| Aspect | NTC 2008 (Previous Code) | NTC 2018 (Current Code) | | :--- | :--- | :--- | | | Based on outdated data | Updated with new seismic hazard maps that better reflect Italy's active geology | | Structural Analysis | More generalized approaches | More precise modeling, particularly for seismic combinations on non-dissipative structures | | Materials (Reinforced Concrete) | General distribution of reinforcements | More rational distribution of rebars, especially in node zones, leading to tighter stirrup spacing where needed without a global increase in reinforcement | | Masonry Structures | Less detailed mechanical parameters | Revised and expanded methodologies for determining mechanical parameters for both new and existing masonry buildings | | Existing Buildings | Less prescriptive | More detailed and nuanced criteria for assessing and retrofitting existing structures, including minimum seismic vulnerability indices for schools | | Prefabricated Structures | Base requirements | Retains the 2008 framework but adds new specific requirements for joints and connections, which were a critical point of failure in past earthquakes |
– This chapter is the philosophical heart of the code, outlining the performance-based design approach. It specifies the limit states that must be verified: Ultimate Limit States (safety of people) and Serviceability Limit States (comfort and durability). ntc 2018 english version