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选取长周期分量明显的2组地震动记录作为输入,以一超高层框架-核心筒结构为背景,进行了7度多遇地震作用下的弹性分析,并与相应水准普通地震动记录输入下的地震响应分析结果进行了比较。结果表明:长周期地震动输入下结构的地震响应指标如基底剪力、层间位移角和加速度放大系数远比普通地震动的大,采用常规阻尼器已很难满足减震设计要求。基于黏滞阻尼器力学特性,提出了高性能位移放大型阻尼器,建立了理论公式,并对附加位移放大型阻尼器和普通阻尼器的超高层结构在长周期地震动作用下的地震响应进行对比分析。研究结果显示,位移放大型阻尼器对结构内力、位移和加速度的减震效果要明显优于普通阻尼器,能更有效地降低超高层结构在长周期地震动作用下的动力响应。
Based on a super high-rise frame-core tube structure, two groups of seismic records with obvious long-period component are selected as input. The elastic analysis is carried out under the action of the earthquake of degree 7, Seismic response analysis results were compared. The results show that the seismic response indexes of structures under long-period ground motions, such as the base shear force, interlayer displacement angle and acceleration amplification factor, are much larger than ordinary ground motions. It is difficult to meet the requirements of seismic design using conventional dampers. Based on the mechanical characteristics of viscous dampers, a high-performance displacement amplifying damper is proposed, and a theoretical formula is established. The seismic response of the super-tall structures with additional displacement amplifying dampers and ordinary dampers under long-period earthquakes Comparative analysis. The results show that the damping effect of displacement amplification damper on internal forces, displacements and accelerations of structures is obviously better than that of ordinary dampers, which can effectively reduce the dynamic response of super high-rise structures under long-period ground motions.