On the evaluation of local response spectra according to the Italian design code

The definition of a seismic action for the structural re-analysis of existing buildings requires generally consists in the assignment of a response spectrum. The Italian design code offers a simplified procedure to account for amplification effects from site conditions. However, when considering cultural heritage buildings a more accurate determination of the local spectrum could be of interest, given the need to effectively protect these assets and the restoration principles and the consequent conservation requirements that impose strict limitations to interventions that may be performed. The main aspects of the procedure adopted for the evaluation of local response spectra are here recalled, and results are presented for three sites having different stratigraphic conditions and hosting museum buildings. Finally, the results from the simplified procedure and from a complete geophysical analysis are compared.