2) A rigid beam AB rests on the two short posts as shown. Post AC is made from steel and has a diameter of 20 mm. Post BD is made from aluminum and has a diameter of 40 mm. Assume E = 200 GPa for steel and E = 70 GPa for aluminum. Determine the displacement (mm) of point F for a vertical load of 90 kN. A 90 kN 200 mm F -400 mm B D 300 mm

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The truss is constructed from three aluminum alloy members, each having a cross-sectional area of A = 800 mm² and an elastic modulus of E= 70 GPa. Assume a = 3.4 m, b = 10.9 m, and c = 4.5 m. If the horizontal displacement of roller B must not exceed 6.4 mm calculate the maximum vertical load Pmax that can be supported by the truss. C L₂ a Answer: Pmax= P b KN B

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