For common buildings in areas with high seismic activity, torsion is a quite dangerous stress condition, because:
a) It is a statically determined stress. This means that if a failure occurs there is no possibility for transition to another static state.
b) The rotations caused to the beam due to creep are relatively large thus leading to large slab deflections.
c) Failure is caused by shear stresses therefore, it is of a brittle nature and consequently there are no signs for the impending failure.
d) It is not easy for the technicians to understand that the formwork of the elements under torsion must not be removed in the usual time. On the contrary, the formwork must remain in place until the following-phase-casted-concrete that affects these elements has adequately hardened.
e) Reinforcing of beams subjected to torsion follows special rules. In order to apply these rules, one does not only require thorough knowledge but also extreme care during the construction.