The influence of fire size on breakage time for double glazed curtain wall system in enclosure fire

The prediction of breakage time on curtain wall system is an important factor for the fire protection system in high-rise buildings. The breakage of glass is caused by thermal deformation of curtain wall frame. Also, thermal deformation could be influence by fire size. Therefore, in this study, numerical analysis is performed to investigate the effect of fire size on breakage time on double glazed curtain wall system. To investigate the effect of fire size on breakage time, the pool size is varied 0.4x0.4 m, 0.5x0.5 m and 0.6x0.6 m, respectively. As a result, the breakage times of glass are decreased as 170 s, 100 s and 38 s for the pool size varying 0.4x0.4 m, 0.5x0.5 m and 0.6x0.6 m, respectively. From the numerical results, the present study suggests the useful relationship between the heat release rate and breakage times as follow: t = -0.341×Q e + 257.64 (252.3 kw < Q e < 637.9 kw). In order to prevent breakage of glass curtain wall due to fire, fire protection system must be operated