How do I model a large sweep bend with radius = 50ft?
Assuming the bend has supports along it then model the bend as series of straight pipe run sections with offsets calculated as a segmented miter bend. Alternatively enter the bend with radius = 50×12 = 600 inches (for ENGLISH units, by overriding the word Long or Short in the radius field. Radius units is displayed in the lower right of the main AutoPIPE window) and insert soil over the large bend with large value of downward soil stiffness, vertical up and lateral stiffness = 0, longitudinal stiffness = 0 (or some nominal value to include some frictional resistance).
