郑新志, 郭好振, 孙玉涛.穿孔肋-拉杆约束方钢管混凝土柱轴压性能研究[J].河南理工大学学报（自然科学版）,2022,41(2):164-170.

ZHENG X Z, GUO H Z, SUN Y T. On axial compression behavior of square CFST short columns constrained by bars through the variable perforated stiffener[J].Journal of Henan Polytechnic University(Natural Science) ,2022,41(2):164-170.

穿孔肋-拉杆约束方钢管混凝土柱轴压性能研究

郑新志1,2,3, 郭好振1,2, 孙玉涛1,2

1.河南理工大学 生态建筑与环境构建河南省工程实验室,河南 焦作 454000;2.河南理工大学 土木工程学院,河南 焦作 454000;3.清 华大学 土木水利学院,北京 100084

摘要:为了进一步提高方钢管混凝土柱的轴压承载力,改善其局部屈曲,提出一种新的穿孔肋-拉杆约束方钢管混凝土柱。在试验基础上,数值模拟穿孔肋-拉杆约束方钢管混凝土柱的轴压破坏形态、极限承载力和延性。对比分析仅设加劲肋方钢管混凝土短柱和加劲肋宽厚比不同的穿孔肋-拉杆约束方钢管混凝土短柱在相同条件下的轴压性能,结果表明,穿孔肋-拉杆约束方钢管混凝土柱破坏时,沿高度和横截面方向的变形分布比仅设加劲肋短柱更加均匀,且有更高的承载力和延性。随着穿孔肋宽厚比增加,穿孔肋与拉杆的协同作用逐渐增强,轴压承载力、延性都呈现出递增趋势。与试验结果对比可知,模拟与试验结果的荷载-位移曲线在弹性上升段和弹塑性上升段吻合最好,极限承载力差值在2％以内。穿孔肋-拉杆约束方钢管混凝土柱的数值模拟分析对其在工程实际中的应用有重要的参考价值。

关键词:钢管混凝土;穿孔肋;轴压性能;数值模拟

doi:10.16186/j.cnki.1673-9787.2020050086

基金项目:国家自然科学基金资助项目（51608179）；河南省重点研发与推广专项（科技攻关）项目（182102310010）；河南省高等学校 重点科研项目（17A560023）

收稿日期:2020/05/27

修回日期:2020/12/16

出版日期:2022/03/15

OnaxialcompressionbehaviorofsquareCFSTshortcolumnsconstrainedbybarsthroughthevariableperforatedstiffener

ZHENG Xinzhi1,2,3, GUO Haozhen1,2, SUN Yutao1,2

1.Ecological Architecture and Environment Construction Engineering Laboratory of Henan Province, Henan Polytechnic University, Jiaozuo  454000 , Henan, China;2.College of Civil Engineering, Henan Polytechnic University, Jiaozuo  454000 , Henan, China;3.School of Civil Engineering, Tsinghua University, Beijing  100084 , China

Abstract: In order to further improve the axial bearing capacity and local buckling of concrete-filled steel tube ( CFST) column,the new square CFST columns constrained by bars through the perforated stiffener was proposed.On the basis of the experiment,the axial compressive behavior of square CFST short columns constrained by bars through the perforated stiffener was studied by numerical simulation.The axial compressive performance of the CFST short column constrained by bars was compared with the column only with the stiffener under the same condition,the square CFST short column was designed with the different width to thickness ratio of the stiffener.It was concluded that the square CFST short columns constrained by bars through the perforated stiffener had better bearing capacity and ductility than the column only with the stiffener.The distribution of deformation along the direction of height and cross section of the column was more uniform than the column only with stiffener.With the width to thickness ratio of the stiffener,the axial bearing capacity and ductility of the specimens showed an increasing trend.And the synergy between the stiffener and the bar was gradually enhanced.By comparing with the experimental results,it could be seen that the load-displacement curves fit the simulation and experimental results in the elastic rising section and the elastic-plastic rising section,and the difference of ultimate bearing capacity was less than 2% .The numerical simulation analysis of the square CFST columns constrained by bars through the perforated stiffener had important reference value for its application in engineering practice.

Key words:CFST;perforated rib;axial compression performance;numerical simulation

穿孔肋-拉杆约束方钢管混凝土柱轴压性能研究_郑新志.pdf