Rework problem 3.74, but select a standard pipe cross section instead of a square box cross section?

Refer to Problem 3.74,

For the barrel vault truss shown, use a computer program to design the truss. That is, based on the most critical compression member and most critical tension member, select a square box ASTM A36 steel cross section based on either Euler's or Johnson's formula for buckling as relevant or maximum allowable yield strength in tension. Use a factor of safety of 3 based on yield strength or critical buckling load or stress. Document your work and show critical hand calculations. Also list the largest three nodal displacements and their locations on the truss. Include a plot of the deflected shape of the truss and of the principal stress, both in color.

Figure P3-74 Barrel vault truss (coordinates are shown in units of feet)

2 kip (21, 10.5) |1 kip 2 kip (16.5, 8.25) 1 kip (25.5, 8.25) 2 kip (14.5, 7.25)| (27.5, 7.25), 2 kip kip (20, 8) (16, 7)(26, 7) (22, 8) (8, 4) (34, 4) (15, 4) (27, 4) (42, 0) (14, 0) (28, 0) (8, 0) (34, 0)