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1. (a) Determine the vertical displacement at point C for the truss shown in Figure 1 if two concentrated loads of P, are applied vertically downward at points G and I and a concentrated load of P2 is applied vertically downward at point H. The cross-sectional area of each member is given in parentheses (mm²) and the modulus of elasticity is 200 GPa. Consider the axial deformation only and the values of all applied loads are given 20 KN 40 KN 20 KN F (125) (125) (125) (100) (100) 4 m AZ (150) (150) (150) (125) (125) (125) (125) B D * * * 3 m 3 m 3 m 3 m Figure 1 (b) Calculate the vertical displacement at point C of the same truss as shown in Figure 1 due to temperature increase of 55°C in member AG, member BH is 10 mm too short and member DH is 6 mm too long. The coefficient of thermal expansion of the member is 1.08×105°C. Use the method of virtual work. (100) (125) (100) (100) (150)