Fragility curves assessment of an existing typological RC building subjected to the combined action of slow-moving settlements and earthquake

The seismic assessment of reinforced concrete (RC) structures is commonly carried out ne- glecting potential previous damage induced by other phenomena, for example those related to the actions of slow-moving settlements. Many efforts are dedicated by the research communi- ty in properly considering multi-hazard actions and their inter-relations on the structure, in- stead of a reductionist approach, to be included in the numerical models adopted for the assessment of the seismic vulnerability. Such a consequences are increasingly becoming an important issue in the structural assessment, since several structures have an age close to, or higher than their design life. In this work a typological 3D case study RC building, including also infills, is created according to gravity loads design. The seismic assessment of the build- ing structural elements, caused by the design seismic action, is initially shown. Then, the seismic assessment is repeated, considering as point zero of the analysis the “damaged” building as consequence of known slow-moving settlements. Finally, an interesting compari- son in terms of fragility curves is proposed between the safety condition of the building ex- pected in both cases, with or without the consideration of the precedent induced displacements.