Abstract
Fire resistance is a critical factor constraining structural safety performance, specifically for Cross Laminated Timber (CLT) structures. Due to wood being a combustible material, the exposed wood will participate in combustion, increasing the fire load density and char rates, thereby causing more severe fire risks. In order to investigate the effect of exposed wood on fire temperature, this paper summarized 32 char rate data from 11 CLT room fire tests and fitted the relationship between wood exposure area and char rate, establishes a theoretical formula for the proportion of fire load burned outside the room to the total fire load, and it also establishes a theoretical formula for the three-stage parameter fire curve, which considers the contribution of combustible materials to fire load and char rate, as well as the transition from ventilation controlled to fuel controlled during the cooling stage of the fire. The accuracy of the three-stage parameter fire curve was verified through comparison with test results. Sensitivity analysis was conducted on the main parameters that affect the three-stage parameter fire curve. The results showed that the degree of influence of each factor on the maximum temperature of the fire and the time to reach the maximum temperature was as follows: fire load density > vent height > vent width > wood exposure area.
Published Version
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