摘要
四川省广元市青川县某中学项目位于抗震设防7度(0.15g)区,为钢筋混凝土框架结构,存在最大层间位移角过大和框架梁柱配筋过大的问题。设置屈曲约束支撑提供抗侧刚度和黏滞阻尼器减小地震作用,使最大层间位移角满足了规范要求,并有效减小框架梁柱配筋。对混合减震结构进行不同地震水准下的时程分析,结果表明:设防地震作用下,最大层间位移角减小了15%,基底剪力减小了15%,全楼单位面积用钢量减小约8%,减震效果明显;设防地震作用下,结构最大层间位移角小于1/400,性能水准基本处于基本完好阶段,达到设防地震下正常使用的功能要求;罕遇地震作用下,结构弹塑性最大层间位移角小于为1/150,性能水准处于轻微损伤~中等损坏之间,没有构件发生严重损坏,说明屈曲约束支撑与黏滞阻尼器的共同耗能有效改善了主体结构的塑性损伤,减震效果良好。
A junior middle school building project in Qingchuan County, Guangyuan City, Sichuan Province, is located in the seismic fortification area of 7(0.15g) degree. It is a reinforced concrete frame structure. The maximum inter story displacement angle does not meet the specification requirements and the reinforcement of frame beams and columns is too excessive. Buckling restrained braces are provided to provide lateral stiffness and viscous dampers to reduce seismic action, so that the maximum inter story displacement angle meets the requirements of the code, and the reinforcement of frame beams and columns is effectively reduced. The time history analysis of the hybrid damping structure under different earthquake levels was carried out. The results show that under the action of fortification earthquake, the maximum interstory displacement angle is reduced by 15%, the base shear force is reduced by 15%, and the amount of steel used per unit area of the whole building is reduced by about 8%, so the effect of seismic reduction is obvious. The maximum inter story displacement angle of the structure is less than 1/400, and the performance level is basically in good condition, meeting the functional requirements for normal use under fortification earthquake. Under the rare earthquake,the maximum elastic-plastic inter story displacement angle of the structure is less than 1/150, the performance level is between slight damage and moderate damage, and no member is seriously damaged, indicating that the joint energy consumption of buckling restrained braces and viscous dampers effectively improves the plastic damage of the main structure, and the damping effect is good.
作者
战祖弘
赵攀宇
吴勇
伍燕
刘莉
尹联生
韩海玲
ZHAN Zuhong;ZHAO Panyu;WU Yong;WU Yan;LIU Li;YIN Liansheng;HAN Hailing(HuaTu Cendes Design Co.,Ltd.,Chengdu 610021,China;School of Civil Engineering Architecture and Environment,Xihua University,Chengdu 610039,China)
出处
《建筑结构》
CSCD
北大核心
2022年第S02期822-827,共6页
Building Structure
关键词
混合减震技术
屈曲约束支撑
黏滞阻尼器
附加阻尼比
框架结构减震
mix-dissipation technology
buckling-restrained brace
viscous fluid damper
additional damping ratio
frame structure vibration damping
