聚合阻尼减震结构体系及减震效果
Centralized damping seismic reduction structural system and its damping performance
何文福 1姚俊杰 1许浩 1尚峰 1李婕2
作者信息
- 1. 上海大学土木工程系,上海 200444
- 2. 内蒙古建筑职业技术学院,内蒙古呼和浩特 010020
- 折叠
摘要
为了解决超高层框架核心筒结构的外框架和内筒的侧向刚度存在较大差异的问题,提出一种聚合阻尼减震结构体系,通过在核心筒和外框架之间集中布置聚合阻尼装置,利用内外子结构的侧向位移差实现耗能减震.建立了聚合阻尼减震结构的理论分析模型,推导得到其动力传递函数并开展影响参数分析,发现传递函数幅值受阻尼层刚度比影响较小,随阻尼比增大而增大,并基于定点理论可得到该体系最优阻尼比;完成了振动台试验验证和算例分析,与传统结构相比,聚合组尼减震结构在应用一半数量阻尼器的情况下,其顶层位移、加速度和基底剪力减震率分别为26.7％、41.8％和64.9％,附加阻尼比提高至传统结构的6.4倍.
Abstract
To address the significant difference in lateral stiffness between the outer frame and the inner core of super-tall framed-core structures,a centralized damping seismic reduction structural system was proposed.This system strategically places aggregate damping devices between the core and the outer frame to utilize the differential lateral displacements of the inner and outer substructures for energy dissipation and seismic mitigation.A theoretical analysis model of the aggregate damping seismic mitigation system was established,and its dynamic transfer function was derived.Parameter analysis was conducted,and optimal damping ratios for the system were determined based on fixed-point theory.Vibration table tests and numerical analyses were performed to validate the system.Compared to traditional structures,the new system reduces top displacement,acceleration,and inter-story shear by 26.7％,41.8％,and 64.9％,respectively,with fewer damping devices applied.Additionally,the supplemental damping ratio is increased by a factor of 6.4 compared to traditional structures.
关键词
超高层框架-核心筒结构/聚合阻尼减震结构体系/参数优化/振动台试验/地震响应/减震效果Key words
super high-rise frame-core tube structure/centralized damping seismic reduction structural system/parameter optimization/shaking table test/seismic response/damping performance引用本文复制引用
基金项目
国家自然科学基金项目(52108461)
国家自然科学基金项目(52078287)
上海市自然科学基金项目(22ZR1422700)
内蒙古自治区高等学校自然科学技术研究一般项目(NJZY23072)
出版年
2024
国家科技期刊平台
NSTL
万方数据