Abstract
This study evaluates the risks of roof collapse for three types of roofs designed for 1-h fire resistance performance: a roof system with a purlin, a roof system without a purlin, and a unit roofing system without a purlin. The roof system with the purlin and the unit roofing system satisfied 1-h fire resistance performance, however, the roof system without the purlin did not. It was determined that the roof systems with and without purlin were at risk of casualties owing to the rapid increases in deformations after 30 min in the fire experimental test. The maximum deformation of the unit roofing system was larger than that of the other systems. However, because the deformation over time showed a linear behavior, the risk of collapse owing to the rapid increase in deformation was considered to be the lowest.
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