The truss is constructed from three aluminum alloy members, each having a cross-sectional area of A = 1150 mm² and an elastic modulus of E= 69 GPa. Assume a = 2.8 m, b = 9.4 m, and c = 4.1 m. If the horizontal displacement of roller B must not exceed 6.2 mm, calculate the maximum vertical load Pmax that can be supported by the truss. L. a P b B

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