Structural Fire Performance of Tall Timber Building Under Probabilistic Compartment Fire Scenarios

This paper proposes a framework for the structural fire performance evaluation of a ten-storey timber building subjected to probabilistic compartment fires. First, the compartment fire scenarios are designed based on probabilistically distributed fire load density, opening factor, and fire growth rate. Subsequently, the numerical models for the sequential thermal-structural analysis are developed. For the fragility assessment, the equivalent section temperature (EST) is selected as the engineering demand parameter (EDP), and the fire load density is shown to be a more effective intensity measure (IM) than the opening factor. The fragility assessments are carried out for both thermal and structural responses. For the thermal response of the timber column, the one-zone model is used to generate fire temperature curves, and four damage states were defined by EST thresholds. For structural response, the fragility curves of the structural collapse are computed based on different compartment fire locations.