摘要
作为消能减震装置,黏滞阻尼器通过耗散地震输入结构的能量来减轻结构的地震反应,其中结构位移和楼面加速度的降低程度是评价减震效果的重要指标。利用不同黏滞阻尼器参数及结构刚度组合下的单自由度减震结构的性能曲线,将结构位移降低率和楼面加速度降低率作为地震反应降低程度的评价指标,研究了黏滞阻尼器参数和结构刚度对减震效果的影响。基于上述研究,将单自由度减震结构性能曲线推广到多自由度体系,以实际多层钢框架结构为例,将多自由度体系简化为等效单自由度体系,绘制出等效单自由度体系性能曲线,根据目标位移降低率及目标加速度降低率,预估黏滞阻尼器参数。本文通过对设置黏滞阻尼器的多层钢框架减震结构进行设防地震弹塑性时程分析,获取设置黏滞阻尼器后结构动力响应的降低率,与性能曲线预测方法比较,验证了该预测方法的可行性。
As an energy dissipation device,a viscous damper reduces the seismic response of a structure by dissipating the energy input to the structure,in which the reduction of structural displacement and floor acceleration are important indicators to evaluate the vibration reduction effects.In this paper,the performance curves of single-degree-of-freedom vibration reduction structures with different combinations of viscous damper parameters and structural stiffness are used to study the effects of viscous damper parameters and structural stiffness on the vibration reduction effect by using the structural displacement reduction rate and floor acceleration reduction rate as evaluation indicators of the degree of seismic response reduction.Based on the above study,the performance curve of single-degree-of-freedom vibration damping structure is extended to the multi-degree-of-freedom system,and the multi-degree-of-freedom system is simplified to an equivalent single-degree-of-freedom system by taking the actual multi-story steel frame structure as an example,and the performance curve of the equivalent single-degree-of-freedom system is drawn,and the parameters of viscous dampers are predicted according to the target displacement reduction rate and the target acceleration reduction rate.In this paper,the reduction rate of structural dynamic response is obtained by performing the elastic-plastic time analysis of a multi-story steel frame vibration damping structure set up with viscous dampers,and the feasibility of the prediction method is verified by comparing it with the performance curve prediction method.
作者
刘曦文
尹弘峰
卢鑫
LIU Xiwen;YIN Hongfeng;LU Xin(China IPPR International Engineering Co.,Ltd.,Beijing 100089,China)
出处
《建筑结构》
北大核心
2023年第S02期855-860,共6页
Building Structure
关键词
消能减震
黏滞阻尼器
阻尼器参数
性能曲线
energy dissipation
vibration reduction
viscous damper
viscous damper parameter
performance curve
作者简介
第一作者:刘曦文,硕士,工程师,主要从事结构设计工作,Email:se7en_1991@hotmail.com。
