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作者:

Zhu, Hongjie (Zhu, Hongjie.) | Chen, Shicai (Chen, Shicai.) | Ahmed, Mizan (Ahmed, Mizan.) | Liang, Qing Quan (Liang, Qing Quan.)

收录:

EI Scopus SCIE

摘要:

Circular concrete-filled steel double-tube (CFSDT) columns have shown excellent ductility and load-carrying capacity. However, research on the fire resistance of CFSDT columns is still limited. This paper presents the fire tests, finite element (FE) modeling, behavior, and design of circular CFSDT columns and concrete-filled steel double-skin (CFSDS) columns exposed to fire. The fire resistance tests of one CFSDS and six CFSDT columns are described. Analysis is given on the effects of the material strength, the thickness of the inner steel tube, and the load ratio on the fire resistance of the specimens. Finite element models are developed that simulate the fire behavior of filled composite columns with double tubes and are verified by fire test results. The verified FE models are employed to undertake parametric studies on the structural responses of CFSDS and CFSDT columns under fire exposure. A design model is proposed for calculating the fire resistances of CFSDT columns. The results show that the load ratio and the column slenderness ratio have the most significant effect on the fire resistance of CFSDT columns; the cross-sectional parameters remarkably affect the fire resistance; and the material strength has a moderate impact on the fire resistance of CFSDT columns. Compared with CFSDS specimens, the existence of the core concrete significantly increases the fire resistance of CFSDT columns. The proposed design model for fire resistance can yield a safe prediction.

关键词:

Design method Concrete -filled steel double -tube columns Concrete -filled steel double -skin columns Finite element analysis High -temperature

作者机构:

  • [ 1 ] [Zhu, Hongjie]Beijing Univ Technol, Dept Civil Engn, Beijing 100000, Peoples R China
  • [ 2 ] [Chen, Shicai]Beijing Univ Technol, Dept Civil Engn, Beijing 100000, Peoples R China
  • [ 3 ] [Ahmed, Mizan]Curtin Univ, Ctr Infrastruct Monitoring & Protect, Sch Civil & Mech Engn, Kent St, Bentley, 6102, Australia
  • [ 4 ] [Liang, Qing Quan]Victoria Univ, Coll Sport Hlth & Engn, POB 14428, Melbourne, Vic 8001, Australia

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来源 :

THIN-WALLED STRUCTURES

ISSN: 0263-8231

年份: 2024

卷: 198

6 . 4 0 0

JCR@2022

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