【摘要】 以第一阶自振周期为7.35s的超高层框架-核心筒结构为研究对象,依据《建筑抗震设计规范》(GB50011—2010)反应谱选取7条地震波,并补充7条长周期地震波作为输入样本,研究不同周期地震激励对该类结构抗震性能的影响。研究表明,根据规范选取的地震动周期(0.339~0.666s)与结构第一自振周期相差较远。在14条长、短周期地震波激励下,结构位移、损伤、变形及能量耗散均存在较大差异。长周期地震动作用下,最大层间位移角的平均值比短周期大2.57倍,部分主要受力构件发生严重损伤、变形,滞回耗能占总输入能最大可达到36.4%,而短周期地震动作用下结构基本处于完好状态。因此,对于自振周期超出规范范围(6s)的长周期结构,仅根据规范选取的地震动难以评估结构的抗震能力,建议选取不同周期地震动全面地评估长周期结构的抗震性能。更多还原

【Abstract】 A super high-rise frame-core tube structure with the natural vibration period of 7.35 s was selected to study the seismic performances and effects of long-period high-rise buildings under different period earthquake excitations.Seven ground motions were selected according to the designing spectrum defined in Code for seismic design of buildings( GB50011—2010),and seven long-period ground motions were also selected as a supplement.Results show that the predominant periods of the seven ground motions based on the code are between 0.339 s and 0.666 s,which are much different from the natural period of the structure.Under the fourteen earthquake actions with different periods,the development of damages,deformation and energy dissipation of main structural components differ significantly.Under longperiod ground motions,the averaged maximum story drift is 2.57 times of that under short-period ground motions,and serious plastic deformation and damage can be found in some main structural members and the hysteretic energy of plastic deformation could be up to 36.4% of the total input energy.While the structure is basically in good condition under shortperiod excitations.Therefore,for structures with natural period longer than the range of design spectrum in the code,seismic capability of the structure can not be estimated properly under ground motions chosen merely by the code.Earthquake actions with different periods are recommended to comprehensively evaluate seismic performances of the longperiod structures.更多还原