Analisi di VULNERABILITA’ SISMICA di un CAPANNONE industriale prefabbricato in c.a. mediante differenti analisi

The earthquake that has struck in 2012 territories of Emilia region with high concentration of precast industrial building, have highlighted the fragility of this typology of construction. If on one hand they have exhibited in the past to be one of the most efficient structural solutions for vertical loads, on the other hand they showed to be very sensitive to the effects of horizontal actions. In this regard, in the areas affected by the strong May 2012 earthquakes, most of the existing structures were designed to support the horizontal wind action and not the seismic one, prescribed by regulation only recently in these areas. In the present work, we reported the results of the seismic vulnerability analysis of an industrial reinforced concrete precast building, achieved by dynamic analysis on a finite element model designed to be as close as possible to the real structure, in terms of stiffness, mass and strength distributions. Particular attention was put, during the modelling, at the choice of the finite element for simulating the connections between the structural elements and between structural and non-structural elements, in order to capture relative displacements or possible sliding phenomena. Both spectral response dynamic analysis and non-linear time-history were conducted, obtaining different safety levels. The results obtained were finally commented.