Stress estimation of roof axial members based on the release strain measured at demolition of the Japanese wooden traditional old temple

• Published in: Journal of wood science Vol. 60; no. 6; pp. 403 - 413
• Main Authors: Yamasaki, Mariko, Uchida, Miyuki, Torichigai, Toshiya, Sasaki, Yasutoshi
• Format: Journal Article
• Language: English
• Published: Tokyo Springer-Verlag 01.12.2014; Springer Japan; Springer Nature B.V
• Subjects: Axial stress; Bending stresses; Biomedical and Life Sciences; Buildings; Characterization and Evaluation of Materials; Demolition; Disasters; Dismantling; durability; Finite element method; Life Sciences; Materials Science; Maximum bending; Modulus of elasticity; Original Article; Pinus densiflora; Strain measurement; Stress waves; Structural analysis; Structural members; Two dimensional analysis; wood; Wood Science & Technology; Japan; Stress wave velocity; Young’s modulus; Release strain by demolition work; Traditional architecture; Stress estimation
• ISSN: 1435-0211; 1611-4663
• DOI: 10.1007/s10086-014-1425-z

In Japan, there are many large-scale old wooden buildings which show good durability. These buildings are subjected to external forces of various strength, including several disasters throughout the years. This study aims to understand the structural features of such old buildings by examining the stress state of their structural members. Targeting the dismantled old roof frame of a temple, measurement of Young’s modulus on its members using the stress wave method was performed, as well as measurement of the strain of the members during the demolition, and these results were used to conduct structural analysis. Using the velocity of the strut and the girder, the average Young’s moduli of both members were estimated to be 12.3 and 11.1 kN/mm², respectively. From these values and the strain measurement values, when removing 83 % of the total load of the roof frame and roof, the average vertical stress of the strut was estimated to be 4.4 N/mm²; the bending stress of the girder was estimated to be 3.1–5.9 N/mm². These values were matching with the values of 2D-FEM analysis. Furthermore, it was suggested that the maximum bending stress of a girder could be 117 % of the allowable stress of Japanese red pine.