This is done because the web depth of the section may vary along the length of the span and independently of cross section. This variation may be linear, parabolic, elliptic, or in steps. The cross section at any point along a span is a combination of the properties of the section and the web depth at that location. Using a library utility program, the user may modify the geometry of the existing sections, add new sections, or delete existing sections. Stage construction may be modeled by respective cycles of the system for girder configuration and load application.
Cycles are automatic if desired.
The dead load of structure members is automatically calculated if desired. Additional distributed loads and point loads may be applied in groups and each group assigned to a specific construction stage. Distributed loads may be uniform or tapered and divided into sections to model sequential slab pours. Loads due to prestressing are calculated and applied internally. A truck may have up to 24 axles.