[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(
)
基于高温组件模型的火灾下钢框架结构连续倒塌分析
)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
- 基于高温组件模型的火灾下钢框架结构连续倒塌分析
- 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.
- 为探究火灾下钢框架结构的整体行为反应和连续倒塌机制, 对一个1∶2缩尺钢框架结构开展了角部房间受火工况下的连续倒塌试验, 获得了火灾发展全过程的空气温度-时间曲线、构件温度-时间曲线和框架位移-时间曲线, 以及火灾下钢框架结构的连续倒塌破坏模式.基于组件法构建了栓焊节点的高温组件模型, 推导了高温下栓焊节点弯矩-转角曲线的双折线数学模型.在此基础上, 建立了包含栓焊节点高温组件模型的火灾下钢框架结构连续倒塌有限元分析模型, 通过与连续倒塌试验结果进行对比, 验证了有限元分析模型的准确性, 并揭示了火灾下钢框架结构的连续倒塌机制.研究结果表明, 钢框架结构在角部房间受火工况下, 角柱虽然应力比最低, 但由于受到的轴向约束远小于内柱和边柱, 将率先丧失承载能力, 并退出工作, 引发钢框架结构连续倒塌破坏.
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Memo
- Memo:
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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.