Energy dissipation and equivalent damping of RC columns subjected to biaxial bending: an investigation based in experimental results

摘要

The cyclic behaviour of reinforced concrete columns have been object of many experimental studies in therecent past years. However, the experimental studies on the biaxial response of RC columns are still limited. Inthis paper are presented the main results of an experimental study of 24 full-scale rectangular building columnstested for different loading paths under uniaxial and biaxial conditions. The experimental results are presentedand discussed in terms of global behaviour, particularly focusing on the stiffness and strength degradation due tothe increasing cyclic demand, and energy dissipation evolution. The equivalent viscous damping was estimatedbased on the experimental results of the RC columns tested under biaxial loading and empirical expressions are proposed.