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高温后钢管钢骨混凝土组合柱力学性能研究

发布时间:2019-04-16 00:17  文章来源:笔耕文化传播
【摘要】:随着建筑物向着高层化、大规模化以及多功能化发展,建筑火灾成为人们面临的一种发生频率较高的灾害。在一栋建筑物中,柱子是主要的受力构件,决定着该建筑的安全性能。钢管钢骨混凝土组合柱作为一种新型构件,相对于普通混凝土柱和钢管混凝土柱有着较好的力学性能。但目前,对其力学性能的研究大都处于常温下的研究,其高温后力学性能的研究较少,因此限制了该组合结构的应用与推广。 本文利用ABAQUS有限元软件,对钢管钢骨混凝土组合柱构件进行了以下研究: (1)在以往的研究基础上,进行了轴压短柱常温下和高温后的承载力模拟分析,并推导出高温后轴压短柱极限承载力计算的简化公式,并对计算值和模拟值进行对比,二者吻合较好。 (2)通过选取偏心距、加载方向、以及温度为主要参数,研究了构件的偏压力学性能,并根据其不同受力阶段的应力云图对其受力机理进行分析,结果显示:强轴加载时的承载力要高于弱轴加载时的承载力。组合柱的偏压承载力除了与强弱轴有关系外,还与偏心距的大小有着关系,当偏心距较小时,强轴比弱轴承载力提高的多,当偏心距较大时,强轴比弱轴的承载力提高的少。并在轴压公式的基础上通过引入偏心率折减系数和紧箍效应系数来验证模拟的高温后的极限承载力,验证结果表明模拟结果与计算结果吻合较好。 (3)选取不同长细比的组合构件,以长细比、配骨指标和温度为主要参数对其稳定承载力进行分析,结果显示:构件的承载力随着长细比的增大而减小,配骨指标的增大可以提高组合柱的延性。温度的升高,会导致组合柱承载力的降低。并建立了高温后组合柱的轴压稳定承载力计算公式和偏压稳定承载力计算公式,计算结果与模拟结果吻合良好。
[Abstract]:With the development of building towards high-level, large-scale and multi-function, building fire has become a high frequency disaster. In a building, the pillar is the main force component, which determines the safety performance of the building. Steel-reinforced concrete-filled steel tubular columns, as a new type of member, have better mechanical properties than ordinary concrete-filled steel tube columns and concrete-filled steel tube columns. But at present, the research on the mechanical properties of the composite structure is mostly at room temperature, and the study of its mechanical properties after high temperature is less. Therefore, the application and popularization of the composite structure are limited. In this paper, the ABAQUS finite element software is used to study the steel tubular steel reinforced concrete composite columns as follows: (1) on the basis of previous research, the bearing capacity of short columns under axial compression at room temperature and after high temperature is simulated and analyzed. A simplified formula for calculating the ultimate bearing capacity of short columns under axial compression after high temperature is derived, and the calculated values are compared with the simulated values, which are in good agreement with each other. (2) by selecting the eccentricity, loading direction and temperature as the main parameters, the mechanical properties of the component under bias pressure are studied, and the mechanical mechanism of the component is analyzed according to the stress cloud diagram of the different stress stages. The results show that the bearing capacity of strong axial loading is higher than that of weak axial loading. The bearing capacity of composite columns is not only related to the strong and weak axes, but also to the size of eccentricity. When the eccentricity is small, the load capacity of the strong axis is increased more than that of the weak bearing, and when the eccentricity is large, the bearing capacity of the strong shaft is less than that of the weak axis. On the basis of axial compression formula, the ultimate bearing capacity after high temperature is verified by introducing eccentricity reduction coefficient and tightening effect coefficient. The results show that the simulation results are in good agreement with the calculated results. (3) the stability bearing capacity of composite member with different slenderness ratio is analyzed by taking the slenderness ratio, bone matching index and temperature as the main parameters. The results show that the bearing capacity of the composite member decreases with the increase of the slenderness ratio, and the stability bearing capacity of the composite member decreases with the increase of slenderness ratio. The ductility of composite columns can be improved with the increase of bone matching index. The increase of temperature will lead to the decrease of bearing capacity of composite columns. The calculation formulas of axial compression stability bearing capacity and bias pressure stability bearing capacity of composite columns after high temperature are established. The calculated results are in good agreement with the simulation results.
【学位授予单位】:沈阳大学
【学位级别】:硕士
【学位授予年份】:2013
【分类号】:TU398.9

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