Abstract
A probabilistic model was developed for predicting the bending strength of 5 ply glulam (beam depth: 10-12cm) by using the distribution of the modulus of elasticity (MOE) of laminae.
A random number generation method assuming that the relationship between the MOE and the modulus of rapture (MOR) of a lamina was represented by a weighted regression line and a standard error was proportional to the square root of the MOE was used in the model. In order to validate the model, a distribution of bending strength of twenty eight kinds of 5 ply glulam (four species, seven arrangements of laminae) was predicted, and the results were compared with the actual test data.
Kolmogorov-Smirnov (K-S) tests were conducted to ascertain the compatibility between the predicted and the actual bending strength of the glulam. In twenty three predictions out of the twenty eight, a null hypothesis “The actual test data could be the samples from the predicted distribution”. were rejected over the 20 percent critical value.
