The critical stress in various stress levels of bending member on fire exposure for mechanical graded lumber

摘要: This study focused on the relationship between stress level and fire resistance of structural lumber. The 210 samples were prepared from 15-year-old trees Acacia mangium Forest Estate Plantation, Indonesia. Specimens 20 ® × (T) 500 mm (L) air-dried. Sixty tested under four-point bending to obtain modulus elasticity (MOE) rupture (MOR) for classifying grades remaining 150 samples. tests performed using a load position at various while specimens exposed along shear-free region. Time failure was affected by levels in an exponential trend. Despite changes level, charring rate, time failure, critical member same species similar. performance applied could be predicted simplified fire-testing methods. developed testing apparatus is valid evaluating small-scale resistant behavior lumber bending.