3. (20 points) Consider the composite beam illustrated in fig. 3. The beam is comprised of...

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3. (20 points) Consider the composite beam illustrated in fig. 3. The beam is comprised of wood and steel, as shown in the cross-section view, along with the dimensions. Assume that Ewood = 15 GPa and Estool=240 GPa. (a) Determine the maximum normal stress in the wood, due to the loading shown. (b) Indicate the location of the maximum stress in the wood. 100 N/m I 5m Figure 3 Solution: (a) (50, -25) = -3.719 kPa, (-50, 25) = 3.719 kPa. (b) Bottom left and top right corners of wood section. 100 mm Steel Wood 215 mm 120 mi 30 mm 50 mm mm 3. (20 points) Consider the composite beam illustrated in fig. 3. The beam is comprised of wood and steel, as shown in the cross-section view, along with the dimensions. Assume that Ewood = 15 GPa and Estool=240 GPa. (a) Determine the maximum normal stress in the wood, due to the loading shown. (b) Indicate the location of the maximum stress in the wood. 100 N/m I 5m Figure 3 Solution: (a) (50, -25) = -3.719 kPa, (-50, 25) = 3.719 kPa. (b) Bottom left and top right corners of wood section. 100 mm Steel Wood 215 mm 120 mi 30 mm 50 mm mm