高性能混凝土抗隧道火灾爆裂剥落研究现状综述
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摘要
首先从强度等级、湿含量、配筋率、截面尺寸和受火方式等主要影响因素入手,归纳总结了现有高性能混凝土(High Performance Concrete,HPC)抗隧道火灾爆裂剥落的研究成果,指出降低HPC湿含量可有效降低其高温下的爆裂剥落几率。其次阐述了HPC高温下的3种爆裂剥落机理及其计算方法,认为现有机理与计算方法有待完善。然后从防火涂层入手比较了HPC隧道防火措施的优劣,指出气凝胶砂浆涂层是未来隧道HPC结构防火的发展方向。最后提出了HPC隧道火灾研究的主要关键问题,包括界定高温爆裂机理的特征参数,提出基于结构全寿命周期成本理论的最优涂层技术等。
Firstly,the main factors of high temperature bursting of concrete caused by strength grade,wet content,reinforcement ratio,cross section size and fire way were summarized.The results of research on the fire extinguishing of existing high performance concrete were summarized,wet content can effectively reduce the high performance concrete high temperature burst probability.Secondly,three kinds of bursting mechanism and calculation methods of high performance concrete under high temperature were explained,and the existing mechanism and calculation methods need to be improved.And then focus on the fire retardant coating to analyze the high performance concrete tunnel fire prevention measures,aerogel mortar coating is the first choice of fire prevention measures in the future.Finally,the main key problems of high performance concrete tunnel fire research are proposed,including the characteristic parameters of the high temperature burst mechanism were defined,and the optimal coating technology based on the whole life cycle cost theory was proposed and so on.
Firstly,the main factors of high temperature bursting of concrete caused by strength grade,wet content,reinforcement ratio,cross section size and fire way were summarized.The results of research on the fire extinguishing of existing high performance concrete were summarized,wet content can effectively reduce the high performance concrete high temperature burst probability.Secondly,three kinds of bursting mechanism and calculation methods of high performance concrete under high temperature were explained,and the existing mechanism and calculation methods need to be improved.And then focus on the fire retardant coating to analyze the high performance concrete tunnel fire prevention measures,aerogel mortar coating is the first choice of fire prevention measures in the future.Finally,the main key problems of high performance concrete tunnel fire research are proposed,including the characteristic parameters of the high temperature burst mechanism were defined,and the optimal coating technology based on the whole life cycle cost theory was proposed and so on.
引文
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[18]朋改非,郝挺宇,李保华,等.普通强度高性能混凝土的高温性能试验研究[J].工业建筑,2010,40(11):27-31.
[19]闫倩倩,田波,谢晋德.含湿量和纤维对隧道二衬混凝土高温性能的影响[J].公路交通科技,2015,32(4):102-107.
[20]LIU X,YE G,SCHUTTER G D,et al.On the mechanism of polypropylene fibers in preventing fire spalling in self-compacting and high-performance cement paste[J].Cement and Concrete Research,2008,38(4):487-499.
[21]BANGI M R,HORIGUCHI T.Pore pressure development in hybrid fibre-reinforced high strength concrete at elevated temperatures[J].Cement and Concrete Research,2011,41(11):1150-1156.
[22]边松华,朋改非,赵章力,等.含湿量和纤维对高性能混凝土高温性能的影响[J].建筑材料学报,2005,8(3):321-327.
[23]黄素芬.混凝土结构在火灾中的可靠度分析[D].昆明:昆明理工大学,2012.
[24]王春华,程超.高温冷却后钢筋混凝土简支梁强度损伤的研究[J].西南交通大学学报,1992,84(2):64-74.
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[26]张威振.高温后钢筋混凝土梁的试验及其有限元分析[J].哈尔滨工业大学学报,2009,41(4):181-184.
[27]BIKHIET M M,EI-SHAFEY N F,El-HASHIMY H M.Behavior of reinforced concrete short columns exposed to fire[J].Alexandria Engineering Journal,2014,53(3):643-653.
[28]郑文忠,侯晓萌,王英.混凝土及预应力混凝土结构抗火研究现状与展望[J].哈尔滨工业大学学报,2016,48(12):1-18.
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