I am wondering is there any permanent torsion limit for buildings specified in the codes? for example how much a concrete building is allowed to twist permanently (due to foundation twist or structural plasticity) after very strong earthquakes or other extreme loads in different directions causing structural torsion? For permanent lateral drift, the limit is 1% for MCE shaking but cannot find anything for acceptable level of permanent twisting angle due to torsion.
Behzad Fatahi,
I have not come across to an explicitly defined torsional rotation limit in the building design codes that I used before (Uniform/International Building Code and Turkish Code).
I think the closest penalty due to torsional deformation limit that you search for is the torsional irregularity factor that amplifies the total earthquake force acting on a structure. In the extreme torsional irregularity case (ASCE-7), the design may be prohibited unless the torsional irregularity is reduced to a certain level.
Regards,
Atila
Hello Dear Professor,
A file address attached below is a study about torsion in concrete building in Chalmers University.
Best Wishes
https://core.ac.uk/download/pdf/70574784.pdf
- Badges
- Science topic