Abstract
An experimental study on the bending creep behaviour of full-size douglas-fir glulam beam was made under non-controlled sheltered environment for 9 years for the purpose of clarifying the efficient way of defining creep deflection curve in relation to the load duration. Two experiments were carried out at stress level of 0.3 and 0.5, which is the ratio of bending stress to static bending strength. The latter concluded creep failure after 4 years loading. In this paper, the results of these experiments are presented. For formularizing the creep deflection curve, it is necessary that the load duration should be at least more than one and a half year, but at the same time it is to be desired that first six months data is ignored. After 9 years loading of stress ratio of 0.3, unloading was made, and it showed that the flexural rigidity remained unchanged.
