内柱对框架—核心筒结构的抗震性能影响分析

发布时间：2018-05-20 07:27

本文选题：框架-核心筒结构 + 抗震性能　；参考：《西安科技大学》2017年硕士论文

【摘要】：框架-核心筒结构具有框架结构空间布置灵活与剪力墙抗侧刚度大的优势,使之成为现代高层建筑常用的结构形式。当外围框架柱与核心筒之间的距离比较大时,梁截面的高度和楼板的厚度必须增大,这样会降低有效层高,增加结构自重并且增大造价。因此当框架柱与核心筒之间的距离超过12米时,宜采取增设内柱的措施。本文以一栋30层的框架-核心筒结构模型作为研究对象,框架柱与核心筒之间的距离为12米,运用SAP2000建立了12个有限元分析模型,分别考虑内柱与核心筒之间距离变化、内柱截面尺寸变化和不同连接方式的的影响,进行了结构在水平地震作用下的弹性静力分析和塑性动力分析,研究了不同内柱布置方案对结构抗震性能的影响,对比得出增设内柱的框架-核心筒结构的最优方案,并为工程建设提出设计建议。研究结果表明,设置刚性连接框架内柱,可以提高结构的整体抗侧刚度;整体抗侧刚度的提高幅度随着内柱与核心筒间距的增大以及内柱截面尺寸的减小而减小。当内柱沿核心筒均匀对称布置时,对结构扭转性能影响不大。铰接内柱对结构整体的抗侧刚度和抗扭刚度的影响较小。在线弹性阶段,刚接内柱能分担外围框架柱承担的楼层剪力和核心筒的基底剪力,而铰接内柱对外围框架柱和核心筒的剪力影响都很小,反而增大了框架和核心筒之间连梁的弯矩。结构进入塑性阶段后,结构的变形和内力比线弹性阶段显著增大,内柱尺寸引起的变化幅度很小,且各模型之间的变化趋向一致;增设刚接内柱能更加充分的发挥材料的塑性机能。当设置的内柱尺寸比外框架柱的缩小100mm左右,内柱距核心筒外墙为3米左右时,结构各项受力性能更好,为最佳内柱布置方案。
[Abstract]:The frame-core tube structure has the advantages of flexible spatial arrangement of frame structure and large lateral stiffness of shear wall, which makes it a common structural form in modern high-rise buildings. When the distance between the outer frame column and the core tube is large, the height of the beam section and the thickness of the floor must be increased, which will reduce the effective floor height, increase the weight of the structure and increase the cost. Therefore, when the distance between frame column and core cylinder is more than 12 meters, the measures of adding inner column should be taken. In this paper, a 30-story frame-core tube structure model is taken as the research object. The distance between the frame column and the core tube is 12 meters. Using SAP2000, 12 finite element analysis models are established to consider the variation of the distance between the inner column and the core tube, respectively. In this paper, the elastic static analysis and plastic dynamic analysis of the structure under horizontal earthquake are carried out, and the influence of different inner column layout schemes on the seismic performance of the structure is studied. The optimum scheme of frame-core tube structure with inner column is obtained, and the design suggestions for engineering construction are put forward. The results show that the overall lateral stiffness of the structure can be improved by setting rigid connection frame columns, and the increasing amplitude of the overall lateral stiffness decreases with the increase of the distance between the inner column and the core cylinder and the decrease of the cross section size of the inner column. When the inner column is arranged symmetrically along the core tube, it has little effect on the torsional performance of the structure. The effect of hinged inner column on lateral stiffness and torsional stiffness of the whole structure is small. In the on-line elastic stage, the rigid inner column can share the floor shear force of the outer frame column and the base shear force of the core tube, while the hinge inner column has little effect on the external frame column and core tube shear force. On the contrary, the bending moment of the connecting beam between the frame and the core tube is increased. When the structure enters the plastic stage, the deformation and internal force of the structure increase significantly than that of the linear elastic stage, and the change of the size of the inner column is very small, and the variation of each model tends to be the same. The addition of rigid internal column can give full play to the plastic function of the material. When the size of the inner column is smaller than that of the outer frame column about 100mm, and the inner column is about 3 meters from the outer wall of the core cylinder, the mechanical performance of the structure is better, which is the best layout scheme of the inner column.
【学位授予单位】：西安科技大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU973.17;TU973.31

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