轴压比及芯材截面积对屈曲约束支撑-混凝土框架抗震性能影响的研究  

STUDY OF EFFECT OF AXIAL COMPRESSION RATIO AND STEEL CORE CROSS-SECTION AREA ON ASEISMIC BEHAVIOUR OF BUCKLING RESTRAINED BRACE-CONCRETE FRAME

作　　者：李嘉奇[1] 李帼昌[1] 宋永丰[1] 刘忠华[1] 

机构地区：[1]沈阳建筑大学土木工程学院,沈阳110168

出　　处：《工业建筑》2017年第3期1-6,共6页Industrial Construction

基　　金：国家自然科学基金项目(51178276);辽宁省高等学校创新团队支持计划课题(LT2014012)

摘　　要：设计了一榀应用H型钢锚固型连接节点的屈曲约束支撑-混凝土框架(BRBCF)并进行拟静力试验研究,通过ABAQUS软件进行有限元模拟,有限元分析结果与试验结果滞回曲线饱满,吻合度良好。在此基础上,为研究轴压比和屈曲约束支撑芯材厚度对框架抗震性能的影响,分别建立轴压比为0.35~0.75的4个有限元模型和芯材截面积从1 000~6 250 mm^2的7个有限元模型。研究结果表明:轴压比对BRBCF受力影响较小,随着轴压比的提高,承载力会有轻微下降;支撑芯材截面积对框架抗震性能的影响较大,随着截面积的增加,承载力会明显提高,连接节点位置的不平衡内力明显增大,造成该区域的破坏相对严重。One 1/3 scale 2-story 3-bay BRB-concrete frame（ BRBCF） with H-shaped steel embedded joint was tested by pseudo static test. Then based on the test,in order to study the effect of axial compression ratio and steel core cross-section area on seismic behavior on BRBCF,4 models of axial compression ratio from 0. 35 to 0. 75 and 7models of steel core cross-section area from 1 000 to 6 250 mm^2 were established. The results showed that the calculated results were in good agreement with the experimental results,the hysteretic curve of BRBCF was plump;the effect of axial compression ratio on seismic behavior was small,and the bearing capacity decreased slightly with the increase of the axial compression ratio; the changes in the cross-section area of steel core of BRB had a great influence on the result. With the increase of section area,the bearing capacity would be significantly increased,which also made the unbalance internal force of the connection joint be increased,resulting in a relatively serious destruction of the connecting region.

关 键 词：屈曲约束支撑 混凝土框架 拟静力试验 有限元分析 抗震性能 轴压比 连接节点 

分 类 号：TU352.11[建筑科学—结构工程] TU37