对地铁隧道敷设用铸铁管的防火试验结果进行了热分析,并对其合理防火性能和预设定耐火性能进行了分析

A. Garashchenko, A. Danilov, S. Antonov, S. V. Marchenkova, V. Pavlov
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引用次数: 2

摘要

介绍。本文论述了地铁隧道用铸铁管的防火极限。这些结构既没有在我国进行过防火测试,也没有在国外进行过,因此没有对防火测试结果进行分析,尽管这种分析是保证结构性能所必需的。目的和目标。本研究的目的是分析两个火灾实验的结果,包括对没有防火的铸铁管的测试,以及对有防火板保护的管的测试。研究的目的是选择和使用合理的热分析方法。一种标准化的方法被应用于测试在火炉中加载的全尺寸油管试样的耐火性能,其中测试试样的热电偶测量被采取。对这些测量结果进行了热分析,采用了防火结构内部一维和二维非稳态温度场数值计算的方法和软件。经试验确定,不加任何防火措施的5.6-25-NU铸铁管在恒静载(150kn)下的耐火极限为54分钟,对应等级为r45;而同样的管,经proask防火板(25mm厚)防火后,耐火极限至少为121分钟,对应等级为r120。如果考虑到测试环境和油管工作环境之间的差异,计算可以预测耐火性的变化。作者给出了各种防火方案的计算结果,表明如果使用proask防火板,铸铁管的防火极限和耐火极限都很高。作者还证明了如果暴露模式与标准温度模式不同,耐火值的可投射性。通过对铸铁管材作为隧道衬砌的耐火性能进行两次火灾试验结果的热分析,为地铁关键结构的防火和预设定耐火性能提供了必要的信息,并为进一步开展这一领域的实验和理论研究提供了依据。作者论证了热计算作为一种评估管道防火参数/耐火性能的工具的有效性,并减少了昂贵的火灾试验次数。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
The thermal analysis of fire test results obtained for loaded cast iron tubing used to line subway tunnels, their rational fire protection and pre-set fire resistance
Introduction. The article addresses the fireproofing limit of the cast-iron tubing that lines subway tunnels. These structures have been fire tested neither in our country, nor abroad, and therefore, no fire test results have been analyzed, although this analysis is necessary to guarantee structural performance.Purpose and objective. The purpose of the study is to analyze the results of two fire experiments, including the testing of the cast iron tubing without fire proofing, and the testing of the tubing protected by a fireproof plate. The objective of the study is to choose and use a rational thermal analysis methodology.Methods. A standardized methodology was applied to test the fire resistance of loaded full-scale tubing specimens in a fire furnace, where thermocouple measurements of tested specimens were taken. The thermal analysis of these measurement results was conducted, using the methods and software for the numerical calculation of non-stationary temperature fields inside fireproof structures in one- and two-dimensional settings.Results. It has been established that the fire resistance limit of the 5.6-25-NU cast-iron tubing tested under constant static loading (150 kN) without any fire protection is 54 minutes, which corresponds to classification R 45, while the fire resistance limit of the same tubing, fireproofed by PROSASK fire panel plates, that are 25 mm thick, is, at least, 121 min (R 120). Calculations allow to prognosticate a change in the fire resistance, if account is taken of the difference between the test environment and the one of the tubing when in operation. The authors present the results of calculations for various fire protection options and show that the fire protection and fire resistance limits of the cast-iron tubing are high, if PROSASK fire plates are used. The authors also demonstrate the projectability of the fire resistance values, if the modes of exposure differ from the standard temperature mode.Conclusions. The thermal analysis of the results of two fire experiments, conducted to evaluate the fire resistance of the cast-iron tubing as the tunnel lining allows to obtain the information that is essential for the fire protection and pre-set fire resistance of critical subway structures as well as the further development of this area of experimental and theoretical research. The authors demonstrate the efficiency of thermal calculations as an instrument for the evaluation of fire protection parameters/fire resistance of tubing and the reduction in the number of costly fire tests.
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