带肋方钢管高强混凝土柱轴压性能试验研究  

EXPERIMENTAL RESEARCH ON MECHANICAL PROPERTIES OF STIFFENED HIGH STRENGTH CONCRETE-FILLED SQUARE STEEL TUBULAR COLUMNS UNDER AXIAL COMPRESSION

作　　者：刘洁[1] 郭江涛[1] 成玉佳 LIU Jie;GUO Jiangtao;CHENG Yujia(Department of Architectural Engineering,Yangling Vocational and Technical College,Yangling 712100,China)

机构地区：[1]杨凌职业技术学院建筑工程分院,陕西杨凌712100

出　　处：《钢结构》2018年第8期39-43,共5页Steel Construction

基　　金：陕西省教育厅2017年专项科学研究计划项目(17JK0880)

摘　　要：为研究加肋方钢管高强混凝土组合柱的轴压力学性能,以加劲肋刚度为变化参数,进行了7个带肋方钢管高强混凝土短柱试件轴压试验研究,对比分析了试件破坏特征、屈曲模态及应力应变规律。结果表明:设置加劲肋有效延缓了管壁屈曲,改变了管壁屈曲模态以及应力路径,加劲肋刚度对组合柱承载力影响不显著;随着加劲肋刚度增大,钢管环向与纵向应力比增大,钢管对核心混凝土约束作用增大,组合柱纵向刚度增大,钢管纵向屈服应力减小,钢管屈服发生在组合柱达到峰值荷载之后。To study the mechanical properties of high strength concrete-filled square steel tubular short columns with inner welded longitudinal stiffeners,7 specimens were tested under axial compression,the failure characteristics,buckling modes and stress-strain rules of specimens were compared and analyzed. It was found that the stiffeners could delay local buckling of the tube and change its mode and stress path,it had no significant influence on the bearing capacity of the columns; with the increase of the stiffness of the longitudinal stiffener,the ratio of hoop to longitudinal stress and the restrained effect of the steel tube on the core concrete increased,the longitudinal stiffness of columns also increased,but the longitudinal stress of yield point of the steel tube decreased,the steel pipe yielded after the combined column reached the peak load.

关 键 词：方钢管高强混凝土 加劲肋刚度 轴压试验 屈曲模态 应力状态 

分 类 号：TU398.9[建筑科学—结构工程]