Abstract
In the seismic design of buildings affected by torsion, and advanced proposition was made in the recently revised national building code that the strength of each story of building should be enhanced according to the extent of torsional component of vibration. The provision may be deemed to be a measure which enables to reduce the increase of damage due to torsional effect. The amplification factor for the required strength was designated by the Fe-value. However, the physical meaning of the Fe-value is still obscure. The authors have tried to estimate the effect of torsion on the damage distribution of the structure through inelastic response analyses on buildings affected by torsion. Based on the result of analyses, a parallel expression of the Fe-value is proposed.
