Numerical Simulation Of Fire-Resistance On Hollow Glass Windows

Hollowglass is widely used in modern buildings because of its advantages of light transmission,sound insulation,heat insulation and reduction of the weight of the building structure.However,in the event of a fire,the hollow glass will rupture and fall off,accelerate the spread of fire and threaten people to escape.Therefore,while hollow glass brings convenience to people,it has become one of the weakest links in fire prevention and control design.In this paper,the numerical simulation of the fire resistance on hollow glass in the absence of automatic sprinkler system and automatic sprinkler system is carried out.The fire dynamic simulation software PyroSim was used to establish a fire model of 9-story full-size residential building,the distribution of the temperature field on the hollow glass window and the height of overflow flame was obtained.And using the finite element analysis software ABAQUS/Explicit,based on the most widely used glass temperature difference failure criterion in the research of glass rupture in building fire scene,the finite element analysis model of heat transfer of hollow glass window under indoor fire is established.The surface temperature of the hollow glass window shelter area and the first rupture time in the building fire scene are obtained.First of all,according to the simulation calculation,the surface temperature of the hollow glass window shielding area was 51.8? in a building fire without an automatic sprinkler system.When there is an automatic sprinkler system and the water spray intensity is 6L/min·m2,7.50L/min·m2,10.83L/min m2,the surface temperatures of the hollow glass window shielding area are 45.3?,35.4?and 26.9? respectively.Secondly,only under the action of indoor fire source,when there is no automatic sprinkling system the hollow glass window adopts double-layer tempered glass layer and the thickness of air interlayer is 12mm.When there is automatic sprinkler system,it adopts three layers of tempered glass layer and the thickness of air interlayer is 12mm.The average time of the cracking is longer than other installation methods.Under the joint action of indoor fire source and overflow flame,the hollow glass window adopts double-layer tempered glass layer and air interlayer thickness of 12mm when there is no automatic sprinkling system and automatic sprinkler system and the water spray intensity is 6L/min·m2.When the water spray intensity is 7.50L/min·m2,the three-layer tempered glass layer is used and the air interlayer thickness is 12mm.The average time of first cracking is longer than other installation methods.The research results show that in the construction fire environment,the surface temperature of the hollow glass window shielding area is increased by 31.84? compared with the initial temperature in the absence of automatic sprinkler system,and there is an automatic sprinkler system with a water spray intensity of 6L/min·m2,7.50L/min·m2 and 10.83L/min·m2,the surface temperature of the glass masking zone increased by 25.3?9.8? and 15.4?.At the same time,the simulation results provide the surface temperature data of the shielding area for the temperature difference failure criterion of the hollow glass windows in the building fire environment,and provide the basis for the thickness of the hollow glass and the number of layers of the glass layer in engineering applications.