GNGTS 2022 - Atti del 40° Convegno Nazionale

334 GNGTS 2022 Sessione 2.2 FRAGILITY CURVES FOR REINFORCED CONCRETE FRAMES CHARACTERIZED BY DIFFERENT REGULARITY G. Smiroldo, M. Fasan, C. Amadio University of Trieste, Department of Engineering and Architecture, Trieste, Italy Introduction. In this work, a comparison between fragility curves developed for regular and non-regular reinforced frames is presented. The fragility curves are develop through the “Cloud Analysis“ procedure, which evaluates the structural response via Non-Linear Time History Analysis (NLTHA). Three 3D reinforced concrete multi-story frames characterized by different regularity are analysed in this work. Both maximum inter-story drift and maximum chord rotation demand capacity ratio are used as Engineering Demand Parameters, calculated by the Italian Code. To complete the develop of the fragility functions, scalar intensity measures are selected among the most referred in practice and literature, both structure independent and structure dependent. This work shows the influence of regularity in the damage levels of the buildings and the uncertainties given by the selection criteria for EDP limits necessary for a correct representation of the Limit State. Reference structures and non-linear time history analysis settings. The reference structures adopted are threemulti-storey reinforced concrete frames built with different level of regularity. The first structure, called “Regular Frame” (“RF”) is characterized by a square plan of 15m width, subdivided in three bays with 5m length each. A strength class C20/25 was adopted for concrete, while steel bars type B450C as defined by the Italian Building Code are used. Fig. 1 - Frames.