On the question whether the volume of glulam bending members changes their reliability

According to Eurocode 5 rules [1], the characteristic bending strength of glulam may be increased for member depths h less than 0.6 m to benefit from the volume effect. For depths greater than 0.6 m, the bending strength is assumed as constant value, although it seems logical that the volume effect should also be considered, at least to a certain extent. For this purpose, the depth factor kh given in Eq. (1) was proposed [2].