Evaluation of the fire endurance of mechanically graded timber in bending |
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Authors: | Anita Firmanti Bambang Subiyanto Shuichi Kawai |
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Institution: | (1) Research Institute For Human Settlements, Jl. Panyaungan-Cileunyi Wetan, Bandung, 40008, Indonesia;(2) Research and Development Unit for Biomaterials, Jl. Raya Bogor Km 46, Cibinong Bogor, 16911, Indonesia;(3) Research Institute for Sustainable Humanosphere, Kyoto University, Uji 611-0011, Japan |
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Abstract: | AbstractThis study examined the performance of mechanically graded timber in bending when exposed to fire at various load
ratios. The test specimens were 150 pieces, each with the dimensions of 60 × 120 × 3500mm. The modulus of elasticity (MOE)
of 150 specimens was measured, and 60 among them were selected to formulate the prediction equation for MOE and modulus of
rupture (MOR), which was used to predict the remaining 90 specimens. These were tested under fire exposure in bending using
three-point loading at 11.1%, 16.7%, 33.3%, 66.7%, and 83.3% of the ultimate load. Using mechanically graded timber, which
means acknowledging the actual strength of the bending member, permits fairly precise application to the targeted design load.
This research confirmed that mechanically graded timber under fire exposure has the following tendencies: under the same load
ratio, time to failure is independent of strength class, and, at any load ratio, the critical strength is dependent on the
timber strength class. The obtained design bending strength under fire exposure using the reduced cross section method and
the reduced strength method conformed to those calculated based on Eurocode 5. Following those findings, mechanically graded
timber can be applied to obtain the design bending strength when taking into account the fire attack. |
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Keywords: | Mechanical stress graded timber Bending Fire endurance Critical stress Acacia mangium |
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