End joint with glued-in hardwood dowels in large section column timber, 1: Effects of moisture contents on withdrawal properties
2004
Fujita, M. (Ehime-ken. Forest Experiment Station, Kawauchi (Japan)) | Koizumi, A. | Sasaki, T. | Iijima, Y. | Higuchi, S. | Harada, K.
The application of glued-in hardwood dowels to end-jointing of large section column timbers was considered. In this study, pull-out tests were made using sugi ( Cryptomeria japonica ) and 12mm diameter dowels (Acer saccharum ) to investgate the effect of moisture content (MC) of the wood member on withdrawal properties. Withdrawal strengths and slip modulus by pull-out tests tended to decrease as MC increased. The gradient of regression line between the moisture content of the wood member and withdrawal strengths and slip modulus for double dowels was smaller than that for single dowels. Although differences between average withdrawal strengths of MC <= 20% and average withdrawal strengths of MC > 20% for single dowels were significant, the results for double dowels were not significant.
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