[1] Ding Runmin, Fan Shenggang,. Progressive collapse analysis of steel frames under fire based on high-temperature component model [J]. Journal of Southeast University (English Edition), 2023, 39 (4): 361-371. [doi:10.3969/j.issn.1003-7985.2023.04.005]

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Progressive collapse analysis of steel frames under fire based on high-temperature component model()

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Journal of Southeast University (English Edition)[ISSN:1003-7985/CN:32-1325/N]

Volumn:

39

Issue:

2023 4

Page:

361-371

Research Field:

Civil Engineering

Publishing date:

2023-12-20

Info

Title:

Progressive collapse analysis of steel frames under fire based on high-temperature component model

Author(s):

Ding Runmin;  Fan Shenggang

Key Laboratory of Concrete and Prestressed Concrete Structures of Ministry of Education, Southeast University, Nanjing 211189, China
School of Civil Engineering, Southeast University, Nanjing 211189, China

Keywords:

fire;  component model;  welded flange-bolted web connection;  progressive collapse;  steel frame

PACS:

TU391

DOI:

10.3969/j.issn.1003-7985.2023.04.005

Abstract:

To explore the overall behavior response and progressive collapse mechanism of steel frame structures under fire, a progressive collapse test was conducted on a 1∶2 scale steel frame structure with a corner room subjected to fire. Consequently, the air temperature-time, component temperature-time, and frame displacement-time curves of the entire fire development process, as well as the progressive collapse failure mode of steel frame structures under fire, were obtained. A high-temperature component model of welded flange-bolted web connections was established using the component method, and a bilinear mathematical model for the moment-rotation angle curves of welded flange-bolted web connections at high temperatures was derived. On this basis, a finite element analysis model was established for the progressive collapse of steel frame structures under fire, including the high-temperature component model of welded flange-bolted web connections. The accuracy of the finite element analysis model was verified by comparison with the progressive collapse test results, and the progressive collapse mechanism of steel frame structures under fire was revealed. The results show that under fire within the corner room of a steel frame structure, even though the stress ratio of the corner column is the lowest, primarily due to its lower axial constraint than the inner and side columns, the corner column will first lose its load-bearing capacity and withdraw from work. This triggers the progressive collapse failure of the steel frame structure.

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Memo

Memo:

Biographies: Ding Runmin(1995—), male, Ph. D. candidate; Fan Shenggang(corresponding author), male, doctor, professor, 101010393@seu.edu.cn.
Foundation items: The National Natural Science Foundation of China(No. 52278153, 51878146), Scientific Research Foundation of Graduate School of Southeast University.
Citation: Ding Runmin, Fan Shenggang.Progressive collapse analysis of steel frames under fire based on high-temperature component model[J].Journal of Southeast University(English Edition), 2023, 39(4):361-371.DOI:10.3969/j.issn.1003-7985.2023.04.005.

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