On the prediction of shear brittle collapse mechanisms due to the infill-frame interaction in RC buildings under pushover analysis

•The infill panel-frame interaction is investigated within pushover analyses.•The “double-strut model” is adopted to simulate the infill behavior.•The activation of local brittle collapse mechanisms is studied.•The goal is to provide a practical tool for the prediction of shear demand.•Dangerous shear failures compromising the structural safety can be detected.