加强层对型钢砼框—筒结构抗震性能的影响研究

发布时间：2018-06-09 01:22

本文选题：框一筒结构 + 梁式加强层　；参考：《华中科技大学》2015年硕士论文

【摘要】：根据近年来高层建筑的设计经验及理论分析研究[1],在框架-核心筒中,当侧向刚度过小时,可在设备层和避难层的中,设置合适刚度的伸臂构件,可以此加强框架与核心筒的连接,控制侧移量,使其顶点位移在侧向力作用下达到限值要求。结合现有资料分析,实梁形式的加强层在高层建筑中的应用较广泛,但会导致内力较大的突变,不利于框一筒结构的抗震,为了使结构具有较好的抗震性能,对加强层相关设置参数进一步深入研究具有重要意义。本文以一幢48层的型钢混凝土框架一钢筋混凝土核心筒高层结构为算例,分别采用七种不同水平加强层设置方案,并使用SATWE和ETABS有限元分析软件分别进行建模分析与计算。通过对带两种不同的加强层形式(桁架加强层与刚性加强层)和加强层数量(沿层高均匀布置一道、两道或三道桁架加强层)的模型方案进行弹性时程分析计算与振型分解反应谱法分析,研究相应结构体系的周期、位移、位移角及内力等,根据计算结果进行了对比分析,探讨了在风荷载和水平地震作用等侧向力作用下,如何减小由于水平加强层刚度过大而使结构产生内力突变过大的不利影响。论文的研究得出的主要结论为:选择适当形式和有限刚度的加强层对框架-核心筒高层结构在风荷载作用下结构侧移的控制,对风荷载和水平地震作用下结构内力突变的控制均具有良好的效果。
[Abstract]:According to the design experience and theoretical analysis of high-rise buildings in recent years [1], in the frame-core tube, when the lateral direction is just passing an hour, it can be installed in the equipment layer and the sheltered floor, the extension arm members with suitable stiffness can be set up. The connection between the frame and the core tube can be strengthened, and the lateral displacement can be controlled so that the peak displacement can reach the limit value under the action of lateral force. According to the analysis of the existing data, the reinforced story in the form of real beam is widely used in the high-rise building, but it will lead to the abrupt change of the internal force, which is not conducive to the seismic resistance of the frame-tube structure, in order to make the structure have better seismic performance. It is of great significance to further study the related setting parameters of the strengthening layer. In this paper, a 48-story steel reinforced concrete frame-reinforced concrete core-tube high-rise structure is taken as an example. Seven different levels of strengthening layer are adopted, and the modeling analysis and calculation are carried out by using SATWE and ETABS finite element analysis software respectively. By comparing two different types of stiffeners (truss stiffeners and rigid stiffeners) and the number of stiffeners (arranged uniformly along the height of the layer), The model of two or three truss stiffeners) is analyzed by elastic time-history analysis and mode decomposition response spectrum method. The period, displacement angle and internal force of the corresponding structure system are studied, and the results are compared and analyzed according to the calculation results. Under the action of wind load and lateral force such as horizontal earthquake, how to reduce the adverse effect of the sudden change of internal force on the structure due to the large stiffness of the horizontal strengthened story. The main conclusions of this paper are as follows: selecting the appropriate form and finite stiffness of the strengthened story to control the lateral displacement of the frame-core tube high-rise structure under the wind load. It has good effect on controlling the sudden change of internal force under wind load and horizontal earthquake.
【学位授予单位】：华中科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TU973.17

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