What i mean is the sagging and hogging moment capacities used in calculation of shear force(refer clause 6.3.3 pg.4 IS13920-1993) should be plastic moment capacities( without factor 1.4).
code considered plastic moment capacity = 1.4 X elastic moment capacities.
the factor of 1.4 is intended to account for the actual yielding condition and increased tensile strength due to possible strain hardening and marigin of safety.
STAAD allowing user to take plastic moment capacities or 1.4 times elastic moment capacities by PLASTIC parameter.