方形截面碳纤维增强聚合物-钢管混凝土轴压柱承载力分析  

Analysis of load carrying capacity of axially compressed concrete filled CFRP-steel tubular columns with square cross-section

作　　者：王庆利[1] 李佳[1] 赵维娟[1] 

机构地区：[1]沈阳建筑大学土木工程学院,辽宁沈阳110168

出　　处：《建筑结构学报》2013年第S1期274-280,共7页Journal of Building Structures

基　　金：教育部新世纪优秀人才支持计划(NCET-08-0865);国家自然科学基金面上项目(51378320)

摘　　要：采用ABAQUS软件分析了方形截面碳纤维增强聚合物-钢管混凝土(S-CFRP-CFST)轴压柱的工作机理,分析结果表明:随着长细比的增加,试件轴压柱从全截面受压过渡到到部分截面受拉;钢管在柱中截面首先屈服,然后向两端发展;横向受拉的CFRP对柱提供了很好的约束作用,纵向受拉的CFRP对柱起到了很好的增强作用。钢管与混凝土的相互作用力沿轴向在柱中截面最大,向两端逐渐减小;沿截面边长在角部最大,向边长中点逐渐减小。黏结强度对柱的承载力和弹性阶段的刚度以及对钢管与混凝土之间的相互作用力基本没有影响。给出了S-CFRP-CFST轴压中长柱的承载力计算表达式,计算结果与试验结果吻合良好。The mechanism of axially compressed concrete filled CFRP-steel tubular(S-CFRP-CFST) columns with square cross-section were analyzed using ABAQUS software,and the results show that the compressive region on crosssection varies from compression on the whole cross-section to tension on partial cross-section with slenderness ratio increase for the specimens.The steel tube yields firstly on the cross-section at mid-height,and then the yielding propagates toward the two ends.The transverse CFRP in tension provides effective confinement on the columns and the longitudinal CFRP in tension provides effective enhancement on the columns.The interaction force between the steel tube and the concrete reaches its maximum value on the cross-section at mid-height,and it decreases when the distance to the two ends becomes smaller.On the cross-section,the interaction force has its maximum value at the corner while it decreases when the position moves to the mid-point of the tube side.The bonding strength between the steel tube and the concrete has little effect on the load carrying capacity,the elastic stiffness of the columns as well as the interaction force between the steel tube and the concrete.Equation for calculating the loading carrying capacity of the composite columns with moderate slenderness ratio is presented,and the estimated results agree well with the experimental results.

关 键 词：方形截面碳纤维增强聚合物-钢管 内填混凝土 轴压中长柱 静力性能 机理分析 承载力 

分 类 号：TU398.9[建筑科学—结构工程]