温湿度条件の異なる集成材はりの曲げクリープ特性

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This report describes the bending creep behavior of Glulam under three different environments. These three conditions were: constant-environment (constant temperature and humidity), natural-environment, and high humidity-environment. This study compared the bending creep behavior under the three environments and showed the relationship between the temperature and the bending creep. As a result of the comparison the following conclusions were found. 1) Creep under high humidity environment was 2 times higher than the creep under the constant environment. 2) Estimated value of the bending relative creep was more than 200% after 50 years. This deformation was higher than the deformation defined by the "Standard for Structural Design of Timber Structures". Consequently we realized that we must be cautious about the bending creep deformation of high humidity-environment. 3) Although the averages of temperature and humidity for the natural-environment were the same as for the constant-environment, the bending creep deformation under natural-environment was 10% higher than under constant-environment. Therefore the variations of temperature and humidity were the cause of an increase in the bending creep deformation. Hereafter we need to investigate the bending creep under changing temperature and humidity. Using a method of dividing first creep and second creep parts proposed by us in a previous paper we obtained a good estimated value of the creep effect, which confirmed the validity of the method.
一般社団法人日本建築学会の論文
2003-03-20

温湿度条件の異なる集成材はりの曲げクリープ特性

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