Discussion of an Evaluation Method for Mode I Fracture Toughness and Bending Strength Perpendicular to Grain with Structural Glulam

作者：Kambe Wataru^*; Iijima Yasuo

来源：Mokuzai Gakkaishi, 2010, 56(3): 149-159.

DOI：10.2488/jwrs.56.149

• structural glulam
• stastical analysis
• fracture toughness
• bending strength

In the latest articles, the strength of bolted connections loaded perpendicular to the grain have been studied with fracture mechanics To estimate the strength of such connections, we need sonic material properties. e g. fracture toughness and bending strength perpendicular to the grain (the properties used in the previours papers) However, the test method for bending strength was not described, and the number of test samples was insufficient Therefore, evaluation of the data for construction design and establishment of a database is important In this study. we conducted CT tests. three-point bending tests for the strength perpendicular to the grain and block shear tests Additionally we analyzed the data by statistical methods As a result. the 5% lowest value based on two-parameter Weibull distribution with 15% of the lower data is the towel of all statistical methods The 596 lowest value based on the normal distribution and the two-parameter Weibull distribution with 1596 of the lower data. and the 5th percentile value based on ISO13910 are lower by all methods Next the average value and standard deviation of model fracture toughness and bending strength perpendicular to the grain, by strength grading of three wood species. arc presented in this paper

• 出版日期2010