Numerical Simulation Study on Temperature Field of Steel Frame Building during Firefighting

WANG Ting; SONG Zhensen; XU Yang

doi:10.13409/j.cnki.jdpme.20220120001

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Numerical Simulation Study on Temperature Field of Steel Frame Building during Firefighting

更新时间：2025-09-25

- Numerical Simulation Study on Temperature Field of Steel Frame Building during Firefighting
- Journal of Disaster Prevention and Mitigation Engineering Vol. 43, Issue 5, Pages: 1100-1111(2023)
- 作者机构：
  
  1.上海交通大学船舶海洋与建筑工程学院，上海200240
  2.上海市公共建筑和基础设施数字化运维重点实验室，上海200240
  3.奥雅纳工程咨询（上海）有限公司，上海200031
- 作者简介：
- 基金信息：
- DOI：10.13409/j.cnki.jdpme.20220120001
  CLC： TU998.1
- Received：20 January 2022，
  
  Revised：2022-03-19，
  
  Published：15 October 2023
- 稿件说明：
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王婷,宋振森,徐阳.钢框架房屋火灾消防过程温度场数值模拟研究[J].防灾减灾工程学报,2023,43(05):1100-1111.

WANG Ting,SONG Zhensen,XU Yang.Numerical Simulation Study on Temperature Field of Steel Frame Building during Firefighting[J].Journal of Disaster Prevention and Mitigation Engineering,2023,43(05):1100-1111.
王婷,宋振森,徐阳.钢框架房屋火灾消防过程温度场数值模拟研究[J].防灾减灾工程学报,2023,43(05):1100-1111. DOI： 10.13409/j.cnki.jdpme.20220120001.

WANG Ting,SONG Zhensen,XU Yang.Numerical Simulation Study on Temperature Field of Steel Frame Building during Firefighting[J].Journal of Disaster Prevention and Mitigation Engineering,2023,43(05):1100-1111. DOI： 10.13409/j.cnki.jdpme.20220120001.

摘要

钢结构在火灾消防过程中容易遭到破坏甚至发生倒塌，而空间温度场是研究结构响应的基础。为了研究喷水消防对空间温度场的影响，建立了三层三跨钢框架房屋模型，在火灾动力学软件中利用水喷淋方式模拟了其消防灭火过程。分别研究了消防在火灾初期发展阶段和稳定燃烧阶段介入时，火源及框架平面附近的温度场分布与发展规律，对比分析了消防在不同火灾阶段介入后直接灭火跨与相邻跨的火场温度变化特性。研究结果表明：（1）数值模拟结果与火灾消防试验结果吻合较好，验证了数值模型中采用水喷淋方式模拟喷水消防过程获得温度场的可行性；（2）消防在火灾初期发展阶段介入后，直接灭火跨的温度发生骤降，最大降幅约350 ℃，约20 s后缓慢回升，消防喷水有效减缓火灾发展进程，抑制空间温度与梯度发展，框架附近平面火场达到的最高温度相比无消防介入火灾低约350 ℃；（3）消防在稳定燃烧阶段介入时，空间温度较高、温度梯度较大，消防介入后火场最高温度在60 s左右降低约650 ℃，降温速率约11 ℃/s，短时间内温度梯度变化剧烈；（4）与在稳定燃烧阶段介入相比，消防在火灾初期发展阶段介入可大幅降低火场最高温度，且使温度梯度变化比较缓和。

Abstract

Steel structures may damage or even collapse during fires and firefighting. The temperature field is one of the critical factors affecting the structural response. in this paper， a three-story three-span steel frame building model was established to investigate the impact of firewater on the temperature field. The fire extinguishing process was simulated using water spraying in Fire Dynamics Simulator （FDS）. The distribution and development law of the temperature field adjacent to the combustion source and the steel frame plane in different cases were studied in different scenarios， where firefighting intervention occurred during the initial development stage or the stable combustion stage. The characteristics of temperature variation in the fire-extinguishing span and its adjacent span after firefighting intervention in different fire stages were comparatively analyzed. The results show that：（1） Numerical simulation results matched well with the experimental results， proving that it is feasible to obtain the temperature field by simulating the firefighting process using water spraying in the numerical model. （2） After firefighting intervention in the initial stage， the temperature in the fire-extinguishing span decrease rapidly， with a maximum decrease of about 350 ℃. After about 20 seconds， the temperature began to rise slowly. Firewater slowed down the development of fire， reduced the temperature gradient， lowered the maximum temperature by approximate 350 ℃ adjacent to the frame plane. （3） When firefighting intervention in the stable combustion stage， there were higher temperature and larger gradient in the fire field. The maximum temperature decreased by 650 ℃ in about 60 seconds with a rate of 11 ℃ per second. The temperature gradient changed greatly after firefighting intervention. （4） Compared to firefighting intervention in the stable combustion stage， firefighting intervention in the initial stage can significantly reduce the maximum temperature and result in a slower change in the temperature gradient.

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references

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