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2. For the pin-jointed truss shown in Figure Q2.1 applied at node 4. The Young's modulus E(GPa) is the same for...

2. For the pin-jointed truss shown in Figure Q2.1 applied at node 4. The Young's modulus E(GPa) is the same for the three truss vertical downward force P(kN) is a members. The cross sectional area of each of the truss members is indicated below and expressed in terms of a constant A. By using the stiffness method: (a) Compute the reduced stiffness matrix Kg [5 marks [10 marks (b) Calculate the global displacements of node 4 in terms of P, A and E (c) Calculate the axial forces in each of the truss members stating whether it is in tension or in compression in terms of P. [10 marks] 2 P (kN) (&ffz2e) G A 10 mm2 A (0428) A 2A-10 mm2 A, A 10 mm 60° 3 3 4m Figure Q2.1

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