摘要
为研究不同类型长周期地震动作用下结构的减震效果差异,并分析屈曲支撑布置位置对减震的影响,用SAP2000建立屈曲约束支撑(BRB)和粘滞阻尼器(VD)组合减震的9层Benchmark钢框架结构模型,以屈曲约束支撑边侧单斜向布置和内侧K字形布置两种方案,进行双向多遇及罕遇地震下的动力时程分析,对比几种长周期地震动动力响应及减震效果。结果表明:在多遇地震作用下,不同地震动结构层间位移都能保证在规范限值内,BRB和VD组合减震效果较好;在罕遇地震作用下,不同地震动结构出现不同的塑性铰变化,向前方向性和远场地震动所导致的塑性铰较原结构破坏减小且塑性铰数量减少,滑冲型地震动所导致的塑性铰的破坏较原结构更严重,因此,长周期地震动组合结构设计,应依照不同减震方案择优更为合适。
In order to study the difference in energy dissipation and shock absorption of structures under different types of long-period ground motions,and to analyze the influence of buckling support placement on shock absorption,SAP2000 was used to establish a combination of buckling restrained supports(BRB)and viscous dampers(VD)for shock absorption.The 9-storey benchmark steel frame structure model,with two schemes of buckling restraint support side single oblique arrangement and inner K-shaped arrangement,conducts dynamic time history analysis under bidirectional frequent and rare earthquakes,and compares several long-period ground motions Dynamic response and shock absorption effect;the results show that:under the action of frequent ground motions,the interlayer displacement of the structure under different ground motions can be guaranteed to be within the specification limit,and the shock absorption effect of the combination of BRB and VD is better;Under the earthquake,different ground motion structures have different plastic hinge changes.The plastic hinges caused by forward directional and far-field vibrations are less damaged than the original structure and the number of plastic hinges is reduced.It is more serious than the original structure.Therefore,the design of the long-period ground motion combined structure should be based on different shock absorption schemes.
作者
龙宇
范存新
钱爽
LONG Yu;FAN Cun-xin;QIAN Shuang(School of Civil Engineering,Suzhou University of Science and Technology,Suzhou Jiangsu 215011 China)
出处
《江苏建筑》
2022年第3期28-32,共5页
Jiangsu Construction
关键词
不同长周期地震动
屈曲约束支撑
粘滞阻尼器
组合减震
different long-period ground motions
buckling-constrained support
viscous dampers
combined shock absorption
