Experimental and numerical investigation of circular concrete-filled steel tubular columns subjected to post-earthquake fires

IF 5.6 1区 工程技术 Q1 ENGINEERING, CIVIL Engineering Structures Pub Date : 2025-03-06 DOI:10.1016/j.engstruct.2025.120008
Guo-Qiang Wei , Wen-Da Wang , Kan Zhou , Wen-Jing Mao
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Abstract

Fires induced by earthquakes are high-probability events that can accelerate the collapse of buildings. This research investigates the fire resistance of eight circular concrete-filled steel tubular (CFST) columns under four earthquake damage levels through experimental methods. The earthquake damage and fire tests were conducted continuously without unloading the axial loads. The impact of earthquake damage levels and axial load ratios on fire resistance were studied. The failure mode, temperature evolution, fire performance, and deformation of the columns under post-earthquake fire (PEF) were analyzed and discussed. In addition, the validated numerical method was used to simulate the fire resistance of the columns that suffered seismic damage. The results show that the maximum axial expansion of the columns gradually decreases with increasing seismic damage. When the axial load ratio is 0.284, a slight decrease in fire resistance occurs at drift ratios exceeding 2.67 %, and plastic hinges form at the mid-height of the column at failure. When the drift ratio reaches 4.48 %, premature lateral displacement induces a more pronounced second-order effect, accelerating column instability and leading to a significant decrease in fire resistance. At an axial load ratio of 0.431, although the lateral stiffness of the column decreases more severely, fire resistance exhibits only a slight reduction at a drift ratio of 4.42 %.
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来源期刊
Engineering Structures
Engineering Structures 工程技术-工程:土木
CiteScore
10.20
自引率
14.50%
发文量
1385
审稿时长
67 days
期刊介绍: Engineering Structures provides a forum for a broad blend of scientific and technical papers to reflect the evolving needs of the structural engineering and structural mechanics communities. Particularly welcome are contributions dealing with applications of structural engineering and mechanics principles in all areas of technology. The journal aspires to a broad and integrated coverage of the effects of dynamic loadings and of the modelling techniques whereby the structural response to these loadings may be computed. The scope of Engineering Structures encompasses, but is not restricted to, the following areas: infrastructure engineering; earthquake engineering; structure-fluid-soil interaction; wind engineering; fire engineering; blast engineering; structural reliability/stability; life assessment/integrity; structural health monitoring; multi-hazard engineering; structural dynamics; optimization; expert systems; experimental modelling; performance-based design; multiscale analysis; value engineering. Topics of interest include: tall buildings; innovative structures; environmentally responsive structures; bridges; stadiums; commercial and public buildings; transmission towers; television and telecommunication masts; foldable structures; cooling towers; plates and shells; suspension structures; protective structures; smart structures; nuclear reactors; dams; pressure vessels; pipelines; tunnels. Engineering Structures also publishes review articles, short communications and discussions, book reviews, and a diary on international events related to any aspect of structural engineering.
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