The difference from the singly Reinforced section would be the following. Based on the code I am using the three main parameters are needed. the cracking moment, the second moment of area and the location of the neutral axis .
The cracking moment is determined from elastic analysis ( working stress method ). And the formula you use in order to obtain is the normal bending stress formula( since we only consider deflection due to bending moment ). The neutral axis location is calculated using the transformed area method.
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