中南大学学报（自然科学版）2024，Vol.55Issue(6)：2247-2259,13.DOI:10.11817/j.issn.1672-7207.2024.06.017
钢管预置集料混凝土中长柱受压性能试验
Experiment on compression performance of preplaced aggregate concrete-filled steel tube slender column
摘要
Abstract
In order to explore the compression performance of preplaced aggregate concrete-filled steel tube(PACFST)slender column,firstly,11 PACFST slender columns and 3 normal concrete-filled steel tube(CFST)slender columns were designed with consideration of influential factors such as concrete type,concrete strength,diameter-to-thickness ratio,length-to-diameter ratio and eccentricity ratio.Secondly,by the axial compression and eccentric compression tests and the finite element analysis method,the variation law of failure mode,bearing capacity and deformation characteristics of the specimens were studied.Finally,based on the limit equilibrium theory,the calculation equations for axial compression and eccentric compression bearing capacity of PACFST slender columns were established.The results show that the failure modes of PACFST slender columns are similar to those of CFST slender columns,both of which are flexural buckling failure.The bearing capacity of PACFST slender columns is equivalent to that of CFST slender columns,but the axial stiffness of PACFST slender columns is about 1.2 times of that of CFST slender columns,which shows a good ability to resist deformation.The bearing capacity increases by 33.8%when the diameter-to-thickness ratio of PACFST slender columns decreases from 39.75 to 19.88.The bearing capacity drops by 20.5%as the length-to-diameter ratio increases from 6 to 15.The bearing capacity decreases by 49.5%when the eccentricity ratio increases from 0.25 to 1.0.The stability coefficient of PACFST slender columns is affected by concrete strength and diameter-to-thickness ratio slightly,but decreases almost linearly with the increase of length-to-diameter ratio and eccentricity ratio.The calculation formula of bearing capacity proposed in this paper can provide reference for the design of PACFST slender columns.关键词
钢管混凝土/预置集料混凝土/中长柱/受压性能/承载力计算方法Key words
concrete-filled steel tube/preplaced aggregate concrete/slender column/compression performance/bearing capacity calculation method分类
建筑与水利引用本文复制引用
吕晶,郑健龙,韩文超,张金翼,赵欢..钢管预置集料混凝土中长柱受压性能试验[J].中南大学学报（自然科学版）,2024,55(6):2247-2259,13.基金项目
国家自然科学基金资助项目(51908046) （51908046）
陕西省重点研发计划项目(2023-YBSF-219) （2023-YBSF-219）
中国博士后基金资助项目(2019M653517) （2019M653517）
长安大学中央高校基本科研业务费专项资金资助项目(300102281204)(Project(51908046)supported by the National Natural Science Foundation of China （300102281204）
Project(2023-YBSF-219)supported by the Key Research and Development Program of Shaanxi Province （2023-YBSF-219）
Project(2019M653517)supported by the China Postdoctoral Science Foundation （2019M653517）
Project(300102281204)supported by the Fundamental Research Funds for the Central Universities,CHD) （300102281204）
