火源位置对凹型砖木结构古建筑火蔓延特性影响研究
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张嬿妮(1978—),女,教授,博导,博士。主要从事建筑火灾防护研究。E-mail:zyn2099@xust.edu.cn

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X45

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陕西省创新能力支撑计划(2020TD-021)资助


Study on the Influence of Fire Source Location on Fire Propagation Characteristics of Ancient Buildings with Concave Brick and Wood Structures
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    摘要:

    为探究凹型砖木结构古建筑火灾蔓延特性,以某典型凹型古建筑为研究对象,利用 Pyrosim 软件进行物理模型搭建,研究不同火源位置对火灾蔓延规律的影响,以及在该过程中温度、能见度变化规律和 CO、CO2浓度动态分布情况等。结果表明:不同火源位置对火蔓延特性影响较大,若引火源位于凹型古建筑西南角,相较西北、正北方向两个工况,热释放速率可高达 240 MW/s,应选择在该处设置多个感温探测器及自动喷淋系统用于火灾防范;若引火源位于建筑西南角,相较其他工况室内温度可达最高值 1 000 ℃,CO、CO2浓度亦均达最值,且在垂直高度 1.67 m 处能见度下降速率达到峰值,人员需在 2 min 内全部疏散。该研究对于凹型砖木结构古建筑火灾防控、防灭火装置的合理排布及灾后人员高效、安全疏散具有重大意义和参考价值。

    Abstract:

    To explore the fire spread characteristics of ancient buildings with concave brick and wood structures, a typical concave ancient building is used as the research object, and the physical model is built by using Pyrosim software to study the influence of different fire source locations on the law of fire spread, as well as the change of temperature, visibility and the dynamic distribution of CO and CO2 concentrations in the process. The results show that different ignition source locations have a greater impact on the fire propagation characteristics, and if the ignition source is located in the southwest corner of the concave ancient building, compared with the northwest and north directions, the heat release rate can reach the maximum value of 225 MW/s; If the ignition source is located in the southwest corner of the building, the indoor temperature can reach the maximum value of 1020 ℃ compared with other working conditions, the concentrations of CO and CO2 are also at their maximum values, and the visibility degradation rate reaches the peak at a vertical height of 1.67 m. This study has great significance and reference value for the fire prevention and control of ancient buildings with concave brick and wood structures and the efficient and safe evacuation of personnel after disasters.

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张嬿妮,刘雪梦,舒盼,黄罗鑫,张陆陆,张帅.火源位置对凹型砖木结构古建筑火蔓延特性影响研究[J].防灾减灾工程学报,2023,43(6):1313-1321

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  • 收稿日期:2022-10-28
  • 最后修改日期:2022-12-25
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  • 在线发布日期:2024-01-11
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