摘要
在不同强度外部激励下传统的复摩擦摆支座(double friction pendulum bearing,DFPB)缺乏自适应性能。为解决这一问题,在DFPB中设置形状记忆合金(shape memory alloy,SMA)拉索,提出了SMA拉索-复摩擦摆支座(SMA cable-double friction pendulum bearing,SCDFPB)。该隔震支座可在水平方向提供多级隔震控制能力,适用于多水准地震作用下的性能化结构隔震设计。设计并制作缩尺比例为1∶3的SCDFPB试件,对其开展滞回性能试验研究,获得了等效刚度、单位循环耗能、等效阻尼比以及等效动摩擦系数的变化规律。试验结果表明:随着位移幅值的增大,SMA拉索-复摩擦摆支座的水平荷载-位移曲线由双线性滞回曲线变为三线性滞回曲线;等效刚度和单位循环耗能变化明显,二者最大变化幅度分别为90%和135%;等效阻尼比主要处于0.10~0.20之间;等效动摩擦系数保持为0.05~0.06。
The conventional double friction pendulum bearing(DFPB)lacks an adaptive behavior to different external loads.To address this issue,by combining superelastic shape memory alloy(SMA)cables with a DFPB,a new isolator termed as SCDFPB is presented.The SCDFPB has a multi-level horizontal isolation capacity that is suitable for the performance-based isolation design of engineering structures under various earthquake intensities.One 1∶3 scaled SCDFPB specimen was designed and fabricated,and experimental tests were conducted to study the hysteretic behavior of the isolator.The variation laws of performance parameters such as equivalent stiffness,energy dissipation per cycle,equivalent damping ratio and kinetic friction coefficient were obtained from the experimental investigation.The experimental results show that the horizontal load-displacement curves of the SCDFPB transits from bilinear to trilinear hysteresis loops with increased displacement amplitudes.The equivalent stiffness and the energy dissipation per cycle vary evidently,with the corresponding maximum variation degrees being 90%and 135%,respectively.The equivalent damping mainly varies from 0.10 to 0.20,and the kinetic friction coefficient is in a range of 0.05-0.06.
作者
庄鹏
孙仕琦
韩淼
ZHUANG Peng;SUN Shiqi;HAN Miao(Beijing University of Civil Engineering and Architecture,School of Civil and Transportation Engineering,Beijing 100044,China;Beijing Advanced Innovation Center for Future Urban Design,Beijing University of Civil Engineering and Architecture,Beijing 100044,China;Beijing Higher Institution Engineering Research Center of Structural Engineering and New Materials,Beijing University of Civil Engineering and Architecture,Beijing 100044,China)
出处
《建筑结构学报》
EI
CAS
CSCD
北大核心
2021年第S02期482-489,共8页
Journal of Building Structures
基金
北京市自然科学基金项目(8182016)
关键词
隔震
复摩擦摆支座
形状记忆合金拉索
低周往复加载试验
滞回性能
seismic isolation
double friction pendulum bearing
shape memory alloy cable
low-cycle reversed loading test
hysteretic performance
作者简介
庄鹏,出生于1976年,男,工学博士,副教授,主要从事大跨度空间结构抗震与振动控制研究。email:zhuang_peng@sina.com
