隧道火灾消防射水对混凝土抗压强度的影响  

Effect of Fire Fighting Water on Compressive Strength of Concrete in Tunnel Fire

作　　者：王珍[1] 李固华[2] 张泽江[3] 黄涛[1] 

机构地区：[1]西南交通大学地球科学与环境工程学院,四川成都610031 [2]西南交通大学土木工程学院,四川成都610031 [3]公安部四川消防研究所,四川都江堰611830

出　　处：《西南交通大学学报》2011年第2期223-227,240,共6页Journal of Southwest Jiaotong University

基　　金：国家"十一五"科技支撑计划资助项目(2006BAK06B06);公安部消防局科研项目

摘　　要：为探讨隧道火灾消防射水对高性能混凝土(HPC)力学性能的影响,对试件外观特征随火场温度变化的规律进行了试验研究,分析了消防射水对HPC残余抗压强度的影响,建立了火灾后HPC残余抗压强度与火场温度之间的关系.研究表明:消防射水对隧道火灾后HPC残余抗压强度的影响很大;在自然冷却条件下,HPC的残余抗压强度总体上呈衰减趋势,300℃时略有升高;在射水冷却条件下,HPC的残余抗压强度始终衰减.在相同温度条件下,射水冷却比自然冷却时HPC的残余抗压强度低,后者最高约为前者的1.3倍.In order to investigate the influences of fire fighting water on the mechanical properties of HPC（high perfomance concrete） in a tunnel fire,the variation of the characteristics of samples with fire temperature was researched experimentally,the effect of fire fighting water on the residual compressive strength of HPC was analyzed,and the fitting relationship between the residual compressive strength and fire temperature was given.The research results show that fire fighting water affects the residual compressive strength of HPC greatly.Generally,under a natural cooling condition,the residual compressive strength of HPC decreases with temperature raising,but goes up slightly at 300 ℃.Under a water injection cooling condition,the residual compressive strength of HPC decreases all the time.Under the same temperature,the residual compressive strength is lower under the water injection cooling condition than under the natural cooling condition,and the greatest residual compressive strength under the natural cooling condition is 1.3 times of that under the water injection cooling condition.

关 键 词：隧道火灾 消防射水 高温 高性能混凝土 残余抗压强度 

分 类 号：TU528.34[建筑科学—建筑技术科学]