Purpose: Used to define slab reinforcement steel.
--> Given in girder input
A list of distances (inches or mm) by interior supports for the centroidal location of reinforcement as measured from the bottom of the slab. If only one value is given, that value is used at all interior supports. Default is bottom bar cover of 2.5 inches or 63.5 mm plus two thirds the distance between bottom bars and top bars, corresponding to the assumption two thirds of the longitudinal reinforcement is in the top layer with a top cover of 2.5 inches or 63.5 mm.