Calculation of Supplemental Reinforcement Per TR 43, 6.10.5
0.625Asfy = F1 for support regions of two-way slabs
0.625(Asfy + Apsfp) = F1 for span regions of two-way slabs
0.625(Asfy + Apsfp) = F1 for all regions of beams and one-way slabs
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It is possible that the added un-tensioned reinforcement will not be in the tension zone if a very large concrete cover is specified.
Note: For span regions of two-way slabs, and all regions of one-way slabs, this implementation is somewhat different from a literal code interpretation as it considers the possibility of a mix of bonded and unbonded tendons in a cross section. It also may require additional un-tensioned reinforcement for a cross section with bonded tendons, which the code does not require.
User defined reinforcement that is at an angle to the cross section will only have the component perpendicular to the cross section considered.
For sections with multiple concrete mixes, the minimum fcu is used to determine the limit stresses and the peak stress reported may be approximate.
No check is made to ensure the cross section is post-tensioned.