PSI - Issue 62

Fabrizio Paolacci et al. / Procedia Structural Integrity 62 (2024) 732–737 Author name / Structural Integrity Procedia 00 (2019) 000 – 000

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The plastic displacement Dmax, relative to the considered PGA, is determined from De,max, depending on whether the structure is in the equal displacement or equal energy field, following the established theory of the method N2 described in the codes. However, a simplified procedure for evaluating Dmax relative to the PGA of interest is considered herein. Following the recommendation of Pinto et al. in 1996, the value of the demand Dmax can be quickly determined using Eq. (4): ሺ ሻ = ሺ ሻ ∙ (4) ʹ SDOF system curve

Fig. 3. a) Evaluation of “D

max ” b) Bilinear pushover capacity curve

4. Conclusions This paper provides an overview of the MLAZIO project structure and its current status, introducing a novel seismic risk assessment methodology. A collaboration between the Department of Engineering at Roma Tre University and the Lazio Region, the project aims to establish the methodological foundations for a Lazio Region Bridge Management System (BMS). This system will encompass the classification, management, evaluation, and monitoring of bridge safety. The project adopts a multi-level approach based on the Italian guidelines (MIT 17/04/2020) and incorporates innovative tools such as satellite monitoring, Building Information Modeling (BIM), Geographic Information System (GIS), and expedited methods for the quantitative assessment of both static and seismic risks. A new methodology for expeditious quantitative seismic risk assessment is herein proposed to complement the Level 3 prescription of the guidelines. This methodology allows for the rapid evaluation of seismic risk index for bridges in the Lazio region by leveraging the hazard curve of the site and utilizing a simplified Finite Element Model (FEM). The proposed pushover analysis of the structure facilitates the assessment of bridge capacity, and through a simplified closed-form equation, it becomes possible to determine the mean annual frequency of exceeding a specific limit state.

Acknowledgements The research leading to these results has received funding from Lazio Region in the frame of MLAZIO project.