摘要
在不影响建筑使用空间前提下,提出在抗侧构件不连续处设置耗能腋撑以改善竖向不规则结构抗震性能。以底部大空间短肢剪力墙结构为研究对象,利用大型通用有限元程序ETABS研究耗能器类型与场地土对耗能腋撑工作性能和竖向不规则结构受力性能的影响。研究表明,黏滞型耗能腋撑对文中分析模型各楼层地震反应有较好的控制效果,对转换层处层间位移角与层剪力最大值减幅最大,分别为40.14%和15.66%,对顶层加速度与基底剪力峰值的最大减幅分别为16.06%和23.57%,黏滞型耗能腋撑最大能耗散输入结构能量的42%,而黏弹型耗能腋撑对结构的控制效果不理想;当地震震级较大、震中距较小时,耗能腋撑对坚硬与软弱场地土的模型结构控制作用相差不大,减震位移比在转换层处达到最小值0.76;随着震级减小或震中距增大,耗能腋撑对该模型结构的控制作用随场地土变硬而逐渐增强,其减震位移比介于0.68～0.74之间。
To make full utilization of floor space,energy dissipation haunch brace was proposed to be installed at the transfer story to improve the seismic performance of vertically irregular short-leg pier shear wall structures.A short-leg pier shear wall structure with large space at the bottom stories was selected.The effects of dampers and ground soil on the working performance of energy dissipation haunch brace and the seismic performance of vertically irregular structure were studied by using ETABS program.Results show that the significant control effects on the seismic responses of the model structure can be achieved by installing viscous energy dissipation haunch braces. The maximum inter-story drift angle and story shear can be decreased 40.14% and 15.66% respectively at the transfer story.The peak values of top floor acceleration and base shear are decreased 16.06% and 23.57% maximally,and the seismic energy can be maximally dissipated 42% by viscous energy dissipation haunch braces.The control effects of viscoelastic haunch braces are insignificant.For the cases of great earthquake magnitude and near epicenter,quite equivalent control effects of model structure built on soft or hard soil can be produced.The minimum damping displacement ratio at transfer story is 0.76.When decreasing earthquake magnitude or increasing epicentral distance,the control effects are gradually magnified for structures on stiffer site soil.The minimum damping displacement ratio is between 0.68 and 0.74.
出处
《地震工程与工程振动》
CSCD
北大核心
2010年第2期105-112,共8页
Earthquake Engineering and Engineering Dynamics
基金
国家自然科学基金项目(56078040)
广东省自然科学基金项目(8151009101000010)
广东省自然科学基金研究团队项目(8351009101000001)
建设部项目(2009-2K-36)
中央高校基本科研业务资助项目(2009ZM0230)
关键词
竖向不规则
耗能腋撑
短肢剪力墙
耗能减震
vertical irregularity
energy dissipation haunch brace
short-leg pier shear wall
seismic energy dissipation
