带加强层高层建筑直接基于位移的抗震设计(Ⅰ)——方法理论
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摘要
带加强层高层、超高层建筑结构日益增多,针对此类结构提出合理的抗震设计方法十分必要。根据模态理论考虑高阶振型对结构反应的贡献,基于较成熟的多层结构直接基于位移的抗震设计理论,提出了带加强层高层建筑结构直接基于位移的抗震设计方法。方法根据模态理论将结构各个振型分别等效为单自由度体系,计算各单自由度体系的地震响应,进而以振型参与系数为权重进行加权叠加,得到结构地震作用下的总响应,以此考虑高阶振型影响。结合带加强层高层建筑结构受力特点,选取较易发生破坏的楼层作为关键楼层,关键楼层的性能反映整个结构的性能,以此对方法进行了调整和简化,减少了计算工作量。方法思路清晰、符合结构实际、应用相对简便,可供实际工程设计参考。
High rise structures with strengthened stories are widely used nowadays.A rational seismic design procedure for this kind of structure is thus necessary.Higher mode contributions to the seismic response can be considered according to the modal theory.So based on the directly displacement-based seismic design theory,this paper proposes a new directly displacement-based seismic design procedure.In the procedure,each mode of the high-rise structure is equivalent to a single-degree-of freedom system according to modal theory.The seismic responses of each single-degree-of freedom system are calculated,which are relevant to seismic response of the corresponding mode.The total seismic responses of the structure are the weighted sum of all modes considered.The weight coefficient is the modal participation factor of each mode.Considering the characteristic of strengthened stories,two stories above the strengthened stories are taken as the "key stories",whose performance means the performance of the building.Only performance of the "key stories" is calculated in the proposed design procedure.So the design procedure is simple and applicable.The proposed procedure is logical,simple and can serve for reference to actual design.
High rise structures with strengthened stories are widely used nowadays.A rational seismic design procedure for this kind of structure is thus necessary.Higher mode contributions to the seismic response can be considered according to the modal theory.So based on the directly displacement-based seismic design theory,this paper proposes a new directly displacement-based seismic design procedure.In the procedure,each mode of the high-rise structure is equivalent to a single-degree-of freedom system according to modal theory.The seismic responses of each single-degree-of freedom system are calculated,which are relevant to seismic response of the corresponding mode.The total seismic responses of the structure are the weighted sum of all modes considered.The weight coefficient is the modal participation factor of each mode.Considering the characteristic of strengthened stories,two stories above the strengthened stories are taken as the "key stories",whose performance means the performance of the building.Only performance of the "key stories" is calculated in the proposed design procedure.So the design procedure is simple and applicable.The proposed procedure is logical,simple and can serve for reference to actual design.
引文
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[14]SEAOC.Performance-based Seismic Engineering of Buildings.Sacramento:Vision 2000 Committee[R].Structural Engineers Association of Cali-fornia,Sacramento,1995.
[2]钟善桐,刘大林.刚伸臂在钢管混凝土高层框筒结构体系中的工作性能[J].哈尔滨建筑大学学报,2002,35(1):12-19.
[3]程绍革,刘经伟.上海仙乐斯广场模型振动台试验[J].建筑科学,1998,14(5):8-13
[4]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.
[5]汤华,王松帆,周定.广州合银广场结构设计[J].建筑结构20073,1(7):19-22.
[6]杨蓉观.超高层建筑-南京新华大厦上部结构设计[J].工程建设与设计,2001,6:31-34.
[7]邱仓虎,詹永勤,吴彦明.深圳罗湖商务大厦结构修改设计[J].建筑结构学报,2003,23(3):80-84.
[8]徐培福,傅学怡,王翠坤.复杂高层建筑结构设计[M].北京:中国建筑工业出版社2,005.
[9]杨克家,梁兴文,李波.带加强层超高层结构受力性能研究及设计建议[J].建筑结构,20083,8(2):111-115.
[10]Anil K.Chopra Dynamics of Structures,Theory and applications to Earthquake Engineering[M].北京:清华大学出版社2,005.
[11]邓明科,梁兴文,等.剪力墙结构层间位移计算方法探讨[J].地震工程与工程振动,20082,8(3):95-103.
[12]杨克家,梁兴文,李波.带加强层的高层建筑结构性能水准的量化[J].工业建筑,20073,7(12):76-80
[13]梁兴文,黄雅婕,等.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2,005,38(9):53-61.
[14]SEAOC.Performance-based Seismic Engineering of Buildings.Sacramento:Vision 2000 Committee[R].Structural Engineers Association of Cali-fornia,Sacramento,1995.
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