某超高层建筑结构抗震性能和抗震措施研究

发布时间：2018-01-05 14:38

本文关键词：某超高层建筑结构抗震性能和抗震措施研究　出处：《清华大学》2015年硕士论文　论文类型：学位论文

【摘要】：近年来超高层建筑在我国发展得越来越迅速,尤其是500 m以上的超高层建筑在我国各地不断涌现。我国是地震高发区,对于结构设计人员而言,需要准确把握超高层建筑的抗震性能,提出合理的抗震措施。本文以某在建超高层建筑为例,研究了其在设防大震下及极罕遇地震下的抗震性能,并对结构设计中的难点问题进行了探讨,提出了改善建筑结构抗震性能的设计建议。具体工作内容包括:(1)基于大型通用有限元程序,建立了背景工程的计算模型,并完成了设防大震下的弹塑性分析和极罕遇地震下的抗倒塌分析。分析结果表明,该工程各项指标均能满足性能化设计需求,并能实现“小震不坏,大震不倒”的设计目标,具备一定程度的抗倒塌安全储备。结构中上部为变形较大部位,同时也是结构倒塌的主要危险部位。(2)提出三种最小地震剪力系数的控制方法,并分别设计了三个结构,比较了不同设计模型的抗震性能和抗倒塌性能。研究表明,采用现行规范规定的刚度控制方法来满足最小地震剪力系数的规定,所设计的结构材料用量过大,结构构件承载力利用率较低,而其抗震性能和抗倒塌性能却比其他两个采用强度控制方法的结构提高有限。故针对此结构,宜采用基于强度的最小地震剪力系数控制办法满足最小地震剪力系数的规定。(3)建立了两种剪力墙内支撑布置方案的分析模型,比较了两模型的材料用量,抗震性能和抗倒塌性能。分析结果表明,结构中上部剪力墙内布置钢支撑所增加的用钢量较小,但能够较好地提升结构在大震下的抗倒塌性能,为类似超高层建筑结构抗震设计提供参考。(4)对背景工程的双连梁布置方案进行了分析和比较,并完善了现有计算程序的壳单元能量计算和输出方法,从耗能角度比较了不同连梁布置方案对整体结构抗震性能的影响,为背景工程的连梁设计提出优化建议。
[Abstract]:In recent years, super-tall buildings are developing more and more rapidly in our country, especially the super-tall buildings above 500m are emerging all over our country. China is a high earthquake area, for structural designers. It is necessary to accurately grasp the seismic performance of super tall buildings and put forward reasonable seismic measures. This paper takes a building under construction as an example to study its seismic performance under fortification and rare earthquakes. The difficult problems in the structural design are discussed, and the design suggestions for improving the seismic performance of the building structure are put forward. The specific work includes: 1) based on the large-scale universal finite element program. The calculation model of background engineering is established, and the elastic-plastic analysis under fortification and the anti-collapse analysis under rare earthquake are completed. The analysis results show that each index of the project can meet the requirements of performance-based design. It can realize the design goal of "small earthquake is not bad, big earthquake can not fall", and has a certain degree of anti-collapse safety reserve, and the upper part of the structure is a large deformation part. At the same time, it is also the main dangerous part of the collapse of the structure.) three kinds of control methods of minimum seismic shear coefficient are proposed and three structures are designed respectively. The aseismic performance and collapse resistance of different design models are compared. The results show that the structural materials used in the design are too large by using the stiffness control method stipulated in the current code to meet the minimum seismic shear coefficient. The efficiency of carrying capacity of structural members is low, but its seismic performance and anti-collapse performance are limited compared with the other two structures using strength control method. The control method of minimum seismic shear coefficient based on strength is suitable to meet the minimum seismic shear coefficient.) the analysis models of two kinds of bracing schemes in shear wall are established and the material consumption of the two models is compared. The results show that the increase of steel bracing in the middle and upper shear wall is small, but it can improve the collapse resistance of the structure under the strong earthquake. It provides reference for seismic design of super high-rise building structure. It also analyzes and compares the arrangement of double connected beam in background engineering, and consummates the energy calculation and output method of shell element of existing calculation program. From the point of view of energy consumption, the effects of different arrangement schemes of connecting beams on the seismic performance of the whole structure are compared, and the optimization suggestions for the design of connected beams in the background engineering are put forward.
【学位授予单位】：清华大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TU973.31

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