Fragility curves for rc framed buildings subjected to earthquake-induced landslide: comparison between 2d and 3d structural models

Earthquake-induced landslides are strongly dangerous secondary events of earthquakes, which every year cause huge losses around the world. In this paper, the structures at the toe of slopes subjected to the impact of landslides were considered. A probabilistic procedure developed in another paper is applied to two-story reinforced concrete building without infill walls. A method to evaluate cumulative damage to structures due to earthquake shaking and landslide impact was implemented through MATLAB. The variability in landslide-related loading, in terms of extension in plan and impact angle, was considered. A 2D frame was taken out from a 3D model and sequential response analysis was carried out on both models through OpenSees. Uncertainties were modelled through probability distributions of primary variables that mostly influence structural response, allowing the derivation of fragility curves via simulation. The probability of collapse was investigated under varying peak ground acceleration and impact velocity, which were considered as intensity measures for earthquake shaking and landslide impact, respectively.