PREDICTION OF FIRE EXPOSURE AND CHARACTERIZATION OF THE BURNING BEHAVIOR OF WOOD FOR THE DESIGN OF A REAVY TIMBER 'FIREPROOF BUILDING' UNDER LOCALIZED FIRE SCENARIO

摘要

Prediction of fire exposure due to a localized fire scenario and measrement of materiel properties of wood for the fire safety design of a large timber-based railway station as a "Fire-proof Building" is reported. The current Japanese building regulation for "Fire-proof buildings" reqvires autonomous extinction of fire before the collapse of any of load-heasing memhers due to fire anticipating the difficulty in the availability of fire fighting at the event of a post-eexthquake fire. The building featuring long span heavy timber arches supported by steel tresses was designed end finally approved as the first timber-based "Fire-proof building' within this Japanese building regulation framework assuming local ignition on load-bearing member. The study consists of the prediction of the fire exposure of loed hearing timher members dee to Wain fires, investigation of the possibility of autonomous extinction at different levels of external heating with bench-scale test apperatoses and evahutfon of the influence of design features and configurations on the herning behavior using an intermediate scale radiant penel The Jagnneee Cedar was found to be self-extingnishable under only limited level of fire exposure and some design details originally proposed by the architect were found to lead to an umcontrolled burning of the timber components. The building design was coordinated to reduce the fire exposure to the Iced beefing timber members within the extent allowing the autonomous extinction The study presents basic framework for the forther development of the fire safety design and materiel properties for timber-based "Ftreproof buildings".