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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。
Taking the first-order high-rise frame-core tube structure with self-vibration period of 7.35s as the research object, seven seismic waves were selected according to the response spectrum of “Building Seismic Design Code” (GB50011-2010) and seven long-period seismic waves were added as input Sample to study the influence of earthquake excitation of different periods on the seismic behavior of such structures. The research shows that the period of the earthquakes (0.339 ~ 0.666s) selected by the code is far from the first natural period of the structure. Under the excitation of 14 long and short-period seismic waves, the structural displacement, damage, deformation and energy dissipation are quite different. Under the action of long-period earthquakes, the average maximum displacement angle of the maximum layer is 2.57 times larger than that of the short period, and some of the main force components are severely damaged. The energy consumption of deformation and hysteresis can reach 36.4% of the total input energy, while the short period Earthquake action under the basic structure in good condition. Therefore, it is difficult to evaluate the seismic capacity of a long-period structure whose natural period exceeds the standard range (6s) only based on the selected ground motion. It is suggested that earthquakes with different periods should be used to comprehensively evaluate the seismic performance of long-period structures.