大跨不对称双塔连体结构抗震性能研究

发布时间：2018-02-25 20:24

本文关键词： 连体结构双塔动力特性抗震性能静力弹塑性　出处：《华中科技大学》2015年硕士论文　论文类型：学位论文

【摘要】：伴随着我国经济飞速发展,城市化进程不断加快,高层建筑需求旺盛。为了满足建筑大空间和城市地标等需求,连体结构近年来备受建筑师们亲睐。连体建筑虽然是在传统建筑形式上发展而来,但由于增加了连接体,尤其是背景工程这种双轴不对称结构形式,整体受力更加复杂,建筑间的影响变大,因此,研究是否布置连接体和连接体与塔楼连接方式对结构整体抗震性能的影响是迫切需要的。本文主要做了以下工作:1、完成结构在MIDAS/Gen中建模,并与背景工程原模型进行参数对比,保证模型的正确性。同时,增设六个算例,分析各算例动力特性。结果显示:由于塔楼结构布置不对称,且底盘刚度较大,因此各算例平扭耦联均比较严重,在双塔之间增设连接体会增加结构的不对称性,扭转效应加大,而采用刚接或铰接形式对结构动力特性几乎无影响,当引入铅芯橡胶支座后,周期得到延长,扭转效应相对减弱。2、运用振型分解法反应谱法(CQC)对各个算例进行性分析,分别从层剪力、侧移和层间位移角等方面分析是否布置连接体以及连接体连接方式对结构弹性抗震性能的影响。结果显示:连接体的存在会显著增大沿连接体方向的抗侧刚度,侧移减小,而层间剪力增大,其中刚接和铰接的情况幅度最大,弱连接次之,对垂直于连接体方向的影响相对较弱。3、选取两种荷载分布模式,共设8种工况对各个算例分别进行静力弹塑性计算,分析各个算例塑性铰发展和分布情况。结果显示:各算例的出铰顺序和位置比较相似,集中在底部核心筒区域及高塔连梁和剪力墙,但连接体的设置会导致塔楼与连接体相连楼层出铰加重,而铰接和弱连接减弱了对双塔的约束,反而使结构出铰更加明显。
[Abstract]:With the rapid development of China's economy, the process of urbanization is accelerating, and the demand for high-rise buildings is exuberant. In recent years, the contiguous structure has been favored by architects. Although the contiguous structure is developed in the traditional architectural form, but because of the addition of connectors, especially the biaxial asymmetric structure form of background engineering, the overall force is more complicated. Therefore, it is urgent to study whether to arrange the connection and the connection way between the tower and the connection on the seismic performance of the whole structure. This paper mainly do the following work: 1, finish the structure modeling in MIDAS/Gen. At the same time, six examples are added to analyze the dynamic characteristics of each example. The results show that the tower structure is asymmetric and the chassis stiffness is large. Therefore, the horizontal and torsional coupling of each example is quite serious, the connection between the two towers increases the asymmetry of the structure and the torsional effect increases, but the dynamic characteristics of the structure are almost unaffected by the rigid or hinged form, when the lead-rubber bearing is introduced, The period is prolonged and the torsional effect is relatively weakened. CQCmethod is used to analyze each case progressively, and the shear force is analyzed from the layer shear force. The effects of connection arrangement and connection mode on the elastic seismic performance of the structure are analyzed from the aspects of lateral displacement and interstory displacement angle. The results show that the existence of connection body can significantly increase the lateral stiffness along the direction of the connection and decrease the lateral displacement. However, the shear force between layers increases, in which rigid and hinged joints have the largest amplitude, followed by weak connections, and the effect on the direction perpendicular to the joints is relatively weak. The two load distribution modes are selected. The static elastoplastic calculation of each example is carried out under eight working conditions. The development and distribution of plastic hinge in each case are analyzed. The results show that the order and position of each example are similar. It is concentrated in the core tube area of the bottom and the tower connecting beam and shear wall, but the installation of the connecting body will lead to the increase of the outlet hinge of the tower connecting with the connecting body, while the hinge and weak connection weaken the constraint on the double tower, and make the structural outlet hinge more obvious.
【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】：TU973.31

【参考文献】