薄壁钢管混凝土短柱与薄壁钢管约束混凝土短柱轴压性能试验  

Experiment on Axially Compressive Behavior of Concrete Filled Thin-Walled Steel Tubular Stub Column and Confined Concrete Stub Column with Thin-Walled Steel Tube

作　　者：宋国强 周新刚[1] 夏小龙 赵亚菲 连业辉 SONG Guo-qiang;ZHOU Xin-gang;XIA Xiao-long;ZHAO Ya-fei;LIAN Ye-hui(School of Civil Engineering,Yantai University,Yantai 264005,China)

机构地区：[1]烟台大学土木工程学院,山东烟台264005

出　　处：《烟台大学学报（自然科学与工程版）》2023年第1期104-111,共8页Journal of Yantai University(Natural Science and Engineering Edition)

基　　金：山东省重大科技创新工程资助项目(2019JZZY020307)。

摘　　要：以圆形和方形薄壁钢管混凝土短柱及薄壁钢管约束混凝土短柱为对象,研究了外包钢管受力状态对短柱性能的影响及其机理,分析了截面形状对外包钢管受力状态及其对核心混凝土约束的影响。通过CFRP约束对受力性能的研究,进一步揭示了外包材料受力状态对受力性能的影响。研究表明,圆钢管对核心混凝土约束作用强,试件极限承载力较高,其中圆钢管约束柱中钢管的约束作用更加显著,极限承载力大于圆钢管柱;CFRP约束后,极限承载力和变形性能均得到有效改善。方钢管对核心混凝土的约束效果弱,试件极限承载力较低,且方钢管约束柱的极限承载力小于方钢管柱;CFRP约束对其极限承载力无明显提高,但有效改善了其延性。Two types of circular and square columns,concrete filled thin-walled steel tubular stub column(CFSTSC)and confined concrete stub column with thin-walled steel tube(CCSCST),are tested to investigate the influence and mechanism of stress state in the wrapped steel tube on performances of the columns,and to analyze the influence of cross-sectional shape on stress state in the wrapped steel tube and its constraint on core concrete.In addition,the influence of CFRP confinement is further studied to explore the stress state of the wrapping material on performance of the columns.The results show that circular steel tube has a good confinement effect on core concrete,leading to a higher ultimate bearing capacity.The confinement effect of the steel tube in circular CCSCST is more significant,and its ultimate bearing capacity is higher than that of circular CFSTSC.CFRP confinement can effectively improve both the ultimate bearing capacity and deformation performance of the circular columns.Square steel tube has a weak confinement on core concrete,leading to a lower ultimate bearing capacity.The ultimate bearing capacity of square CCSCST is less than that of square CFSTSC.CFRP confinement in this case cannot obviously raise the ultimate bearing capacity,but can effectively improve the ductility of the square columns.

关 键 词：钢管混凝土 钢管约束混凝土 薄壁 CFRP 轴压承载能力 

分 类 号：TU398.2[建筑科学—结构工程]