The Ratio of Working Stress to Allowable Stress on Structural Members of Wooden Houses V.

In case of using glued laminated timber graded to “E55-F200” as beams of houses built in an area of average snowfall

Abstract

The ratio of working stress to allowable stress on beams replaced with glued laminated timber graded to E55-F200 was investigated in three wooden houses which were build in an area of average snowfall. Due to a decrease of Young's Modulus of the replaced beams, it was found that existing flexure on some beams exceeded the flexure limit. However, there were no beams exceeding the allowable stress for bending strength and shear strength. For some beams exceeding the flexure limit, it was also suggested that sufficient safety margin for the flexure limit can be gained by increasing the beam height by 30 mm or 60 mm.