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Nakon EC8: novi talijanski propisi za protupotresnu gradnju

Abstract

The 2002 Molise earthquake, which was defined by seismologists as a normal event in the geodynamics of the Italian peninsula but had an international resonance due to the collapse of a primary school, triggered a series of research initiatives in earthquake engineering and significant modifications to building codes in Italy. The modifications were completed at the beginning of 2008 with the release of a new comprehensive building code for Italy. This document was mainly inspired by Eurocode, but it contains some changes and improvements. In this paper, comments are made on three specific parts of the new code: definition of seismic action, analysis of liquefaction and analysis of slope stability. For the first part, seismic action is defined based on a recent careful study of the seismic hazard in Italy. For liquefaction analysis, some developments are given, keeping the same structure used in Eurocode. Finally, for slope stability, improvements are introduced to avoid overestimation of pseudostatic forces in conventional analyses.Iako su potres u pokrajini Molize, koji se dogodio 2002. godine, seizmolozi kategorizirali kao uobičajenu geodinamičku pojavu na talijanskom poluotoku, on je imao veliki odjek u javnosti jer je prouzročio rušenje jedne osnovne škole. Taj je događaj u Italiji inicirao mnoga istraživanja u području potresnog inženjerstva i značajne izmjene zakona o gradnji. Te su izmjene dovršene početkom 2008. godine, kada je obznanjen novi, detaljno razrađen, talijanski zakon o protupotresnoj gradnji. Taj je zakon izrađen po uzoru na Eurokod, ali donosi i neke novine i unaprje|enja. Iz tog se zakona u ovom članku komentiraju: definicija seizmičkog opterećenja, te analize potencijala likvefakcije i stabilnosti kosina. Seizmičko je opterećenje određeno na temelju nedavnih detaljnih studija seizmičkog hazarda na području Italije. Što se tiče likvefakcije, prikazane su neke novine u odnosu na Eurokod. Konačno, u vezi stabilnosti kosina unesene su izmjene u odnosu na Eurokod da se izbjegnu prevelike pseudostatičke sile u konvencionalnim analizama stabilnosti

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