3. A two-dimensional truss shown in the figure is made of aluminum with Young's modulus E =...

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3. A two-dimensional truss shown in the figure is made of aluminum with Young's modulus E =

80GPa and failure stress ay = 150 MPa. Determine the minimum cross-sectional area of each member so that the truss is safe with safety factor 1.5.

60 kN Pin joint 9 cm Roller support

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