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To solve the problem of life estimation of reinforced concrete (RC) members after fire, an analysis is made of the resistance of RC members after fire. On basis of the resistance, the life of RC members after fire is analyzed by using JC (Jukes and Cantor) method. Then the calculation models for the resistance and the life estimation of RC members after fire are put forward, and an example analysis proves their reliability and accuracy. 相似文献
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《铁道标准设计通讯》2014,(10):83-88
为研究高海拔特长隧道定点防灾救援设计中不同火灾场景下救援横通道数量对人员疏散的影响,依托关角隧道对高海拔条件下火灾发展及人员疏散过程进行研究。利用FDS火灾模拟软件对关角隧道救援站进行高海拔条件下的火灾数值模拟计算,通过改变火源热释放速率以及救援横通道数量,得到不同火灾场景下可用安全疏散时间。利用人员疏散软件EXODUS对不同场景下高海拔地区人员疏散过程进行模拟,得到必需的人员疏散时间,通过与可用疏散时间的比较,最终确定高海拔特长铁路隧道定点救援站合理的救援横通道数量为8~9座。 相似文献
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Bus fires are a common source of fires that occur in tunnels and are a huge threat to the safety of the tunnel structure and related personnel. An elaborate numerical simulation model of a bus is established considering the different combustion characteristics of the bus body, seats, decorations and baggage. For fires occuring at the bus head, middle part or back seat, the temperature field, heat release rate (HRR) and characteristics of the fire are ana-lyzed. The HRR calculation formula is obtained by superimposing a Boltzmann curve on a Gaussian curve. The re-sults show the peak and average values of a bus HRR are 48 MW and 8.1 MW, respectively, and the released energy due to combustion is 14.5 GJ; the maximum burning temperature reaches 1 040℃ and the temperature near the door can reach 60℃ after 120 sec. The temperature rises fastest at the bus door when the fire occurs at the rear of the bus and it has a high chance of detonating the fuel tank. © 2018, Editorial Office of "Modern Tunnelling Technology". All right reserved. 相似文献
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刘志勇 《铁道标准设计通讯》2019,(1):169-172
地下场段在城市轨道交通建设中越来越普遍,现行相关规范没有具体的规定。通过参考既有建设工程规范,对地下场段设计中存在问题的探讨和国内已建成地下场段实例进行研究,总结地下场段的设计方案,探讨设计中存在问题的解决思路,总结地下场段在消防设计、设施配置等方面的特点。提出城市轨道交通地下场段在设计中,合理地进行建筑定性、防火分区划分、设置消防车作业条件等的方法,以满足使用中的功能及消防需求,为后续类似工程的设计提供参考。地下场段设计中,通过设置消防车进入地下作业条件、设置自然通风采光井等方式,防火分区、人员疏散距离等适当加大,是能够满足火灾安全条件的。 相似文献
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