CIVL439/WO0D476 Cracks caused by shrinking Cracks caused by shrinking Temperature effects on Clear Moisture and Temperature Wood Interactions 1。★★★南女女古十 马，,-ag- Effect of SG on ear Wood .Douglas fir 0.51 ·western hemlock 0.4 western larch 0.61 .Engelmann spruce 0.425 pole pine 0.455 0.367 1 10 CIVL439/WOOD476 10 Cracks caused by shrinking • In glulam beams – possible crack distribution Courtesy of Dipl.-Ing. Philipp Dietsch Univ.-Prof. Dr.-Ing. Stefan Winter Technische Universität München ©Stefan Kühn f t,90 σc,90 σt,90 Benediktbeuern, MPA BAU) Cracks caused by shrinking • In combination with fasteners – crack distribution Courtesy of Dipl.-Ing. Philipp Dietsch Univ.-Prof. Dr.-Ing. Stefan Winter Technische Universität München (Feldkirchen, Prof. Winter) (Freiligrathstr., Munich, MPA BAU) Temperature effects on Clear Wood [1 ( )] ET2 = ET1 −α T2 −T1 Moisture and Temperature Interactions Specific Gravity of Common Softwood • Douglas fir 0.51 • western hemlock 0.47 • western larch 0.61 • Engelmann spruce 0.425 • lodgepole pine 0.455 • balsam fir 0.367 Oven dried Volume of Wood Density of water Oven dried Weight of Wood SG 1 × − − = Effect of SG on Clear Wood Strengths R2 = 0.88 (air dried) R2 = 0.81 (green)