Combustion and charring properties of five common constructional wood species from cone calorimeter tests

Fast-growing wood species are unsuitable for direct use in load-bearing structures due to their loose fiber structure, low mechanical strength, and inadequate combustion performance. Traditional impregnation using low-molecular-weight resin may enhance certain characteristics but also poses environmental pollution risks. This study explores an alternative approach: subjecting Chinese fir lumbers to thermal treatment, impregnation with an inorganic solution, compression, and utilization as exposed side laminas for glulam beams. The fire performance of full-scale beams was evaluated under three-side fire exposure conditions. Results revealed that addressing the mechanical deficiencies of thermally treated wood could be achieved through 2.0 mol/L inorganic solution impregnation combined with a 20% compression ratio. The modifier weight percent gains in specimens after thermal treatment increased by 24.8% under identical conditions. Composite modification notably enhanced both mechanical and combustion properties, manifesting promising flame-retardant effects. Building upon these findings, fire-resistant laminas were created and applied to the tensile zone of the glulam beam to investigate residual bearing capacity post three-side fire exposure. After 60 min, the modified laminas-containing beam in the fire-exposed tension zone showed a 31.4% increase in residual bearing capacity over the untreated beam. This study underscores that the combined modification methods are not only cost-effective and environmentally friendly but also establish a vital theoretical foundation for safeguarding the structural safety of rapidly cultivated fast-growing wood in fire scenarios. 

Improvement in fire resistance of glulam beams containing modified laminae by thermal treatment, inorganic impregnation and compression in the fire-side tension zone

This article presents the results of a comparative experimental study to investigate the effects of using three different fire protection measures to improve the fire endurance of timber assembly. ...

Comparative experimental study of fire-resistance ratings of timber assemblies with different fire protection measures:

The fire endurance of timber beams is determined not only by the mid-span displacement,but also by the changing rate of mid-span displacement.To learn the effective factors of fire endurance such as load level,cross-section and fire retardant coating,7 specimens of 2 series were experimentally studied.The results show that,according to mid-span displacement and changing rate of mid-span displacement,the fire endurances of B100P25,B100P37.5 and B100P50 are 23,17,12min respectively,and the fire endurances of B150P50 and B150PC50 are 37 and 48min.The fire endurance of the timber beam exposed to three-side fire has an obvious decrease when the load level increases,has a prominent increase when the corss-section increases,and also has an obvious increase when the fire retardant coating is used.

Experimental research on fire endurance of timber beams exposed to three-side fire

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Experimental research on fire endurance of timber beams exposed to three-side fire