自复位磁流体阻尼支撑滞回特性及其结构抗震性能  

Hysteretic Characteristics and Structural Seismic Performance of Magnetorheological Damping Self-Centering Braces

作　　者：谢行思 张长春 高未未 XIE Xingsi;ZHANG Changchun;GAO Weiwei(School of Civil Engineering,Beijing Jiaotong University,Beijing 100044,China;Inspection and Certification Co.,Ltd.,MCC,Beijing 100088,China)

机构地区：[1]北京交通大学土木建筑工程学院,北京100044 [2]中冶检测认证有限公司,北京100088

出　　处：《工业建筑》2024年第3期118-125,共8页Industrial Construction

基　　金：国家自然科学基金项目(52208455);中国博士后科学基金(2022M710340)。

摘　　要：对能够同时提供库仑阻尼和黏滞阻尼的自复位磁流体阻尼支撑(Magnetorheological Damping Self-Centering Brace,简称MR-SCB)开展动力性能试验,结果表明:支撑表现出饱满的旗形滞回曲线,复位和耗能能力出色。支撑半圈耗能随碟簧组预压力和刚度改变而产生的变化幅度不大,极限承载力随预压力和刚度的增大而增加,残余位移随预压力的增大而减小。当加载频率和位移分别为0.7 Hz和22 mm时,支撑等效黏滞阻尼比和残余位移分别为0.215和5.3 mm,相较0.3 Hz激励下分别增长了14.4%和61.1%。对布置MR-SCB的钢框架结构进行非线性模拟分析,发现MR-SCB耗散更多地震输入能量,相较传统自复位支撑可实现更好的位移控制效果。在罕遇地震时,残余位移响应离散度更低,最大结果由0.061%减小至0.049%。结构层间位移和残余位移均随支撑黏滞阻尼占比的增大而减小。A dynamic performance test was conducted on a magnetorheological damping self-centering brace(MR-SCB)that can provide both Coulomb damping and viscous damping simultaneously.The results showed that the brace exhibited a full flag-shaped hysteretic curve,with excellent recentering and energy dissipation capabilities.Its energy dissipation in half-cycle did not change significantly with the change of the pre-pressed force and stiffness of disc spring group.The ultimate bearing capacity increased with the increase of the pre-pressed force and stiffness,while the residual displacement decreased with the increase of pre-pressed force.When the loading frequency and displacement were 0.7 Hz and 22 mm,respectively,the equivalent viscous damping ratio and residual displacement of brace were 0.215 and 5.3 mm,respectively,increasing by 14.4%and 61.1%compared with those under 0.3 Hz excitation.A nonlinear simulation analysis was conducted on a steel frame structure with MR-SCBs,and it was found that compared with traditional self-centering braces,MR-SCB dissipated more input seismic energy,achieving better control effect on the displacement of frame.Under rarely occurred earthquakes,the statistical dispersion of residual displacement response was lower,and the maximum result was reduced from 0.061%to 0.049%.The interstory drift and residual displacement of the structure decreased with the increase of proportion of viscous damping force of braces.

关 键 词：自复位支撑 磁流体 动力性能试验 滞回响应 支撑–框架结构 抗震性能 

分 类 号：TU352.11[建筑科学—结构工程]