带加强层高层建筑结构地震作用的简化算法
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摘要
采用振型分解反应谱法计算带加强层的高层、超高层建筑的地震作用时,通常需要考虑高阶振型的影响,于此类周期比较长、高阶振型影响显著的结构,往往需要考虑较多的振型,计算过程较为复杂。通过对带加强层高层建筑结构在侧向荷载作用下的受力和变形特点进行分析发现带加强层高层建筑结构在侧向荷载作用下内筒及外柱等构件的变形及内力在加强层处发生突变,加强层刚度较大时,类似于在加强层处给结构增加了一个"整体转动嵌固",整体转动嵌固近乎将结构从加强层处分为单独几部分。本文根据带加强层高层建筑的结构特点,提出一种计算其地震作用的简化方法,通过考虑较少的振型即可得到相对于振型分解反应谱法较为精确的结果。此法是结构初步设计中一种有效的计算地震作用的方法。
According to the mode superposition response spectrum method,calculating the earthquake action on high-rise structure with strengthened stories needs to consider the contributions of many modes.When subjected to lateral loads,the internal force and deformation change radically near the strengthened stories,and the strengthened stories are similar to an "integral rotation constraint" for the structure above them.If the stiffness of outriggers is larger enough,they nearly divide the structure into several independent parts.Based on this feature,a simplified method for calculating earthquake action on structure with strengthened stories is proposed in this paper,which is applicable in preliminary design of structures.
According to the mode superposition response spectrum method,calculating the earthquake action on high-rise structure with strengthened stories needs to consider the contributions of many modes.When subjected to lateral loads,the internal force and deformation change radically near the strengthened stories,and the strengthened stories are similar to an "integral rotation constraint" for the structure above them.If the stiffness of outriggers is larger enough,they nearly divide the structure into several independent parts.Based on this feature,a simplified method for calculating earthquake action on structure with strengthened stories is proposed in this paper,which is applicable in preliminary design of structures.
引文
[1]GB50011-2001建筑抗震设计规范[S].北京:中国建筑工业出版社,2001.
[2]Stafford Smith B,Salim I.Parameter study of outrigger braced tall building structures[J].Journal of Structural Engineering,1981,107(T10):2001-2014.
[3]杨克家,梁兴文,张茂雨.带加强层超高层建筑结构基于能力谱法的抗震设计[J].地震工程与工程振动,2010,30(1)::84-92.
[4]余安东.用水平加强层控制高层结构的侧移[J].建筑结构学报,1988,9(6):30-38.
[5]徐培福,黄吉锋,肖从真,等.带加强层的框架-核心筒结构抗震设计中的几个问题[J].建筑结构学报,1999,20(4):2-10.
[6]梁兴文,黄雅婕,杨其伟.钢筋混凝土框架结构基于位移的抗震设计方法研究[J].土木工程学报,2005,38(9):53-61.
[7]Anil K.Chopra,Rakesh K.Goel.Amodal pushover analysis procedure for estimating seismic demands for buildings[J].Earthquake Engineer-ing and Structural Dynamics,2002,31(3):561-582.
[8]蒋利学,胡绍隆.钢筋混凝土超高层建筑层间位移的模型试验研究[J].建筑结构,2001,31(1):3-6.
[2]Stafford Smith B,Salim I.Parameter study of outrigger braced tall building structures[J].Journal of Structural Engineering,1981,107(T10):2001-2014.
[3]杨克家,梁兴文,张茂雨.带加强层超高层建筑结构基于能力谱法的抗震设计[J].地震工程与工程振动,2010,30(1)::84-92.
[4]余安东.用水平加强层控制高层结构的侧移[J].建筑结构学报,1988,9(6):30-38.
[5]徐培福,黄吉锋,肖从真,等.带加强层的框架-核心筒结构抗震设计中的几个问题[J].建筑结构学报,1999,20(4):2-10.
[6]梁兴文,黄雅婕,杨其伟.钢筋混凝土框架结构基于位移的抗震设计方法研究[J].土木工程学报,2005,38(9):53-61.
[7]Anil K.Chopra,Rakesh K.Goel.Amodal pushover analysis procedure for estimating seismic demands for buildings[J].Earthquake Engineer-ing and Structural Dynamics,2002,31(3):561-582.
[8]蒋利学,胡绍隆.钢筋混凝土超高层建筑层间位移的模型试验研究[J].建筑结构,2001,31(1):3-6.
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