不同低加载速率下圆钢管混凝土轴压柱的试验研究  

Experimental study on axial compression of concrete-filled steel tube columns under different low loading rates

作　　者：常岩军[1] 陈万丽 容恩超 肖权 韦良 CHANG Yanjun;CHEN Wanli;RONG Enchao;XIAO Quan;WEI Liang(College of Civil Engineering and Architectural,Guangxi University,Key Laboratory of Engineering Disaster Prevention and Structural Safety of Ministry of Education,Guangxi Key Laboratory of Disaster Prevention and Engineering Safety,Nanning 530004,China)

机构地区：[1]广西大学土木建筑工程学院,工程防灾与结构安全教育部重点实验室,广西防灾减灾与工程安全重点实验室,广西南宁530004

出　　处：《实验力学》2022年第1期99-106,共8页Journal of Experimental Mechanics

基　　金：国家自然科学基金项目(51878186,51738004,11962001,51868007);广西创新驱动重大专项(AA18118055)。

摘　　要：为研究低加载速率对强围箍作用下圆钢管混凝土柱的影响,分别采用2mm/min、10mm/min、20mm/min和25mm/min的加载速率对20个短柱试件进行轴心受压试验,得到了不同低加载速率下钢管混凝土柱的荷载-位移曲线与荷载-应变曲线。基于试验结果分析了低加载速率对强围箍作用的钢管混凝土短柱轴压力学性能产生的影响,揭示了钢管混凝土柱在轴压作用下初始损伤以及二次强化效应的机理。结果表明:不同低加载速率条件下钢管混凝土柱的破坏形态相似,极限承载力随着套箍系数的增大而增大,相同套箍系数的钢管混凝土柱的荷载-位移曲线和荷载-应变曲线的趋势基本相同,极限承载力相差不大,强围箍作用的钢管混凝土轴压短柱对低加载速率的变化不敏感。In order to study the influence of low loading rates on the concrete-filled steel tube(CFST)columns with strong confinement,20 short columns were subjected to axial compression experiment at loading rates of 2mm/min,10mm/min,20mm/min and 25mm/min respectively.The load-displacement curves and load-strain curves of the CFST columns under different low loading rates were obtained.Based on the experimental results,the influence of low loading rate on the axial compressive properties of the CFST columns with strong confinement effect were analyzed,and the mechanism of initial damage and the secondary strengthening effect of CFST columns under axial compression were revealed.It is shown that the failure modes of CFST columns under different low loading rates are similar,and the ultimate bearing capacity increases with the increase of the confinement factor.The trends of load-displacement curves and load-strain curves of CFST columns with the same confinement are approximately the same,and the ultimate bearing capacity is slightly different.The CFST columns with strong confinement are not sensitive to the low loading rates.

关 键 词：钢管混凝土柱 强围箍作用 低加载速率 荷载-位移曲线 荷载-应变曲线 

分 类 号：TU398[建筑科学—结构工程]