建筑结构学报2024，Vol.45Issue(2)：123-135,13.DOI:10.14006/j.jzjgxb.2022.0346
圆中空夹层钢管混凝土叠合短柱轴压受力性能研究
Mechanical performance of circular concrete-encased CFDST stub columns under axial compression
摘要
Abstract
To study the mechanical behavior of circular concrete-encased concrete-filled double-skin steel tube(CFDST)columns under axial compression and propose a design method for calculating the ultimate strength,a total of ten circular concrete-encased CFDST stub columns were tested under axial compression with the CFDST ratio and the sectional diameter as testing variables.The failure process,failure mode,longitudinal strain and transverse deformation coefficient were investigated,and the key parameters affecting the axial stiffness,strength index and ductility index were determined.Then,a finite element model(FEM)was developed.The full-ranged process,the contact stress and the influences of critical parameters were analyzed.Based on the above analysis,the design method for the ultimate strength of the circular concrete-encased CFDST stub column was further proposed.The results show that the circular concrete-encased CFDST stub column can exhibit compatible deformation performance.An increasing confinement factor will improve the composite effect of the specimens.Increasing the characteristic stirrup value will improve the ductility index.When the CFDST ratio increases from 0.5 to 0.6 and 0.7,the ductility index improves by 9.6％and 18.7％,respectively.When the sectional diameter increases from 220 mm to 260 mm and 300 mm,the axial stiffness improves by 22.2％and 43.8％,respectively.At the peak load,the external reinforced concrete(RC)component reaches the corresponding ultimate strength,and the internal load borne by the CFDST component is less than its ultimate strength.The contact stress between the RC component and the CFDST component is negligible.The ultimate strength of the circular concrete-encased CFDST stub column can be effectively predicted by introducing the strength reduction factor.关键词
中空夹层钢管混凝土叠合柱/静力试验/有限元分析/轴压性能/设计方法/约束效应系数/配箍特征值Key words
concrete-encased CFDST column/static test/finite element analysis/axial compression behavior/design method/confinement factor/characteristic stirrup value分类
建筑与水利引用本文复制引用
丁纪楠,王庆贺,任庆新..圆中空夹层钢管混凝土叠合短柱轴压受力性能研究[J].建筑结构学报,2024,45(2):123-135,13.基金项目
国家自然科学基金项目(51678373),辽宁省"兴辽英才计划"项目(XLYC1902027),辽宁省科技厅博士启动项目(2021-BS-165),辽宁省应用基础研究计划(2022JH2/101300130). （51678373）
