Fracture of multiply-bolted joints under lateral force perpendicular to wood grain |
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Authors: | Motoi Yasumura Laurent Daudeville |
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Institution: | (1) Department of Forest Resources Science, Faculty of Agriculture, Shizuoka University, 836 Ohya, 422-8529 Shizuoka, Japan;(2) Laboratoire de Mécanique et Technologie, Ecole Normale Supérieure de Cachan, 94235 Cachan, France;(3) Laboratoire 3,5-Sols, Solides, Structures, Université Joseph Fourier, 38041 Grenoble, France |
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Abstract: | The crack initiation and propagation of multiplybolted joints subjected to lateral forces perpendicular to the grain were analyzed. Two types of bolted joint were subjected to lateral loads perpendicular to the grain. One had joints of two bolts aligned with the wood grain (type H), and the other had joints of two or three bolts aligned perpendicular to the grain (type V). The crack initiation and propagation were analyzed by means of the average stress method (ASM) and linear elastic fracture mechanics (LEFM), respectively. The maximum loads calculated by LEFM agreed comparatively well with the experimental results, and it was proved that the LEFM was an appropriate tool to analyze the fracture of multiply-bolted joints subjected to a force perpendicular to the grain. It was also found that the multiply-bolted joints failed with the fracture of the wood before the joints yielded, and that it caused a considerable decrease of the maximum loads. The reduction of strength should be considered in the design of multiply-bolted joints subjected to lateral forces perpendicular to the grain.Part of this work was presented at the annual meeting of the Architectural Institute of Japan, Hikone, September 1996 |
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Keywords: | Bolted timber joints Fracture mechanics Average stress method Yield load |
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