圆钢管再生混凝土长柱偏心受压承载性能试验研究  

Experimental study on eccentric compression bearing capacity of circular steel tube recycled concrete long column

作　　者：闫晓鸣 张兆强[2] YAN Xiaoming;ZHANG Zhaoqiang(Shenzhen Municipal Design and Research Institute Co.,Ltd.,Shenzhen 518029,China;School of Civil Engineering and Architecture,Southwest University of Science and Technology,Mianyang 621010,China)

机构地区：[1]深圳市市政设计研究院有限公司,深圳518029 [2]西南科技大学土木工程与建筑学院,绵阳621010

出　　处：《建筑结构》2024年第6期18-22,共5页Building Structure

基　　金：四川省科技厅应用基础项目(2018JY0443);绵阳市科技攻关项目(15S-02-3)。

摘　　要：以偏心距为主要变化参数,对6个圆钢管再生混凝土长柱进行了偏心受压单调加载试验。通过试验观察了试件的破坏形态,分析了荷载-轴向位移曲线、荷载-纵向应变曲线以及延性,并研究了偏心距对试件承载力的影响。结果表明:圆钢管再生混凝土长柱在偏心荷载作用下,先后经历了弹性阶段、弹塑性阶段和承载力下降阶段,具有较好的延性,其破坏主要表现为钢管壁屈曲而导致试件整体失稳破坏;试件的承载力以及纵向变形随着偏心距的增加而降低;建议采用《钢管混凝土结构技术规范》(GB 50936—2014)和《组合结构设计规范》(JGJ 138—2016)进行圆钢管再生混凝土偏压长柱的承载力计算。With eccentricity as the main variable parameter,eccentric compression monotone loading tests were carried out on 6 circular steel tube recycled concrete long columns.The failure forms of the specimens were observed through test,the load-longitudinal displacement curves,load-longitudinal strain curves and ductility were analyzed,and the influence of eccentricity on the bearing capacity of the specimens was studied.The results show that,under eccentric load,the circular steel tube recycled concrete long column has experienced the elastic stage,the elastoplastic stage and the bearing capacity decline stage successively,and has good ductility.The failure is mainly manifested as the buckling of the steel tube wall,which leads to the whole instability failure of the specimen.The bearing capacity and longitudinal deformation of the specimen decrease with the increase of eccentricity.It is suggested to use the Technical specification for concrete-filled steel tube structures(GB 50936—2014)and the Design specification for composite structures(JGJ 138—2016)to calculate the bearing capacity of the circular steel tube recycled concrete eccentric compression long column.

关 键 词：钢管再生混凝土 长柱 偏心受压 偏心距 承载力 

分 类 号：TU398.9[建筑科学—结构工程]