Answer:
In STAAD, if you use IS:13920 code for designing beams and columns, the program would internally follow all the provision of IS:456-2000 code and it would follow the extra requirements of IS:13920 code. The shear force of beams to be resisted by vertical hoops shall be maximum of the following (as per cl-6.3.3 of IS:13920-1993).
- Calculated factored shear force as per the analysis. (This means that in the analysis if you have a load combination of gravity load with the stipulated factor, shear force for that has to be considered. In case, you have a load combination of 1.5(DL+LL). So shear force for this load combination has to be considered.)
- Shear force due to formation of plastic hinges at both ends of the beam plus the factored gravity load on the span.
For the provisions mentioned in (b), you need to calculate equivalent UDL for gravity load case. In this regard, you need to use EUDL parameter to define Equivalent UDL on the span of the beam. The value must be unfactored. It would be multiplied by a factor of 1.2. If you don't define the UDL value, factored shear force due to gravity load on the span is taken as zero and no plastic and elastic moments would be calculated. The shear design would be performed on the basis of that analysis result only. If you don't define the EUDL parameter, you can use GLD parameter for the same purpose. You can combine DL + LL without any factor and define that Load Combination as GLD parameter. The unfactored load is being multiplied by a factor of 1.2 at the time of design.