RAM Concept Help

Section 18.7 Design Flexural Resistance (Prestressed)

See Section 10.2 Factored Moment Resistance (Non prestressed) . Note that if axial forces are included in the design (per the design span or design section setting), then the diversion of post-tensioning forces into supports will cause a hyperstatic (secondary) tension in many design sections, as is appropriate.

Post-tensioning Tendons are included.

Bonded tendon strains are calculated using strain compatibility (see detailed description Relationship of Bonded Post-tensioning Strains to Cross-Section Strains ).

If a tendon is not perpendicular (in plan) to the cross section under consideration, then vector components of the cross section strains and the tendon stresses are used.

Unbonded tendon stresses are calculated using a strain reduction factor (see detailed description Unbonded Post-tensioning Stress-Strain Curves – Program Implementation ).

If tendon centroid is closer to the extreme compression fiber than the compression reinforcement, a solution may not be possible.