異なる自然環境下における信州産カラマツ大断面集成材はりの曲げクリープ特性

概要

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The bending creep tests of Japanese larch glued laminated timber beams for large-scale wood constructions were conducted under uncontrolled conditions for two years and three months in four regions of Nagano prefecture. The dimension of the tested glulams was 150 mm width, 600 mm depth and 10,700 mm length. The bending span (distance between supporting points) was 10,000 mm. The applied load was 44.1 kN, which should be approximately equivalent to long-term allowable stress. The obtained results were as follows. 1.The bending creep behavior of the large dimensional glulam beams shows the same tendency of small and middle dimensional glulams, for example the seasonal fluctuations of the creep deflections were observed, and so on 2. The variation of temperature and moisture in a day effects on the creep deflection. Because the larger the variation was, the more the deflection has increased. 3. The Young's modulus of the creep-tested beams was no decreasing after the long term test in two years and three months. 4. We can estimate the creep deflections of large dimension glulam beams by the power law. And the estimated creep deflections after 50 years of large dimension glulam beams were small as half of specified deflections by the standard for structural design of timber structures
一般社団法人日本建築学会の論文
2006-03-20