高层框剪结构不同楼梯结构形式的抗震性能分析与设计

发布时间：2018-09-18 16:47

【摘要】：楼梯是建筑物中联系楼层之间的交通构件,也是地震发生时人们紧急疏散逃离的主要通道。在汶川地震中,很多建筑物中的楼梯损坏特别严重,比如楼梯间的填充墙发生倒塌、楼梯间的角柱出现断裂以及楼梯的梯段板发生破坏等一系列震害现象。和纯框架结构中楼梯的剧烈破坏乃至断裂相比,框架剪力墙结构的楼梯出现的破坏程度明显减小,但是也不少见,不可忽视。保证人们生命财产安全是对建筑结构进行抗震设计的最主要目的,地震发生时楼梯应该作为建筑物中的“安全岛”,便于人们疏散逃离。本文通过Midas-gen创建了三个模型,分别为不建入楼梯构件但是施加楼梯荷载的无楼梯模型A、现浇整体板式楼梯模型B以及梯段板下端设置滑动支座的板式楼梯模型C。(1)利用Midas-gen对三个模型进行振型分解反应谱分析,研究三种模型的结构振型顺序、自振周期、地震作用下结构各层剪力、层间位移、构件内力等结构主要参数指标的异同,得到在对结构进行分析设计时,楼梯考虑为滑动支座楼梯时具有优越性。(2)利用Midas-gen对三个模型进行弹塑性时程分析,研究三种波作用下三种模型最大层间位移角、基底剪力以及顶层位移和加速度时程曲线峰值的差异,通过时程分析结果来进一步确定楼梯间最优设计方案,将楼梯间设计为框架一剪力墙一楼梯这样一个整体体系中的“安全岛”,评价整体结构抗震性能。(3)本文概述了滑动支座的构造,并通过分析结果总结了滑动支座楼梯对框架剪力墙结构抗震性能影响。本文通过对结构进行振型分解反应谱分析和弹塑性时程分析,根据分析结果可知,滑动支座楼梯与整体现浇板式楼梯以及无楼梯结构相比,由于梯段板下端设置了滑动支座,释放了部分支撑作用,滑动支座的存在使楼梯构件加入框架-剪力墙-楼梯这个整体体系,参与结构整体共同工作,但是不参与传递水平地震作用,能够防止它首当其冲的破坏,从而使楼梯间形成“安全岛”。本文旨在对高层框架剪力墙结构楼梯间抗震性能进行深入研究,为设计提供依据,并为以后的研究工作奠定理论基础。
[Abstract]:Stairs are the links between floors in buildings and the main passageway for people to evacuate when an earthquake occurs. During the Wenchuan earthquake, the stairs in many buildings were damaged seriously, such as the collapse of the filling wall of the staircase, the breakage of the corner columns of the staircase and the destruction of the staircase slab. The damage degree of stairs in frame-shear wall structure is much less than that of stairs in pure frame structure, but it is not uncommon and should not be neglected. In this paper, three models are created by Midas-gen, which are stainless model A without staircase component but with staircase load, cast-in-situ integral slab staircase model B and slab staircase model C with sliding support at the lower end of staircase plate. By analyzing the mode order, natural period, shear force, displacement between layers and internal force of members, it is concluded that the stairs are superior to sliding bearing stairs in structural analysis and design. (2) Midas-gen is applied to three models. Elastic-plastic time history analysis is carried out to study the maximum displacement angle between the three models, the difference of base shear force and the peak value of displacement and acceleration time history curve of the top story under the action of three waves. The optimal design scheme of stairwell is further determined by the time history analysis results, and the stairwell is designed as a whole system of frame-shear wall-stairway. (3) In this paper, the structure of sliding bearing is summarized, and the effect of sliding bearing stairs on the seismic performance of frame shear wall structure is summarized through the analysis results. In this paper, the response spectrum analysis and elastic-plastic time history analysis of the structure are carried out. According to the analysis results, the sliding bearing is known. Compared with the integral cast-in-situ staircase and stairway-free structure, the staircase member joins the frame-shear wall-staircase system and participates in the overall work of the structure, but does not participate in the transmission of horizontal seismic action, so it can prevent the earthquake. The purpose of this paper is to study the seismic behavior of staircases of high-rise frame-shear wall structure, to provide a basis for design and to lay a theoretical foundation for future research.
【学位授予单位】：山东建筑大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU973.31

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