Title: Determining modulus of elasticity of ancient structural timber
Author: Zhang, Houjiang; Zhu, Lei; Sun, Yanliang; Wang, Xiping; Yan, Haicheng
Source: Advanced materials research. Vol. 217-218 (2011): p. 407-412.
Description: During maintenance of ancient timber architectures, it is important to determine mechanical properties of the wood component materials non-destructively and effectively, so that degraded members may be replaced or repaired to avoid structural failure. Experimental materials are four larch (Larix principis-rupprechtii Mayr.) components, which were taken down from the drum-tower of Zhengjue Temple of Yuanmingyuan (Old Summer Palace), Beijing, China. The larch components were cut into standard specimens first, and then stress wave transmission times, resistograph and densities were tested. Product of resistograph and stress wave speed squared is defined as modulus of stress-resistograph. Comparing with the modulus of elasticity (MOE) of the specimens tested by the traditional bending test method, it is found that there is a linear relationships between the modulus of stress-resistograph and modulus of elasticity (MOE), and the correlation coefficients are 0.7111. In order to better evaluate the modulus of elasticity (MOE) with the modulus of stress-resistograph, 95% confidence regression lines are suggested to be used for the future calculation.
Keywords: Ancient timber architecture component, modulus of elasticity, MOE, stress waves, resistographs, modulus of stress-resistograph, larch, elasticity, mechanical properties, bending, wood quality, flexure, nondestructive testing, wood defects, structural analysis, regression analysis, buildings, maintenance, wooden-frame buildings, wooden buildings, China, building materials, wood deterioration, historic buildings, building conservation, building restoration, Larix principis-rupprechtii, antiquities, ancient timber, structural timbers, log quality, bending strength, wood decay, wooden temple
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Zhang, Houjiang; Zhu, Lei; Sun, Yanliang; Wang, Xiping; Yan, Haicheng; 2011. Determining modulus of elasticity of ancient structural timber. Advanced materials research. Vol. 217-218 (2011): p. 407-412.
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