Discussion on “Effects of multiple earthquakes on inelastic structural response”

A discussion on the paper by Di Sarno (2013) is presented. The paper is focused on the inelastic response of degrading single-degree-of-freedom systems and a two-story two-bay reinforced concrete frame subjected to 5 seismic sequences recorded during the 2011 Tohoku earthquakes. While the subject to the paper is timely and the author point out some important issues about the problem, this discussion offers some comments about the nonlinear response of structures under seismic sequences (or multiple earthquakes) in order to enrich our current state of knowledge.