1st mode is torsion

[Baha]

Hello.. In the reinforced concrete structure that I designed with 4-storey hollow slab, the periods are long and the torsion mode appears in the 1st mode. Although there is no problem in the reports, would it be correct to allow the periods to be as long as 1.15 seconds in a 4-storey structure and the 1st mode to be torsion?

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[unver]

Hello

The periods of the reinforced concrete structure that I designed with 4-storey hollow slabs are long and the torsion mode appears in the 1st mode. Although there is no problem in the reports

You need to add an unbalanced shear according to Article 4.3.4.6 in the rollover control of your project. Unver ÖZCAN

 

[miralay]

The fact that the periods are long is due to the fact that the regulation reduces the section rigidity. You can play around a bit with element orientations and cross sections to reduce torsion.