A scaling law for fire duration in RC frames to resist fire-induced progressive collapse: Considering critical design parameters

IF 5.6 1区 工程技术 Q1 ENGINEERING, CIVIL Engineering Structures Pub Date : 2025-03-09 DOI:10.1016/j.engstruct.2025.120099
Dongqiu Lan , Liu Jin , Yaowen Yang , Renbo Zhang , Jian Li , Kai Qian
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Abstract

Fire is a significant factor that can lead to progressive collapse in structures. Due to spatial limitations, scaled models are often employed in collapse experiments. However, traditional similarity laws for fire testing require scaled models to experience heating rates much higher than those of the prototype, which is difficult to achieve with standard fire furnaces. This study addresses this challenge by conducting numerical analyses on geometrically scaled reinforced RC beam-column structures. A unified similarity law for fire duration is proposed, incorporating key design parameters such as span-depth ratio, reinforcement ratio, and concrete cover thickness. This law enables scaled models to replicate progressive collapse behavior of RC prototype frames. The results reveal that similar mechanical performance can be achieved when rebar and average beam-section temperatures are comparable, despite variations in internal concrete temperatures. Additionally, smaller span-depth ratios cause more severe beam damage under fire exposure. Increasing span-depth ratios from 10 to 12 and 14 has minimal impact on load capacity at ambient temperature. However, smaller span-depth ratios result in higher ultimate load capacity after prolonged fire exposure. These findings provide a practical approach for scaling fire-induced collapse experiments and highlight the role of the key design parameters in determining structural performance under elevated temperatures.
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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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