T型多腔钢管混凝土柱的大偏压受力性能试验研究  

Experimental study on performance of T⁃shaped multi⁃cavity concrete⁃filled steel tubular columns under large eccentric compression

作　　者：程卫红 时继瑞 姜宇鑫 储德文 马宏睿 Cheng Weihong;Shi Jirui;Jiang Yuxin;Chu Dewen;Ma Hongrui(China Academy of Building Research Co.Ltd,Beijing 100013,China;National Engineering Research Center of Building Technology,Beijing 100013,China)

机构地区：[1]中国建筑科学研究院有限公司,北京100013 [2]国家建筑工程技术研究中心,北京100013

出　　处：《建筑科学》2023年第5期114-123,共10页Building Science

基　　金：兵团科技攻关项目:BXSS建筑关键技术研发与示范应用(项目编号2018AB03)。

摘　　要：已有的多腔异形钢管混凝土柱的偏压性能研究主要基于偏心率较小的小偏心受压试验,对于多腔异形钢管混凝土柱的大偏心受压试验研究较少。进行4个T型多腔钢管混凝土柱的大偏心受压试验,试验偏心率分别为0.85、1.0、1.7和2.0。考察T型多腔钢管混凝土柱在大偏心受压时的破坏模式、荷载-位移曲线、应变发展等试验结果。研究表明:大偏心受压时,各试件的破坏形态均为试件中上部受压侧钢管发生局部鼓曲,试件整体弯曲变形明显,随后承载力达到峰值并快速下降;加载偏心率越大,试件的偏压极限承载力越低。采用Abaqus软件建立各试件的精细有限元分析模型,结果表明有限元计算的极限偏压承载力与试验结果吻合较好。在此基础上,开展有限元模拟参数分析,研究混凝土强度、钢材强度、钢板厚度和加载角度对T型多腔异形钢管混凝土短柱无量纲轴力-弯矩曲线的影响。The existing research on eccentric compression performance of multi⁃cavity special⁃shaped concrete⁃filled steel tubular(CFST)columns are mainly based on eccentric compression tests with small eccentric ratio.Four T⁃shaped multi⁃cavity CFST columns are tested under large eccentric compression with eccentric ratio 0.85,1.0,1.7and 2.0.The failure mode,load⁃displacement curve,strain development and other test results of the tested specimens are studied.The results show that obvious local bulging appears on the pressure side of all specimens with significant overall bending deformation in the limit state.Subsequently,the bearing capacity of all specimens peaks and decreases rapidly.With larger eccentric ratio,the specimens have lower bearing capacity under eccentric compression.The finite element models of specimens are established by Abaqus,and analysis results shows that the calculated bearing capacity under eccentric compression are in good agreement with the test results.Based on the finite element models,parameter simulation analysis are carried out to study the influence of concrete strength,steel strength,steel plate thickness and loading angle on the dimensionless axial force⁃moment curve of the T⁃shaped multi⁃cavity CFST short columns.

关 键 词：T型多腔 钢管混凝土柱 大偏心受压 试验研究 偏心率 无量纲轴力⁃弯矩曲线 

分 类 号：TU317[建筑科学—结构工程]