BENDING CREEP OF GLULAM USING SUGI LAMINAE WITH EXTREMELY LOW YOUNG'S MODULUS FOR INNER LAYERS

摘要

Bending creep tests for sugi (Cryptomeria japonica D.Don) glulam with extremely low Young's modulus laminae (3-4GPa) for the inner layers have been carried out for 4 years. For the test, 8 different composition glulam beams with the dimensions of 105mm in width, 210mm in depth and 3980mm in length were prepared. The results showed that there is practically no problem to use laminae with extremely low Young's modulus for the inner layers for both short and long term performance, and the relative creep in 50 years is much smaller than 2, which is the standard value set by the Notification No.1459 of the Ministry of Construction in Japan.