重庆大学学报2025，Vol.48Issue(2)：86-101,16.DOI:10.11835/j.issn.1000-582X.2024.259
多腔中空薄壁方钢管混凝土短柱轴压性能研究
Axial compressive behavior of thin-walled multi-cavity concrete-filled double-skin(square inner and square outer)steel tubular stub columns
摘要
Abstract
To improve the axial performance of concrete-filled double-skin steel tubular(CFDST)stub columns,a novel thin-walled multi-cavity concrete-filled double-skin tubular(MCFDST)stub column was proposed.Experimental investigations were conducted to evaluate the axial compressive behavior of these columns.A total of fifteen MCFDST stub columns and three CFDST stub columns were designed and fabricated,with four key parameters examined:concrete compressive strength(CCS),width-to-thickness ratio(WTR)of the outer tube,hollow ratio(HR),and the presence of tensile ribs.The study assessed deformation,load-displacement behavior,damage patterns,and ductility coefficient to determine the ultimate bearing capacity,failure mode,and ductility performance of the columns.Experimental results show that increasing the CCS from 58 MPa to 90 MPa enhances the bearing capacity by 46%,while reducing the ductility coefficient by 74%.A decrease in WTR from 39 to 29 results in a 12.5%improvement in bearing capacity alongside a notable increase in ductility coefficient.The HR increase from 0.31 to 0.38 yields marginal improvements in bearing capacity(1.3%)and ductility coefficient(1.0%).Notably,the presence of tensile ribs significantly increases the bearing capacity and ductility coefficient by 14.2%and 282%,respectively.Moreover,the experimental data validated the effectiveness and accuracy of numerical modeling,which facilitated extensive finite element parameter analyses.The applicability of current design methods for predicting axial bearing capacity was also discussed,indicating that the prediction formula in Japanese standard AIJ is suitable for estimating the axial compressive bearing capacity of MCFDST stub columns.关键词
方套方中空夹层多腔钢管混凝土短柱/试验研究/轴压性能/失效模式/极限承载力/延性系数Key words
multi-cavity concrete-filled double-skin tubular stub column/experimental study/axial compressive behavior/failure mode/ultimate bearing capacity/ductility coefficient分类
建筑与水利引用本文复制引用
张潇,龚俊,邵永波,黄伟峰,李紫君..多腔中空薄壁方钢管混凝土短柱轴压性能研究[J].重庆大学学报,2025,48(2):86-101,16.基金项目
四川省青年科技创新团队项目(2019JDTD0017) （2019JDTD0017）
中国博士后科学基金(2022M722639) （2022M722639）
四川省自然科学基金(2023NSFSC0889).Supported by the Scientific Innovation Group for Youths of Sichuan Province(2019JDTD0017),China Postdoctoral Science Foundation(2022M722639),and Natural Science Foundation of Sichuan Province,China(2023NSFSC0889). （2023NSFSC0889）
