BASIC SOFT COMPUTING TOOLS FOR THE IMPROVEMENT OF THE ITALIAN AFTER EARTHQUAKE DESIGN PROCEDURES
Former PhD student: Dipartimento di Ingegneria Civile ed Ambientale, Università degli Studi di Perugia, Italia
This work is the very first step of a research project whose goal is introducing soft computing techniques in the Italian state of the art decision making procedures for structural recovery of buildings. It is the result of the experience gained by the author in designing structural intervention over 10 RC and masonry buildings damaged by the 2009 L'Aquila earthquake. Although the method described here may have general value in civil engineering, the point of view of buildings retrofitting is useful to illustrate a situation in which structural designers must operate within precise external limitations. After the L'Aquila earthquake, for the seismic improvement of buildings with “usability outcome E” (or “building unusable”, according to the classification given by the Italian Presidenza del Consiglio dei Ministri (PCM) 2009.b), considering the regulatory guidelines expressed in the documents “OPCM n. 3790 del 2009” (PCM 2009.c) and “Indirizzi per l'esecuzione degli interventi di cui all'Ordinanza del Presidente del Consiglio dei Ministri n. 3790 del 17.7.2009“ (PCM 2009.a) was mandatory. In few words, within the complex regulatory framework determined by these three and other legal acts, two specific conditions emerge for the designer to be in compliance with for the seismic improvement of structures with capacity lower than 60% of regulations demand: the first one is about structural performance; it can be evaluated as the ratio between the capacity peak ground acceleration (PGA) and the demand PGA for the life safety limit state (in Italian indicated as “SLV”), both calculated according to technical standards in force (Ministero delle Infrastrutture 2008 & 2009). The second condition is a limitation of cost of intervention per square meter.
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