郑新志, 孙玉涛, 郭好振.穿孔肋拉杆约束方钢管混凝土短柱轴压试验[J].河南理工大学学报（自然科学版）,2021,40(2):186-192.

ZHENG X Z, SUN Y T,GUO H Z,et al.Axial compression experiment of square CFST short columns constrained bybars through perforated stiffeners[J].Journal of Henan Polytechnic University(Natural Science) ,2021,40(2):186-192.

穿孔肋拉杆约束方钢管混凝土短柱轴压试验

郑新志1, 孙玉涛2, 郭好振1

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

摘要:为了弥补仅设加劲肋和仅设拉杆的方钢管混凝土柱存在的性能不足，本文提出了穿孔肋拉杆约束方钢管混凝土柱。制作了 1个仅设置加劲肋方钢管混凝土短柱和5个穿孔肋拉杆约束方钢管混凝土短柱，进行轴压试验，并对比分析了试件的破坏过程、破坏形态、承载力、延性等，以及加劲肋、拉杆、钢管壁的应变曲线。结果表明：拉杆直径增大对试件极限承载力的提高有限，但可以提高延性；拉杆纵向间距缩小使核心混凝土受到加劲肋和管壁的约束作用增强，试件的极限荷载和延性均有较大提高。穿孔肋拉杆的设置能增强对核心混凝土的约束作用，提高钢管壁的屈曲强度，延缓了加劲肋与混凝土之间的黏结滑移和变形，提高带肋方形钢管混凝土短柱的极限轴压承载力和延性。研究成果对穿孔肋拉杆约束方钢管混凝土柱的研究和实际工程应用有重要的参考价值。

关键词:方钢管混凝土短柱;轴压试验;穿孔肋;拉杆;约束作用

doi:10.16186/j.cnki.1673-9787.2019110091

基金项目: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:2019/11/25

修回日期:2020/03/07

出版日期:2021/03/15

Axial compression experiment of square CFST short columns constrained bybars through perforated stiffeners

ZHENG Xinzhi1, ' 2, SUN Yutao1

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

Abstract:In order to make up for the deficiency of square CFST with only stiffeners or bars， the CFST short columns with bars through the perforated rib was put forward. One square CFST short column with only stiffeners and Five CFST short columns with bars through the perforated rib were made to carry out the axial compression test. The failure process， failure form ， bearing capacity， ductility and strain curves of stiffeners ， bars and steel tubes were compared and analyzed. The test results showed that the increase of the diameter of the bar was limited to the increase of the ultimate bearing capacity， but it could improve the ductility ； With the reduction of the longitudinal spacing of bars， the ultimate load and ductility of specimens were greatly improved with the increase of the confinement on the core concrete. The setting of bars through the perforated rib could strengthen the restraining effect on the core concrete， improve the buckling strength of the tube， delay the bondslip and deformation between the tube， and the concrete and improve the ultimate axial bearing capacity and the ductility of CFST short columns with ribs. The experimental results had important reference value for the research and engineering application of CFST short columns with bars through the perforated rib.

Key words:CFST short column;axial compression experiment;perforated stiffener;bar;restraint effect

 穿孔肋拉杆约束方钢管混凝土短柱轴压试验_郑新志.pdf