带加强层高层建筑直接基于位移的抗震设计(Ⅰ)——方法理论  

Displacement based seismic design of high-rise buildings with strengthened stories(Ⅰ):Theory

作　　者：杨克家[1] 梁兴文[2] 

机构地区：[1]温州大学建筑与土木工程学院,浙江温州325035 [2]西安建筑科技大学土木工程学院,陕西西安710032

出　　处：《地震工程与工程振动》2011年第5期68-74,共7页Earthquake Engineering and Engineering Dynamics

基　　金：国家自然科学基金资助项目(51108348)

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.

关 键 词：加强层 高层建筑 直接基于位移 抗震设计 

分 类 号：TU355[建筑科学—结构工程]