圆钢管混凝土柱—蜂窝梁节点抗震性能研究

发布时间：2018-05-09 14:00

本文选题：钢管混凝土 + 蜂窝梁　；参考：《沈阳建筑大学》2014年硕士论文

【摘要】：钢管混凝土柱具有承载力高、塑性和韧性好、施工方便等优点,在工程中得到了越来越广泛的应用。蜂窝梁具有节省钢材、施工方便等优点,在工程和研究中也越来越受到重视。因此,如何将二者连接在一起,以及这种连接节点的力学性能如何,成为土木工程师十分关注的问题,而有关这方面的研究还十分少见。为此,本文深入研究了外加强环式圆钢管混凝土柱-蜂窝梁节点在低周往复荷载下的力学性能,从而为该种节点的实际工程应用和相关规范的制定提供理论依据,主要完成了以下工作。基于有限元软件ABAQUS,建立了外加强环式圆钢管混凝土柱-实腹钢梁节点的有限元模型,对其在低周往复荷载作用下的受力过程进行了有限元模拟分析,并利用已有的试验结果对模拟结果进行了检验,结果表明二者吻合较好,从而旁证了采用该种有限元模拟方法模拟圆钢管混凝土柱-蜂窝梁节点受力过程的可行性。并在此基础上,根据实际工程比例缩放建立了圆钢管混凝土柱-蜂窝梁和钢梁两个模型,通过对比两者在低周往复荷载作用下的滞回曲线、骨架曲线、延性系数及耗能能力,得到圆钢管混凝土柱-蜂窝梁节点具有良好的延性和耗能能力,更容易实现“强柱弱梁”的屈服机制,说明了外加强环圆钢管混凝土柱-蜂窝梁节点具有良好的工程应用价值。本文根据各参数不同设计了24个的外加强环式圆钢管混凝土柱-蜂窝梁节点,并采用上述有限元模拟方法,模拟了其受力过程,结果表明该种节点滞回曲线均比较饱满,没有明显的刚度退化,其位移延性系数在4.32-5.19之间,等效粘滞阻尼系数在0.31-0.36之间,说明整体构件具有良好的塑性能力,表现出该节点均具有良好的延性和抗震能力。采用以上模拟结果,分析了影响该种节点骨架曲线的因素,结果表明环板宽度、钢材强度、含钢率、梁柱线刚度比、开孔率、孔间距、梁上开孔中心到柱壁距离d是主要影响因素,而轴压比影响不明显。根据各参数对外加强环圆钢管混凝土柱-蜂窝梁节点骨架曲线得出弯矩-转角的影响规律,进一步分析了各参数对此节点抗弯承载力和初始刚度的影响规律,在此基础上回归得到了该种节点的抗弯承载力、极限抗弯承载力和初始刚度简化式,并验证了简化计算式的准确性,可供实际工程计算参考。
[Abstract]:Concrete-filled steel tubular columns (CFST) have been widely used in engineering because of their high bearing capacity, good ductility and toughness, easy construction and so on. Honeycomb beam has the advantages of saving steel and convenient construction, and has been paid more and more attention in engineering and research. Therefore, how to connect the two joints and how the mechanical properties of the joints are concerned by civil engineers has become a problem of great concern to civil engineers, but the research on this aspect is still very rare. Therefore, in this paper, the mechanical properties of externally reinforced circular concrete-filled steel tubular column-honeycomb beam joints under low cyclic reciprocating loads are studied in depth, which provides a theoretical basis for the practical engineering application of the joints and the formulation of relevant codes. Mainly completed the following work. Based on the finite element software Abaqus, the finite element model of externally reinforced circular concrete-filled steel tubular column-solid steel beam joints is established, and the finite element simulation analysis is carried out on the joints under low cyclic reciprocating loads. The simulation results are verified by the existing test results, and the results show that the two methods are in good agreement with each other, which proves the feasibility of using this finite element simulation method to simulate the stress process of circular concrete-filled steel tubular column-honeycomb beam joints. On this basis, two models of circular concrete-filled steel tubular column-honeycomb beam and steel beam are established according to the scale scaling of practical engineering. The hysteretic curve, skeleton curve, ductility coefficient and energy dissipation capacity of the two models under low cycle reciprocating load are compared. The results show that the concrete-filled steel tubular column-honeycomb beam joints have good ductility and energy dissipation ability, and it is easier to realize the yield mechanism of "strong column and weak beam", which shows that the externally strengthened circular concrete-filled steel tubular column-honeycomb beam joints have good engineering application value. In this paper, 24 externally reinforced circular concrete-filled steel tubular column-honeycomb beam joints are designed according to different parameters. The results show that the hysteretic curves of the joints are full, and the above finite element simulation method is used to simulate the stress process of the joints. The displacement ductility coefficient is between 4.32-5.19 and the equivalent viscous damping coefficient is between 0.31-0.36, which shows that the integral member has good plasticity and good ductility and seismic resistance. By using the above simulation results, the factors affecting the skeleton curve of the joint are analyzed. The results show that the width of the ring plate, the strength of steel, the steel content, Liang Zhu's linear stiffness ratio, the opening ratio, the spacing between holes, The distance from the center of the upper hole to the column wall d is the main factor, but the axial compression ratio is not obvious. According to the skeleton curve of reinforced circular concrete-filled steel tubular column (CFST) column and honeycomb beam, the effect of moment angle on the bending bearing capacity and initial stiffness of the joint is further analyzed. On this basis, the simplified formulas of flexural bearing capacity, ultimate flexural capacity and initial stiffness of the joint are obtained by regression, and the accuracy of the simplified formula is verified, which can be used as a reference for practical engineering calculation.
【学位授予单位】：沈阳建筑大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TU352.11;TU398.9

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