错位转换高层建筑结构水平地震作用下的扭转反应研究
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摘要
根据中国规范设计了一总层数为40层的错位转换高层建筑结构,为对比分析需要另设计具有相同楼层数的两带单层转换高层建筑结构。采用Etabs和Satwe对比分析了三结构在水平地震作用下的相对位移比、层间位移比沿楼层分布情况;其相对扭转角、层间扭转角、层间有害扭转角的分布特点;顶层角点扭转位移轨迹。研究分析表明,错位转换高层结构的扭转反应远大于同类带单层转换高层结构的反应;对单层转换结构采用位移比不能很好反映其扭转反应,而结构扭转位移角沿楼层分布规律更能体现其扭转反应特征。
A 40-story high-rise building with stagger transfer structure has been designed according to Chinese Code,two other high-rise buildings with one transfer story have also been designed in need of comparison.The Etabs and Satwe programs are used.The ratio between the maximum displacement and the mean one in each story,and the ratio between the maximum story drift and the mean one in each story of the abovementioned three models are analyzed and compared.The relative torsional angle,the interstory torsional angle and the harmful interstory torsional angle are compared.The displacement track of the point at the corner of the top story is also analyzed.The research results show that the torsional response of the high-rise building with stagger transfer structure is greater than that of the high-rise building with one transfer story;the ratio of displacement can't reflect the torsional response characteristic of this kind of structure,the interstory torsional angle is better than the ratio of displacement in reflecting that of this kind of structure.
A 40-story high-rise building with stagger transfer structure has been designed according to Chinese Code,two other high-rise buildings with one transfer story have also been designed in need of comparison.The Etabs and Satwe programs are used.The ratio between the maximum displacement and the mean one in each story,and the ratio between the maximum story drift and the mean one in each story of the abovementioned three models are analyzed and compared.The relative torsional angle,the interstory torsional angle and the harmful interstory torsional angle are compared.The displacement track of the point at the corner of the top story is also analyzed.The research results show that the torsional response of the high-rise building with stagger transfer structure is greater than that of the high-rise building with one transfer story;the ratio of displacement can't reflect the torsional response characteristic of this kind of structure,the interstory torsional angle is better than the ratio of displacement in reflecting that of this kind of structure.
引文
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[2]Semih S Tezcan,Cenk Alhan.Parametric analysis of irregular structures under seismic loading according to the newTurkish Earthquake Code[J].Engineering Structures,2001,23(6):600-609.
[3]Ramos J I.Torsional oscillations in symmetrical structures[J].Applied Mathematical Modelling,1984,8(6):433-441.
[4]Chandler A M,Hutchinson G L.Tosional coupling effects in the earthquake response of asymmetric buildings[J].Engineering Structures,1986,8(4):222-236.
[5]Pekau O A,Guimond R.Accidental torsion in yielding symmetric structures[J].Engineering Structures,1990,12(2):98-105.
[6]Jeong Seong-Hoon,Elnashai Amr S.Fragility relationships for torsionally-imbalanced buildings using three-dimensional damage characterization[J].Engineering Structures,2007,29(9):2172-2182.
[7]JGJ 3-2002 J 186-2002,高层建筑混凝土结构技术规程[S].北京:中国建筑工业出版社,2002.
[8]魏琏,王森.扭转不规则建筑竖向构件考虑扭矩影响的抗震验算方法[J].建筑结构,2006,36(7):8-10.
[9]徐培福,王军却,郝锐坤,等.转换层设置高度对框支剪力墙结构抗震性能的影响[J].建筑结构,2000,30(1):37-43.
[10]郭仕群.使用偏心支撑减小不规则高层建筑的扭转振动效应[J].地震工程与工程振动,2005,25(3):76-80.
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