RESTAURO SISMICO CONSERVATIVO.

Storia, tecnica e sostenibilità economica dell’isolamento sismico alla base.

Abdul Kader Moussalli, Daniele Di Luca, Margherita Pauletta

Università degli Studi di Udine, Dipartimento di Ingegneria Civile e Architettura, Via delle Scienze 206, 33100 Udine, abdulkader.moussalli@gmail.com

ABSTRACT

The restoration and conservation principles for masonry cultural heritage buildings are often not compatible with correct antiseismic design requirements. In fact, the use of conventional methods leads, in most cases, to retrofitting interventions showed excessively invasive or ineffective. This conflict has been unfortunately demonstrated by the relevant damage found in a large case of structures, restored after earthquakes but again seriously struck by subsequent seismic events. On the bases of those simple statements, a different approach to the question has been pointed out, which consist in the use of “modern”, however old and forgotten, antiseismic techniques that reduce the dynamic actions transmitted by the earthquake, avoiding the increase of the structural resistance. After a short state-of-the-art, an historical analysis of Villa Lippomano and the nearby chapel of St. Nicolò, and an analysis of the critical elements for their mechanical behavior, the paper defines an innovative intervention technique for seismic protection of masonry cultural heritage buildings. Pilot application of Base Isolation by means of a specific sub-foundation system, in order to respect as better as possible the building original features is proposed. The new hypotheses is implemented in the paper and the main steps of the preliminary long standing work and his economic sustainability are discussed.

Key-words: Seismic Isolation, Architectural restoration, Heritage buildings, Conservation, Economic sustainability.