T形钢管混凝土柱抗震性能非线性有限元分析

发布时间：2018-07-10 16:14

本文选题：T形钢管混凝土柱 + 抗震性能　；参考：《武汉理工大学》2013年硕士论文

【摘要】：异形钢管混凝土柱不仅具有普通钢管混凝土柱的优越性能,而且拥有自身的优点,能够更好地满足建筑的平面布置要求和建筑使用功能,其在未来的建筑结构中的发展前景必将越来越广阔。本文基于黄俊博士对异形钢管混凝土组合柱试验研究及抗震性能研究课题的基础上进行深化研究,主要采用ABAQUS对T形截面异形钢管混凝土柱的抗震性能进行了有限元模拟分析,主要研究内容和研究成果如下： (1)T形钢管混凝土柱有限元模型建立：利用有限元分析软件ABAQUS建立T形钢管混凝土柱有限元模型,其中,钢管与混凝土的界面模型均采用不考虑粘结滑移方式来模拟。 (2)T形钢管混凝土柱抗震性能有限元分析：有限元计算所得的荷载—位移滞回曲线形状均很饱满,没有出现捏缩现象,滞回性能良好,说明T形钢管混凝土柱的延性和耗能性能都很好；T形钢管混凝土柱位移延性系数均大于2,说明T形钢管混凝土柱的延性性能优于普通混凝土构件；T形钢管混凝土柱的等效粘滞阻尼系数h。均大于0.3,说明T形钢管混凝土柱的耗能能力优于普通钢筋混凝土结构和型钢混凝土结构；T形钢管混凝土柱的刚度退化曲线基本上呈现标准正态分布,随着位移的不断增加,钢管对核心混凝土产生套箍作用,T形钢管混凝土柱的刚度退化趋势明显变慢,表明T形钢管混凝土柱本身具有较强的抗侧移能力。 (3)T形钢管混凝土柱有限元计算结果正交分析：采用正交分析法对T形钢管混凝土柱有限元计算结果进行分析,主要考察肢高厚比、钢管厚度、钢管强度等级、混凝土强度等级、轴压比、荷载角和柱长度7个因素对T形钢管混凝土柱的极限承载力、延性系数和等效粘滞阻尼系数的影响,得到了各因素对构件极限承载力、延性和耗能性能影响的显著程度：肢高比对T形钢管混凝土柱极限承载力影响最大；混凝土强度等级对T形钢管混凝土柱延性系数影响最大；钢管强度等级对T形钢管混凝土柱等效粘滞阻尼系数影响最大。 (4)T形钢管混凝土柱骨架曲线模型探讨：通过对有限元计算结果进行回归分析,提出了T形钢管混凝土柱荷载-位移骨架曲线模型,充分考虑了轴压比、套箍系数、长细比对骨架曲线的影响推导了模型参数(弹性阶段刚度、屈服荷载、强化阶段刚度)计算表达式,并引入修正系数η对弹性阶段刚度进行修正,最后将模型计算结果与有限元计算结果进行了对比：弹性阶段刚度有限元计算值偏大,经修正误差控制在一定范围内；轴压比、套箍系数、长细比对屈服荷载和强化阶段刚度影响较大；模型计算结果与有限元计算结果吻合较好,该模型参数计算表达式具有一定的计算精度和应用价值,可为后续研究提供参考。
[Abstract]:The special-shaped concrete-filled steel tubular column not only has the superior performance of the ordinary concrete-filled steel tubular column, but also has its own advantages, which can better meet the requirements of the plane layout of the building and the function of the building. Its development prospect in the future construction structure will be more and more broad. Based on Dr. Huang Jun's research on the experimental research and seismic behavior of concrete-filled steel tubular columns, Abaqus is used to simulate the seismic behavior of concrete-filled steel tubular columns with T-shaped section by finite element method. The main research contents and results are as follows: (1) the finite element model of T-shaped concrete-filled steel tubular column is established by using finite element analysis software Abaqus. The interface model of steel tube and concrete is simulated without considering the bond-slip mode. (2) finite element analysis of seismic behavior of T-shaped concrete-filled steel tubular column: the load-displacement hysteretic curve obtained by finite element analysis is very full. There is no pinch phenomenon, and the hysteretic performance is good, which indicates that the ductility and energy dissipation performance of T-shaped CFST columns are very good. The displacement ductility coefficient of T-shaped concrete-filled steel tubular columns is more than 2, which indicates that the ductility of T-shaped concrete-filled steel tubular columns is better than that of ordinary concrete members. The results show that the energy dissipation capacity of T-shaped concrete-filled steel tubular columns is better than that of ordinary reinforced concrete structures and steel reinforced concrete structures. The stiffness degradation curves of T-shaped concrete-filled steel tubular columns basically show a standard normal distribution, and with the increasing of displacement, the stiffness degradation curves of T-shaped concrete-filled steel tubular columns show a standard normal distribution. The stiffness degradation trend of T-shaped concrete-filled steel tube columns is obviously slower than that of T-shaped concrete filled steel tube columns. The results show that T-shaped concrete-filled steel tubular columns have strong ability to resist lateral displacement. (3) the results of finite element analysis of T-shaped concrete-filled steel tubular columns are analyzed by means of orthogonal analysis. The effects of seven factors, such as height ratio, steel tube thickness, steel tube strength grade, concrete strength grade, axial compression ratio, load angle and column length, on the ultimate bearing capacity, ductility coefficient and equivalent viscous damping coefficient of T-shaped CFST columns are investigated. The effects of various factors on ultimate bearing capacity, ductility and energy dissipation performance of T-shaped concrete-filled steel tubular columns are obtained: limb height ratio has the greatest influence on ultimate bearing capacity of T-shaped concrete-filled steel tubular columns, and concrete strength grade has the greatest influence on ductility coefficient of T-shaped concrete-filled steel tubular columns. The strength grade of steel tube has the greatest influence on the equivalent viscous damping coefficient of T-shaped concrete-filled steel tubular column. (4) the model of skeleton curve of T-shaped concrete-filled steel tubular column is discussed: the results of finite element analysis are analyzed by regression analysis. The load-displacement skeleton curve model of T-shaped concrete-filled steel tubular column is proposed. The influence of axial compression ratio, hoop coefficient and aspect ratio on the skeleton curve is fully considered. The model parameters (elastic stage stiffness, yield load) are derived. The stiffness of the elastic stage is modified by introducing the modified coefficient 畏. Finally, the results of the model calculation are compared with the results of the finite element method: the finite element calculation value of the stiffness in the elastic stage is larger than that of the finite element method. The corrected error is controlled within a certain range; axial compression ratio, hoop coefficient, aspect ratio have great influence on yield load and stiffness in strengthening stage, and the results of model calculation are in good agreement with the results of finite element calculation. The model parameter calculation expression has certain calculation precision and application value, and can provide reference for further research.
【学位授予单位】：武汉理工大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：TU398.9;TU352.11

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