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

发布时间：2018-06-06 19:26

本文选题：减震结构 + 框架-核心筒结构　；参考：《建筑结构学报》2017年12期

【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。
[Abstract]:In this paper, two groups of seismic records with obvious long-period components are selected as input, and the elastic analysis is carried out on the background of a super-tall frame-core tube structure under the action of frequent earthquakes of 7 degrees. The results are compared with the results of seismic response analysis under the input of the normal ground motion records of the corresponding leveling. The results show that the seismic response index of the structure under the input of long-period ground motion, such as the base shear force, the inter-story displacement angle and the acceleration magnification factor, is much larger than that of the ordinary ground motion, and it is difficult to meet the design requirements of the shock absorber by using the conventional dampers. Based on the mechanical properties of viscous dampers, a large displacement damper with high performance is proposed, and a theoretical formula is established. The seismic responses of super-tall structures with large displacement-coupled dampers and ordinary dampers under the action of long-period ground motion are compared and analyzed. The results show that the damping effect of large displacement dampers is better than that of conventional dampers, and the dynamic response of super-tall structures under long-period ground motion can be reduced more effectively.
【作者单位】：上海大学土木工程系;陕西煤业化工集团(上海)胜帮化工技术有限公司;
【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)
【分类号】：TU973

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