WP5 aims to summarize, harmonize, and propose a methodology to compute seismic demand induced on the NSCs in structures of different typologies and to improve the current seismic codes. It is organized into two Tasks, whose activities are summarized below.
Task 5.1 – New practice-oriented procedures for the FS evaluation
This Task will address the results of WP3 and WP4 to the definition of new practice-oriented procedures to compute the filtered seismic input induced to acceleration-sensitive NSCs. The proposed methodology will refer to the FS approach. The proposed tool must be able to: correctly consider the amplification induced on NSCs varying the lateral LRS; properly quantify the amplification induced in the elastic phase and its modification with increasing nonlinearity; accurately describe the influence of the parameters investigated in WP2, WP3, and WP4. The methodology will have rigorous theoretical bases, but at the same time, it will be easy-to-use, since it wants to be a tool for practitioners, easy to implement in technical codes and guidelines.
Task 5.2 – Improvement of current seismic risk classification criteria including NSCs
The proposed methodology will be also applied to the development of another tool aimed at the definition of “seismic risk classes” under seismic action accounting for NSCs. Recently, public policies supporting interventions on existing buildings for seismic risk mitigation proposed a simplified loss-oriented approach resulting in the definition of "seismic risk classes”. A more detailed and explicit analysis of the influence of NSCs on this classification would represent a very timely development. To this aim, the proposed methodology for the assessment of seismic demand on NSCs will be applied adopting a simplified parametric approach; the latter is based on a limited number of predictors of the seismic response (e.g., structural typology, number of stories) and a given set of seismic intensity levels, that – along with a simplified capacity assessment of the considered NSCs based on main current code provisions and literature studies – will allow the definition of “critical” NSCs and the consequent indication of strengthening interventions needed for a significant risk decrease, which will be linked to an upgrade in seismic risk class. These results will be integrated with the current Guidelines for seismic risk classification.