某L型高层框剪结构抗震性能分析

发布时间：2018-10-07 19:49

【摘要】：随着科技的进步,人们生活质量的提高,以及建筑场地的限制和建筑功能的要求,越来越多的不规则高层建筑涌现在人们的面前。在地震力作用下,不规则结构除了会产生水平位移之外还会发生扭转效应,因此,对不规则结构的抗震分析显得尤为重要。本文以一栋实际的L形不规则平面高层建筑为例,对该建筑结构的抗震性能进行分析与评估。首先,使用PKPM与MIDAS分别建立模型并对其进行小震下的静力弹性分析。其次,对计算结果的各项参数进行对比,结果表明它们均符合规范要求。再者,用MIDAS对整个结构进行了静力弹塑性分析(pushover),主要是对其层间位移角、性能点、塑性铰顺序进行分析,得出结构在罕遇地震作用下能达到“大震不倒”的要求。然后,为了找出不同的侧向力荷载分布模式对此类L形结构的影响,利用倒三角形、矩形、实时模式和CQC模式四种不同侧向力加载模式进行对比,结果发现实时模式与CQC模式计算结果曲线基本重合,误差很小；整个楼层中上部倒三角形荷载模式引起的内力最大,整个楼层下部矩形荷载模式引起内力最大。因此设计时建议采用这两种加载模式的包络值进行配筋设计。最后,对整个结构进行了弹性时程补充分析和薄弱层楼板应力分析,得出时程补充分析时地震波的选取是关键因素,楼板应力集中部位应采取加强措施。
[Abstract]:With the development of science and technology, the improvement of people's quality of life, the limitation of construction site and the requirement of building function, more and more irregular high-rise buildings appear in front of people. Under the action of seismic force, the torsional effect of irregular structures will occur in addition to horizontal displacement, so the seismic analysis of irregular structures is particularly important. Taking an actual L-shaped irregular plane high-rise building as an example, the seismic performance of the building structure is analyzed and evaluated in this paper. Firstly, PKPM and MIDAS are used to establish the model and analyze the static elasticity of the model under small earthquakes. Secondly, the parameters of the calculation results are compared, the results show that they all meet the specification requirements. Furthermore, the static elastic-plastic analysis of the whole structure is carried out by using MIDAS. The main purpose of (pushover), is to analyze the displacement angle, the performance point and the plastic hinge sequence of the whole structure. It is concluded that the structure can meet the requirement of "strong earthquake will not collapse" under the action of rare earthquake. Then, in order to find out the influence of different lateral load distribution modes on the L shape structure, four different lateral force loading modes, inverted triangle, rectangle, real time mode and CQC mode, are compared. The results show that the curve of real time mode and CQC model basically coincide with each other, and the error is very small, and the internal force caused by inverted triangle load mode in the upper part of the whole floor is the largest, and the internal force caused by the rectangular load mode in the whole floor is the largest. Therefore, the envelope value of these two loading modes is recommended for reinforcement design. Finally, the elastic time-history supplementary analysis and the weak floor stress analysis are carried out for the whole structure. It is concluded that the selection of seismic wave is the key factor in the time-history supplementary analysis, and the strengthening measures should be taken in the stress concentration part of the floor.
【学位授予单位】：广西大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：TU973.16;TU973.31

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