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作者:

Han, Lin-Hai (Han, Lin-Hai.) | Zhou, Kan (Zhou, Kan.) | Tan, Qing-Hua (Tan, Qing-Hua.) | Song, Tian-Yi (Song, Tian-Yi.)

收录:

EI Scopus SCIE

摘要:

One advantage of steel reinforced concrete (SRC) columns is that the concrete encasement reduces the maximum temperature attained by the steel section in the full-range fire situation. For fire-exposed SRC columns, a better understanding of their post-fire performance can facilitate their rehabilitation and being re-used. This paper presents a numerical study into the post-fire performance of SRC columns. Results show that an SRC column of 600 x 600 mm in cross-section retained 0.87 times of the original load-bearing capacity after exposure to full-range fire with a heating duration of 45 min and a subsequent linear cooling down phase of 139 min. After the SRC column fully cooled down to ambient temperature, the proportion of load carried by the steel section increased to 73%, significantly higher than the level at ambient temperature (20%). Results of the parametric study revealed that a number of factors, i.e., duration of fire exposure, cross-sectional size, slenderness ratio and concrete strength, significantly affected the post-fire residual strength. The numerical method was applied to the post-fire assessment of the SRC columns in a fire-exposed building and a case study is presented. The resistance of the SRC column to compression reduced by 4% after fire exposure. By using the proposed repair method, the resistance to compression can be recovered by 11% compared to that before fire exposure.

关键词:

Composite column Assessment method Post-fire Concrete-encased steel section Steel reinforced concrete (SRC) Residual strength

作者机构:

  • [ 1 ] [Han, Lin-Hai]Tsinghua Univ, Dept Civil Engn, Beijing 100084, Peoples R China
  • [ 2 ] [Zhou, Kan]Tsinghua Univ, Dept Civil Engn, Beijing 100084, Peoples R China
  • [ 3 ] [Tan, Qing-Hua]Natl Univ Def Technol, Dept Mat Sci & Engn, Changsha 410072, Hunan, Peoples R China
  • [ 4 ] [Song, Tian-Yi]Beijing Univ Technol, Coll Architecture & Civil Engn, Beijing 100124, Peoples R China

通讯作者信息:

  • [Han, Lin-Hai]Tsinghua Univ, Dept Civil Engn, Beijing 100084, Peoples R China

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来源 :

ENGINEERING STRUCTURES

ISSN: 0141-0296

年份: 2020

卷: 211

5 . 5 0 0

JCR@2022

ESI学科: ENGINEERING;

ESI高被引阀值:115

被引次数:

WoS核心集被引频次: 43

SCOPUS被引频次: 50

ESI高被引论文在榜: 0 展开所有

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