Accidental Torsion Modelling
Accidental Torsion Modelling
(OP)
How is the accidental torsion modelled, say, in a 3D steel frame (RISA/STAAD)? Is it more appropriate to apply a force couple, or a nodal moment? Which is most common?
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Accidental Torsion Modelling
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RE: Accidental Torsion Modelling
If the programs are automatically generating the building mass for you (based on applied gravity loads) and applying the seismic resultant force at the centroid, I would take that resultant, multiply it times the required eccentricity, then place a moment at the centroid to represent the accidental torsion (one case for the resultant being at each side of the centroid, if you are confident in the program resultant). Actually, I would expect the programs to allow you to enter the accidental eccentricity to be considered.
I am just not sure how you made the model or the options in each program. But make sure you don't apply the force/torsion twice, one internal to the program and one input by hand.
RE: Accidental Torsion Modelling
Regards,
Lutfi