Question: 3. By using the Virtual Work principle; determine the vertical displacement of joint D on the truss. Each A-36 steel member has a cross-sectional

3. By using the "Virtual Work" principle; determine the vertical displacement of joint D on the truss. Each A-36 steel member has a cross-sectional area of A = 300 mm2. E = 200 GPa 3 m 20 kN 4 m D E 3 m B 30 kN

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