长周期地震波作用下超高层框架-核心筒减震结构动力响应分析  

Dynamic response analysis of super high-rise frame-core tube structure under long-period ground motions

作　　者：郭彦[1] 刘文光 何文福[1] 董秀玲 

机构地区：[1]上海大学土木工程系,上海200072 [2]陕西煤业化工集团(上海)胜帮化工技术有限公司,上海201203

出　　处：《建筑结构学报》2017年第12期68-77,共10页Journal of Building Structures

基　　金：国家自然科学基金项目(51278291;51478257);上海市自然科学基金项目(15ZR1416200)

摘　　要：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。A super high-rise frame-core tube structural elastic time-history analysis under the frequent earthquake of seismic fortification intensity zone 7 was researched. Two groups of ground motion records with obvious long-period components were selected as the seismic input. Main seismic response values were compared with the results under the corresponding normal ground motion input cases. Comparison of the results shows that seismic responses such as base shear,inter-story drift ratio and acceleration amplification factor under long-period ground motions are apparently higher than the seismic responses under normal ground motions,which indicates that the usage of conventional dampers may not be suitable for reducing structural responses under long-period ground motion. A new displacement amplification damping system and its theoretical formulas were proposed to improve energy dissipation capacity based on the viscous damper＇s mechanical characteristic. The responses of original structure and damping structure with and without displacement amplification damping system under long-period ground motion were compared. It is concluded that the proposed displacement amplification damping system can perform more effectively in reducing high-rise structural seismic responses subject to long-period ground motions.

关 键 词：减震结构 框架-核心筒结构 位移放大型阻尼器 长周期地震动 有限元分析 地震响应 

分 类 号：TU973.14[建筑科学—结构工程] TU352.12