Solve the grid structures shown in Figures P5-52 through P5-57 using a computer program. For grids P5-52-P5-54, let E = 30 × 106 psi, G = 12 × 106 psi, I = 200 in.4, and J = 100 in.4, except as noted in the figures. In Figure P5-54, let the cross elements have I = 50 in.4 and J = 20 in.4, with dimensions and loads as in Figure P5-53. For grids P5-55 through P5-57, let E = 210 GPa, G = 84 GPa, I = 2 × 10-4 m4, J = 1310-4 m4, and A = 1310-2 m2.

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3 3000 lb 5 10 ft 10 ft 10 ft-