PROBLEMS OF MODELING FOR THE ANALYSIS OF THE SEISMIC VULNERABILITY OF EXISTING BUILDINGS

In the moment in which Italy is crossed by several earthquakes  the  evaluation of seismic vulnerability  for existing buildings assumes a paramount  importance.  The  assessment  of  an  existing  building  must  be  preceded  by  an  investigative  phase  in  which  geometry, characteristics of structural elements, structural details, reinforcement ratio non-structural element must be known. An important role is also demanded to the modelling of the structures in plastic range, therefore, to perform  a  realistic  seismic  analysis  of  non-seismically detailed RC structures, it is important to have models to capture the hysteretic behaviour  of  beams, columns  and  joints.  The  problems being addressed in this paper regard the development of models for realistic assessment of seismic behaviour of non-seismically detailed R.C. frame structures with reference to beams, columns and joints. To this scope a R.C.  frame non-seismically detailed adopted as study case has been properly modelled and analysed by both non-linear static and dynamic analyses. A  critical  discussion  about  the optimal modelling of R.C. structures is also reported.

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Rosario Montuori, Elide Nastri and Vincenzo Piluso