考虑持久荷载影响的CFT柱稳定承载力试验研究  

Experimental study on stability capacity of CFT columns considering the influence of long-term load

作　　者：赖秀英 陈宝春[2] 郑娟 黄来平 Lai Xiuying;Chen Baochun;Zheng Juan;Huang Laiping(College of Civil Engineering,Putian University,Putian 351100,China;College of Civil Engineering,Fuzhou University,Fuzhou 350108,China;Kaihui Group(Fujian)Co.Ltd,Putian 351100,China)

机构地区：[1]莆田学院土木工程学院,福建莆田351100 [2]福州大学土木工程学院,福建福州350108 [3]凯辉集团(福建)有限公司,福健莆田351100

出　　处：《建筑科学》2023年第3期65-73,共9页Building Science

基　　金：福建省科技厅自然基金项目(2020J05208,2020J01910);莆田学院引进人才科研启动项目(2018059);东南沿海工程结构防灾减灾福建省高校工程研究中心(JDGC03);福建省住建厅科技研究开发项目(2022-K-21)。

摘　　要：进行以长细比λ和轴压比m为参数的钢管混凝土(CFT)轴心受压柱的持久荷载试验研究,分析长期荷载作用后CFT柱的稳定承载力。结果表明,与未施加持久荷载的中长柱相比,持久荷载作用后钢管进入弹塑性和塑性时对应的荷载降低,而构件达到最大荷载时对应的应变增大;随长细比和轴压比的增大,长期荷载作用对CFT柱稳定承载力的影响越大,且前者的影响大于后者。提出采用考虑持久荷载作用影响的核心混凝土应力-应变关系模型,分三阶段计算的有限元计算方法分析持久荷载作用后的CFT柱稳定极限承载力,结果与试验结果吻合较好,可用于参数分析。The creep experiment of concrete-filled steel tube(CFT)axially compressed medium-long columns with slenderness ratio and axial compression ratio as parameters is carried out,and the stable bearing capacity of CFT medium-long columns after long-term load is analyzed.The results show that.compared with medium-length columns without long-term load,the corresponding load decreases when the steel tube enters elastic-plasticity and plasticity after long-term load,while the corresponding strain increases when the member reaches the maximum load;with the slenderness ratio and axial compression ratio increase,the long-term load has a greater influence on the stability of the CFT middle-long column,and the former has a greater influence than the latter.The stress-strain relationship model of core concrete considering the effect of sustained load is proposed,and the finite element calculation method of three-stage calculation is used to analyze the stability ultimate bearing capacity of CFT column after sustained load.The results are in good agreements with the test results,which can be used for parameter analysis.

关 键 词：钢管混凝土构件 轴心受压 持久荷载 试验 有限元 

分 类 号：TU399[建筑科学—结构工程]