Journal of South China University of Technology(Natural Science) >

2025 , Vol. 53 >Issue 8: 87 - 99

DOI: https://doi.org/10.12141/j.issn.1000-565X.240443

Architecture & Civil Engineering

Study on Axial Compression Performance of UHPC Fully Encased Q690 High-Strength Steel Composite Stub Columns

  • LI Tao ,
  • HE Zhengbo ,
  • WEI Guozheng ,
  • CAO Hongyou
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  • School of Civil Engineering and Architecture，Wuhan University of Technology，Wuhan 430070，Hubei，China
李涛（1984—），男，博士，副教授，主要从事组合结构设计研究和钢结构疲劳断裂性能研究。E-mail： scealitao@whut.edu.cn；

Received date: 2025-03-12

  Online published: 2025-03-12

Supported by

the National Key R & D Program of China(2021YFC3100800);the National Natural Science Foundation of China(51908437)

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Abstract

To investigate the axial compression performance and strain compatibility of UHPC fully encased Q690 high-strength steel composite stub columns, this study designed, fabricated, and tested seven specimens under axial compression. The research parameters included the internal arrangement of steel wire mesh, the volume content of UHPC steel fibers, the stirrup spacing, and the cross-section type of steel profiles. It investigated the deformation failure process, ultimate failure mode, and peak bearing capacity of each specimen. The results showed that the UHPC fully encased Q690 high-strength steel composite stub columns exhibited excellent axial compression bea-ring capacity and deformation performance, and the strain compatibility between core UHPC and Q690 high-strength steel can be achieved at peak load. By referring to the bearing capacity calculation methods mentioned in various national codes, including China, Europe, and the United States, theoretical calculations of the axial compression ultimate bearing capacity of the UHPC fully encased Q690 high-strength steel composite stub columns were conducted and the results were compared with the experimental results. It shows that Tthe calculated results are in good agreement with the experimental results, providing a reference for calculating the axial compression bearing capacity of UHPC fully encased Q690 high-strength steel composite stub columns.

Key words： UHPC; Q690 high-strength steel; composite stub column; axial compressive performance; stirrup spacing

Cite this article

LI Tao , HE Zhengbo , WEI Guozheng , CAO Hongyou . Study on Axial Compression Performance of UHPC Fully Encased Q690 High-Strength Steel Composite Stub Columns[J]. Journal of South China University of Technology(Natural Science), 2025 , 53(8) : 87 -99 . DOI: 10.12141/j.issn.1000-565X.240443

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