Study on Damage Mode and Crack Expansion Characteristics of Compression Damage of Dou-Gong in Hall-Style Wooden Architecture Based on DIC： a Case Study of the Great Compassion Hall of Chongshan Temple

Le résumé fourni par la source

This paper is aimed to study the applicability of digital image correlation （DIC） technology in the protection of wooden cultural relics and the complex damage characteristics of the Dou-Gong under compression due to wood anisotropy. Firstly， new woods were used to verify the applicability of DIC in the mechanical properties testing of wood， and then DIC technology was applied to the replaced original components of the Dou-Gong of Chongshan Temple to obtain its compressive elastic constants， and its surface strain field evolution and crack extension process were analyzed based on DIC. The results showed that： 1） DIC had better reliability and robustness in wood testing， the average value of the deviation of the elastic modulus from the results by the traditional method was 8.29%， and the average value of the variation coefficient of each parameter was 8.07%； 2） the compressive elastic parameters of the arch timber were measured by DIC， and the proportional limiting strengths and elastic modulus ratios of the longitudinal and tangential directions were 9.51 and 24.56， respectively； 3） the compressed specimen surfaces of the Dou-Gong timbers in the longitudinal direction produced transverse and oblique vertical composite splits and diagonal splits， the radial direction produced out-of-face compression bending and shear diagonal cracks， and overall compression bending occurred in the tangential direction； 4） crack evolution showed a three-stage characteristic， with a growth rate of the maximum crack length of longitudinal direction specimens appearing in the crack macroscopic stage of 1.35 mm/s， and the growth rates of the maximum crack length in the radial direction and the tangential direction appearing in the crack expansion stage， of 2.08 mm/s and 0.94 mm/s， respectively.

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