Unique Aspect in Strength Design of Post-Tensioned Structures

The tension force in unbonded strands that is used in the Whitney Stress Block, is determined by multiplying the section area by the fps value. Two equations are used to calculate fps and are separated by the span to depth ratio. Unlike rebar only concrete which has a constant fy value, fps is constantly changing along each span and can often switch equations within the same design strip. These creates unique numerical situations that will look odd, challenging to explain and need to be better understood by the engineer to avoid confusion in the office and on the drawings. The role and rationale behind compression reinforcement in flexural strength will also be addressed.

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11:00 AM – 1:30 PM PT