非对称型钢骨—钢管混凝土组合柱力学性能研究

发布时间：2019-01-04 16:27

【摘要】：随着建筑结构向高耸、大跨、重载方向发展,柱子承受越来越大的荷载作用。近年来,钢骨-钢管混凝土组合柱由于其延性好、承载力高等优点而备受人们的关注。目前对这种组合柱的研究多集中在对称配钢上,考虑到柱子的不均匀受力状态、建筑平面布置和建筑成本控制等要求,根据边柱、角柱等特殊部位的受力情况,灵活配置型钢,改变钢骨截面形式,提出了内置T形、L形钢骨形式的钢骨-钢管混凝土组合柱,使其在满足构件受力性能的同时,可有效地节省材料,降低构件的造价。本文通过有限元软件ANSYS对非对称型钢骨-钢管混凝土组合柱的受力性能进行模拟,主要完成了以下工作:(1)在总结以往钢-混凝土组合柱受力性能试验和模拟分析的基础上,选择合适的材料本构关系及接触模型,建立了非对称型钢骨-钢管混凝土组合柱的有限元分析模型。(2)对非对称型钢骨-钢管混凝土组合短柱的轴压受力性能进行有限元模拟,分析其工作机理及承载能力,并讨论其承载力影响因素,最后根据模拟结果及理论分析给出非对称型钢骨-钢管混凝土轴压组合短柱承载力计算公式,公式值与模拟值吻合良好。(3)对非对称型钢骨-钢管混凝土轴压组合长柱的受力性能进行有限元模拟,分析其破坏形态及工作机理,总结不同因素对轴压长柱稳定性能的影响规律,基于回归分析建立了安全简化的轴压组合长柱承载力计算公式。(4)通过有限元模拟,对非对称型钢骨-钢管混凝土组合柱不同加载方向下的受弯力学性能进行研究,分析纯弯构件力学性能的影响因素,基于极限平衡理论及回归拟合给出了组合柱的抗弯承载力计算公式,且公式偏于安全。(5)通过有限元模拟,对非对称型钢骨-钢管混凝土组合柱的压弯力学性能进行研究,分析其工作机理,讨论偏压构件力学性能的影响因素,给出了典型构件沿不同加载方向下的N-M关系曲线,并对其布置方式提出合理建议。最后基于模拟结果,给出了内置T形钢骨形式的钢骨-钢管混凝土组合柱偏压承载力计算公式。
[Abstract]:With the development of high-rise, long-span and heavy-load buildings, the columns bear more and more loads. In recent years, steel-reinforced concrete filled steel tubular columns have attracted much attention because of their good ductility and high bearing capacity. At present, the research on this kind of composite column is mostly focused on symmetrical steel distribution. Considering the requirements of the non-uniform force state of the column, the layout of the building and the cost control of the building, according to the stress situation of the side column, the corner column and other special parts, the section steel can be configured flexibly. By changing the section form of steel bone, a steel steel-tubular concrete filled column with T-shaped and L-shaped steel bone is put forward, which can not only satisfy the mechanical properties of the members, but also save the material and reduce the cost of the members. In this paper, finite element software ANSYS is used to simulate the mechanical behavior of unsymmetrical steel-reinforced concrete filled steel tubular columns. The main works are as follows: (1) on the basis of summing up the previous tests and simulation analysis of the mechanical behavior of steel-concrete composite columns, the appropriate material constitutive relations and contact models are selected. The finite element analysis model of unsymmetrical steel-reinforced concrete filled steel tube composite column is established. (2) the axial compression behavior of asymmetric steel reinforced concrete filled steel tube composite column is simulated by finite element method, and its working mechanism and bearing capacity are analyzed. At last, according to the simulation results and theoretical analysis, a formula for calculating the bearing capacity of unsymmetrical steel-reinforced concrete filled steel tube composite short columns under axial compression is given. The formula values are in good agreement with the simulated values. (3) finite element simulation is carried out on the mechanical behavior of asymmetric steel-reinforced concrete filled steel tube composite columns under axial compression, and the failure mode and working mechanism are analyzed. This paper summarizes the influence of different factors on the stability performance of long columns under axial compression, and establishes a safe and simplified formula for calculating the bearing capacity of long columns under axial compression based on regression analysis. (4) by means of finite element simulation, The flexural mechanical properties of unsymmetrical steel-reinforced concrete filled steel tube composite columns under different loading directions were studied, and the influencing factors of mechanical properties of pure bending members were analyzed. Based on the limit equilibrium theory and regression fitting, the formula for calculating the flexural capacity of composite columns is given, and the formula is relatively safe. (5) through finite element simulation, the compressive and bending mechanical properties of composite columns with asymmetric steel-reinforced concrete filled steel tube are studied. The working mechanism is analyzed and the influencing factors of mechanical properties are discussed. The N-M relation curves of typical members along different loading directions are given and the reasonable suggestions for their layout are put forward. Finally, based on the simulation results, a formula for calculating the eccentric bearing capacity of steel-filled concrete filled steel tubular composite columns is given.
【学位授予单位】：南昌航空大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU398.9

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