The Longitudinal reinforcement tab allows you to define the parameters of longitudinal reinforcement of an RC member according to the ACI 318 codes.
 Required Reinforcement of Beams/Columns - Options 
 Calculation Parameters 
			  to open the Calculation Parameters dialog, and then click 
			 
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Bar diameters can be different for top and bottom reinforcement of a beam. Similarly, a column can have reinforcement along h and b sides.
If the same diameters are used for the entire element then The same type of bars for both directions option should be selected.
The cover can be calculated as a cover to axis or clear cover of bottom reinforcement. Cover values are converted automatically.