Camber

Analysis Effects

Deflection due to p/s in walls is computed as part of the total initial bow which is defined as the deflection due to p/s (camber) plus the additional bow as input by the user. The total initial bow is used to determine the initial shape of the panel prior to any restraints being applied.

Open

Figure 1: Diagram showing restraint locations for a panel with no initial bow (left) and restraint locations for a panel with initial bow (right)

Applied Prestressing Loads

The prestressing strands are converted to applied loads acting on the member. At each analysis point an axial load and a point moment is computed and applied to the member. For a beam-spring system these loads are added to each wythe individually. For a system using the % composite method, these loads are computed based on a fully composite section. These internal forces are applied to a simply supported panel and deflections are computed. The prestressing forces assume 15% losses when computing the camber at erection. This assumed loss is also used for transfer lengths.