摘要
为使主结构的建筑功能与减震性能得到同时提升,提出了一种使用附加减震结构加固主结构的理论分析模型及关键参数算法。通过令主结构无阻尼幅频曲线峰值在不动点处取得最小值,得出了主结构的减震频率控制方程及附加结构的阻尼比计算式。利用数值方法,分析了主结构的幅频曲线特性。结果表明:主结构幅频曲线上的不动点在频域范围存在极限位置,使得主结构的最小幅频峰值在频域内有极限位置;主结构的减震性能有一定频率相关性;附加结构阻尼比数值能达到的前提下,质量比、耦连频率比及主结构阻尼比越大时,主结构的减震效果越好。运用该减震控制方法的工程实例分析结果表明,由简化模型所得的减震控制方法能够运用于以一阶模态控制的多自由度体系,并使得加固后的主结构最大层间位移角降低29.56%。
In order to promote the building function and seismic performance in main structure,a theoretical model and its key parameters algorithm for retrofitting the main structure with additional damping structure were proposed. By minimizing the peak value of amplitude-frequency curve of the undamped main structure at the fixed point, the seismic control frequency governing equation of the main structure and the damping ratio equation of additional structurel were obtained. The characteristics of amplitude-frequency curve of the main structure were further analyzed by numerical method. The results show that the fixed point of amplitude-frequency curve of main structure has extreme position in frequency domain, which results in the minimum value of amplitude-frequency of main structure also has extreme position in frequency domain. The seismic performance of the main structure has a certain frequency dependence. Under the premise that the damping ratio of the additional structure can be reached, the seismic performance of main structure is better with larger mass ratio, coupling frequency ratio and damping ratio of main structure. The case study shows that the seismic control method obtained from simplified model can be applied to the multi-degree-of-freedom system governed by first-order mode, and the maximum story drift of retrofitted main structure is reduced by 29.56%.
作者
陈伟
陶忠
戴必辉
CHEN Wei;TAO Zhong;DAI Bihui(Department of Civil Engineering and Architecture,Kunming University of Science and Technology,Kunming 650500,China;Engineering Seismic Institute in Yunnan Province,Kunming 650500,China)
出处
《建筑结构学报》
EI
CAS
CSCD
北大核心
2021年第5期92-100,共9页
Journal of Building Structures
基金
国家重点研发计划(2017YFC0703603)。
关键词
减震加固
附加减震结构
减震控制方程
减震特性
时程分析
seismic retrofit
additional damping structure
seismic reduction governing equation
seismic reduction property
time history analysis
