CIVL439/W00D476 Large glulan Engineered wood products Design Concept pick the est mem acn appncat ure Load.Resistance Load sha ng system Structural design To minimize the probability of a very high stress (extreme load case) tegeaeweicsow high stress area 19CIVL439/WOOD476 19 Defects are distributed among many laminations Large glulam beams in buildings and bridges Design values for Douglas fir glulam (MPa) Design Concept Load Strength distribution EWP occurrence distribution Load, Resistance Probability of o Probability of failure (overlap area) Strength distribution Sawn Timber Engineered wood products - pick the best member for each application I-joists laminated veneer lumber plywood finger-jointed studs oriented strandboard laminated strand lumber Structural design • To minimize the probability of a very high stress (extreme load case) occurring at a location of very low strength (extreme weakness) high stress area low strength area Load sharing systems Bridging (load sharing) Closely spaced members (load sharing)