How do you analyze prestressed concrete members for different load stages?

Prestressed concrete analysis considers multiple stages: (1) Transfer stage - when prestress is applied, check concrete stresses with initial prestress and self-weight only, (2) Service stage - full prestress minus losses plus full service loads, check allowable stresses and cracking, (3) Ultimate stage - factored loads with reduced prestress, check flexural and shear capacity. Prestress losses include elastic shortening, creep, shrinkage, relaxation, friction, and anchorage slip. Analysis uses transformed section properties and compatibility of strains at ultimate.