Aging of Wooden Components in Ancient Timber Structures. Fire Risk and Smoke-Heat Hazards
Based on the aging characteristics of wooden components, this study adopted artificial accelerated aging and fire propagation apparatus (FPA) to examine how aging affects the combustion behaviour, fire risk, and smoke-heat hazards of pine wood commonly used in ancient structures. Wood specimens with dimensions (100×100×10 mm and 300×100×10 mm) matching fire performance tests were prepared, and artificial accelerated photoaging treatment was conducted to obtain aged samples with 0, 60 and 120 aging cycles in accordance with the accelerated aging test protocol for wood materials. The results indicate that pine combustion involves three distinct thermal stages: pyrolysis, smouldering, and flaming, with critical high-risk transition points identified. Aging intensified fire risk and related hazards across all stages, particularly accelerating flame spread on vertical components.