3. Draw the shear-force and bending-moment diagrams for the beam shown by the area method.(25％)

2. A tubular beam ACB with a length of L = 1.5 m is pin supported at its ends, A and B. A powered winch at E lifts load W below C using a cable which passes over a frictionless pulley at midlength (point D). The distance from the center of the pulley to the longitudinal axis of the tube is d = 140 mm. The cross section of the tube is square with an outer dimension of b = 15 cm, area of A = 125 cm2, and moment of inertia of I = 3385 cm4. Determine the maximum tensile and compressive stresses in the beam due to a load W = 13.5 kN.(20%)

3. Draw the shear-force and bending-moment diagrams for the beam shown by the area method.(25％)

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