC beam. The main contents of this paper are as follows: (1) the stress-strain curve of FRCC is obtained through the experiment of its properties. The theoretical curve of FRCC is fitted according to the experimental curve. By comparison, it is found that the FRCC stress-strain theory curve is in good agreement with the experimental curve. It shows that the FRCC constitutive relation derived by the author can objectively reflect the uniaxial compressive and tensile properties of the material. (2) the numerical model CW-1 of the reinforced concrete core tube is established by using the finite element software ABAQUS, and the model is subjected to cyclic loading at low cycle. The seismic behavior of the system is simulated by finite element method. The simulation results are compared with the experimental results. The results show that the skeleton curves, shear bearing capacity, yield displacement, ultimate displacement, ductility and stiffness degradation curves are basically the same. It is shown that the finite element model is effective. The model CW-1 beam matrix is replaced by concrete with the same strength grade FRC. The numerical model CH-1 of FRCC connecting beam core tube is established and the numerical calculation is carried out. The hysteretic curves, skeleton curves, stiffness degradation curves and ductility of CH-1 and CW-1 are compared. The results show that the FRCC beam can effectively improve the energy dissipation and ductility of the core tube, increase the initial stiffness, and slow down the degradation of the stiffness. It is based on the CH-1 model. The effects of axial compression ratio, ratio of height to width of core tube, ratio of span to span of connecting beam, reinforcement ratio of connecting beam and hoop ratio of continuous beam area on seismic behavior of FRCC core tube structure are studied. On the basis of the finite element analysis, the paper puts forward some relevant design suggestions for the core tube structure of FRCC beam connecting beam, and provides some suggestions for seismic design.
【学位授予单位】：西安理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU973.17;TU973.31

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