as I am quite unexperienced with Sofistik - especially with composite structures - I tried to comprehend how Sofistik calculates the plastic design values shown in the table below.
The bending Moment My is quite logical for me. (As far as I know they use the “Gesamtquerschnittsverfahren” described in EC 4)
But now I am struggling with the shear force Vz. Till now I always thought that the resistance of a composite beam was reduced to the shear force resistance of the steel joist (what in this case would be 2632 kN for a HEM 800)
This is clearly not the case. For this reason I assume, that the concrete brings in an additional load-bearing capacity.
So my questions are:
- Why is this the case if there is no reinforcement at all
- Is there any way to recalculate by hand the given values in the table?
- Can I change something in the Input so that Sofistik just takes into account the “steel part”
Thank you very much!