Energy-based procedures for seismic fragility analysis of mainshock-damaged buildings

In recent decades, significant research efforts have been devoted to developing fragility and vulnerability models for mainshock-damaged buildings, i.e., depending on the attained damage state after a mainshock ground motion (state-dependent fragility/vulnerability relationships). Displacement-based peak quantities, such as maximum interstory drift ratio, are widely adopted in analysis define both engineering demands structural capacities at global and/or local levels. However, when considering ground-motion sequences, use of quantities may lead statistical inconsistencies (e.g., curves’ crossings) due inadequate consideration accumulation. this context, energy-based demand parameters (EDPs), explicitly accounting cumulative damage, can help address issue. This paper provides an overview findings development aftershock-fragility buildings. Particular focus is given state-of-the-art frameworks analyses based parameters. Moreover, literature review indices concepts approaches earthquake reported better understand main advantages mostly parameters, well their limitations. Different refinement levels seismic response derive relationships buildings also discussed. Finally, benefits adopting EDPs rather than, or addition to, state-dependent demonstrated reinforced concrete frame building. Specifically, refined lumped plasticity modeling approach adopted, sequential cloud-based time-history Multi-Degree-of-Freedom (MDoF) model carried out. The results highlight that effectively capture accumulation during sequences without obtained models. On other hand, estimating capacity terms still challenging. Further experimental data needed calibrate quantification damaged states.