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Behavior of Chinese larch wood after high temperature exposure: mechanical property degradation and damage constitutive model

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Document pages: 10 pages

Abstract: Wood has been widely used in ancient Chinese architecture. It is very important to understand the mechanical properties of wood at high temperature. Three tests were carried out on 102 transparent wood specimens of Larix gmelini. After exposure to different temperatures (100 ℃, 150 ℃, 200 ℃ and 250 ℃) and different exposure times (15 ℃), the residual compressive strength, tensile strength and shear strength parallel to the sample grains are the smallest, and different cooling methods (natural cooling and water cooling) are obtained for 30   min and 45   min. The results show that exposure to high temperature will greatly reduce the compressive strength, tensile strength and shear strength parallel to the grain. Whn the exposure temperatures exceed 200°C, the relative compressive strength, tensile strength, and shear strength parallel to grain decrease greatly with the increase of exposure time. The residual compressive strength, tensile strength, and shear strength of specimens after water cooling are lower than that after natural cooling. Exposure temperatures also have a great impact on the weight loss and color change of wood. Based on the test data, degradation models for the residual compressive strength, tensile strength, and shear strength of wood were developed. Furthermore, the damage constitutive model of compressive (CDMC) and tensile (CDMT) parallel to grain was established and validated reasonably by tests.

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