建筑结构学报2024，Vol.45Issue(10)：87-96,10.DOI:10.14006/j.jzjgxb.2023.0499
L形截面部分包覆钢-混凝土组合柱轴压性能试验与承载力计算
Axial compression performance test and bearing capacity calculation of L-shaped section partially encased composite steel-concrete columns
摘要
Abstract
To study the axial compression performance of L-shaped partially encased composite steel-concrete(LPEC)columns,axial compression tests of six LPEC short columns were conducted.The influence of critical parameters,such as steel content,link spacing and section aspect ratio,on the load-displacement curve,bearing capacity,stiffness,ductility coefficient and bearing capacity improvement coefficient of LPEC short columns was investigated.The typical failure mode and load-bearing mechanism of LPEC short columns were revealed.Results indicate that the LPEC column has good mechanical performance,and its failure modes are mainly concrete crushing in the middle of the column and local buckling of the section steel flange.Meanwhile,concrete collapse at the end of the column and link breaking around the weld seam also occur in some specimens.Increasing the steel content and decreasing the link spacing can obviously improve the confinement effect of concrete,and then improve the bearing capacity and ductility of the specimen,whereas the influence of the section aspect ratio on the bearing capacity is not significant.In addition,for LPEC columns,the axial compression bearing capacities calculated by the steel-concrete composite column bearing capacity formulas given in the specifications ACI318-14,Eurocode 4 and T/CECS 719-2020'Technical specification for partially-encased composite structures of steel and concrete'are conservative due to failing to consider the concrete confinement effect.Based on the superposition principle,a simplified calculation method for the axial compression bearing capacity of LPEC columns considering the confinement effect of concrete was proposed,and the calculated results are in good agreement with the experimental results.关键词
部分包覆钢-混凝土组合柱/L形截面/轴压试验/约束效应/承载力计算Key words
partially encased composite steel-concrete column/L-shaped section/axial compression test/confinement effect/bearing capacity calculation分类
建筑与水利引用本文复制引用
毛佳月,刘用,王静峰,陶书庆..L形截面部分包覆钢-混凝土组合柱轴压性能试验与承载力计算[J].建筑结构学报,2024,45(10):87-96,10.基金项目
中国地震局工程力学研究所基本科研业务费专项资助项目(2021D08),中央高校基本科研业务费专项(JZ2023HGTB0259). （2021D08）
