摘要
为了研究防屈曲支撑结构在地震作用下的抗震性能,采用低屈服点钢材制作内芯板,设计和加工制作了1/4缩尺的钢框架-防屈曲支撑试件,对其进行3种不同地震波作用下的振动台试验,分析了该结构在不同等级地震波作用下的破坏形式、动力特性、加速度响应、层间位移角、应变等力学性能.结果表明:在不同强度地震波作用下,各构件均没有明显的破坏现象.试件的初始基本自振频率为23.12 Hz,初始阻尼比为2.78%.随着加载的峰值加速度增大,自振频率逐渐降低,但阻尼比逐渐增加.试验结束时,试件的刚度退化率为5.4%.结构的加速度放大系数随地震强度的增大而减小,且二层的加速度放大系数大于一层.结构的最大层间位移角在小震和大震下分别为1/3000和1/314,满足结构抗震设计要求.框架梁和柱各测点的应变随地震峰值加速度的增加逐渐增大,且应变变化趋势在工况5之前呈线性变化,之后呈非线性变化.
In order to investigate the seismic performance under seismic action,the 1/4 scaled specimen of steel frame-buckling restrained brace with the inner core plate made of low-yield-point steel was designed and fabricated,on which shaking table tests under three different seismic waves were carried out.The mechanical properties of the structure such as failure mode,dynamic characteristics,acceleration response,inter-story drift ratios,and strain distribution were analyzed under different intensity levels of seismic waves.The results show that no obvious damage to each steel component is observed under the seismic action of different intensities.The initial fundamental natural frequency of the specimen is 23.12 Hz and the initial damping ratio is 2.78%.As the loading peak acceleration increases,the natural vibration frequency slowly decreases,whereas the damping ratio gradually increases.The stiffness degradation rate of the specimen is 5.4%at the end of the test.The acceleration amplification coefficient of the second floor is greater than that of the first floor,which decreases with the increase of earthquake intensity.The maximum inter-story drift ratios of the structure are 1/3000 and 1/314 under frequent earthquake and rare earthquake respectively,which satisfies the seismic design requirements.The strains at measuring points of the frame beam and the column increase with the increase of loading peak accelerations.The strain changes linearly before the loading case 5.After that,the strain trend shows a nonlinear change.
作者
邵建华
赵超
刘汶津
王展光
SHAO Jianhua;ZHAO Chao;LIU Wenjin;WANG Zhanguang(School of Civil Engineering and Architecture, Jiangsu University of Science and Technology, Zhenjiang 212005, China;Nanjing Dade Damping Technology Co. Ltd., Nanjing 211103, China;School of Architectural Engineering, Kaili University, Kaili 556011, China)
出处
《江苏科技大学学报（自然科学版）》
CAS
2020年第4期102-110,共9页
Journal of Jiangsu University of Science and Technology:Natural Science Edition
基金
贵州省科技计划项目(黔科合基础[2019]1288)
国家自然科学基金资助项目(51308260)
贵州省教育厅创新群体重大研究项目(黔教合KY字[2017]048)
江苏高校境外研修计划资助(2018169)。
关键词
防屈曲支撑
振动台试验
抗震性能
动力特性
地震作用
buckling restrained brace
shaking table test
seismic performance
dynamic characteristic
earthquake action
