Calculation of Supplemental Untensioned Reinforcement
Supplemental reinforcement is calculated when the "unreinforced" stress limits are exceeded, even for the structure types where it is not anticipated by IS 1343. For example, if a type 1 beam has tension stresses exceeding 0 N/mm2, it will be marked as having failed the 22.7 criterion; supplemental reinforcement will still be calculated for the type 1 beam even though the reinforcement cannot solve the failure.
The calculation of supplemental reinforcement per Note, Table 8 is as follows:
Stress Difference = Actual Stress - Supplemental Reinforcement Limit Stress
where
| As = Act [(Stress Difference) / (100 *σ)] |
| = | ||
| = | 4 N/mm2 for bonded cross sections |
User defined reinforcement that is at an angle to the cross section will only have the component perpendicular to the cross section considered.