Bending strength of large Japanese larch glued laminated timber

摘要

We conducted bending tests on large dimension structural glued laminated timber (glulam)composed of Japanese larch (Larix kaempferi, Carriere) lumber. The specimens were beams of twodifferent dimension types. The first 7 beams were all 600[mm] deep and 150[mm] wide. The othersof 7 were all 800[mm] depth and 150 [mm] wide.The difference between mean MOE of 24-ply and 32-ply glulams was very small (10.39 and 10.49kN/mm 2,). On the other hand, the mean MOR of 24-ply and 32-ply glulams was 28.2 and 31.8N/mm 2, respectively. The larger glulams were stronger than the smaller ones, and the test results forMOR were not consistent to so-called size effects (or depth effects) based on the weakest-ling theory.This phenomenon may be caused by the difference in failure modes between the two types. But thepredicted values calculated with the prediction model proposed by Mori et al agreed with the testsresults.