Research On Fire Spreading Characteristics Of Timber-framed Cultural Relic Building

There are many cultural relics in Beijing,which are mostly wooden structures,and the fire load is large and the fire resistance level is low.When a fire is initiated,the burning spread rate is extremely fast,so the fire fighting work is very difficult.Because cultural relics are mostly primitive and unreconstructible,it is not realistic to use experimental methods to study their fire spread characteristics.Therefore,researchers usually use computer simulation measures.Because the pyrolysis parameters of cultural relics construction wood are quite different from ordinary wood,only the pyrolysis parameters of cultural relics construction wood can be used to make the simulation results credible and authentic,for this reason,the following work is done:(1)Based on the wood repair materials of the timber-framed cultural relic building,using the thermogravimetric experiment of wood to obtain the kinetic fitting equations and pyrolysis parameters of different pyrolysis stages,exploring the difference between the kinetic parameters of the pyrolysis reaction wood of cultural relics and ordinary wood,which provides a scientific and reliable basis for the simulation of the timber-framed cultural relic building.(2)After investigating the fire load of cultural relic buildings,this paper analyzed the fire risk and fire development process of indoor cultural relic buildings,established a typical timber-framed cultural relic building simulation model,and used the fire simulation software FDS(Fire Dynamics Simulation)to study the fire spread characteristics and its influencing factors of the timber-framed cultural relic building.(3)The influence of different fire source locations,ventilation conditions,wood pyrolysis parameters on the fire spread process of the timber-framed cultural relic building are studied,and obtains the internal temperature,visibility,carbon dioxide concentration,carbon monoxide concentration and smoke distribution.The fire spread model of the timber-framed cultural relic building is constructed.