PSI - Issue 44

Fabrizio Paolacci et al. / Procedia Structural Integrity 44 (2023) 697–704 Fabrizio Paolacci et al./ Structural Integrity Procedia 00 (2022) 000–000

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1. Introduction The Italian experience in the design of methodologies and application tools for the implementation of Bridge Management Systems (BMS) is rather new. The reason lies in recentness of studies on the static and seismic response of existing bridges (Paolacci er al. 2012, Alessandri et al 2013, Abbiati et al 2015, De Risi et al 2017, Liu et al 2017). In 2007, the ReLUIS consortium, with funding by the Italian Civil Protection, promoted a three-year project dedicated to the study of existing bridges, resulting in the publication of the guidelines and application manual for the seismic evaluation of existing bridges (Pinto et al 2009). At the same time, a virtuous example is provided by the BMS of the Autonomous Province of Trento (APTBMS), which was born from the collaboration between the Roads Management Service, Road and Railway Works Service of the Autonomous Province of Trento and the Department of Civil Environmental and Mechanical Engineering (DICAM) of the University of Trento. APTBMS is the only BMS recognized by the International Association for Bridge Maintenance and Safety (IABMAS) (Adey et al 2014). Furthermore, there are more recent and evolving realities, including Fabre University Consortium, which includes several universities and research institutions engaged in the development of actions that are still confined to the level of research and applications dedicated to bridge and viaduct safety. The enormous effort of applied research in the field of bridge safety in Italy, together with the impetus caused by the tragic collapse of the Polcevera bridge in Genova in 2018, has finally led to the publication of the guidelines of the Italian Ministry of Transportation (MIT) (MIT 17/04/2020), a document that attempts to weave the threads of research in this field, but which to date is still in the experimental validation phase. Despite the MIT guidelines provide a useful methodology to compute the static risk of bridges through a simplified assessment procedure, no specific instructions are given for the evaluation of the seismic risk. Within this framework, MLAZIO, a jointed project between the Department of Engineering of Roma Tre University and the Lazio Region, stands at the forefront of the entire national landscape since it aims to create a methodology for the static and seismic risk assessment of the bridge network of Lazio region, and to provide a regional guideline for the managing of the assets. The project will be also an important occasion to test the efficiency and robustness of the MIT guidelines applied to the Lazio region bridges. In the present paper the framework of MLAZIO project is described and the current state of progress of the activities is shown. Given its relevance in the assessment of bridges, especially in earthquake prone countries such as Italy, the attention is focused on the evaluation of the seismic risk. The idea is to provide a probabilistic method that, based on a limited number of input data (such as bridge typology, period of construction with reference to the regulations in force at the time, overall geometrical characteristics), gives a preliminary picture on the vulnerability of the regional bridge network, in order to identify the most vulnerable bridges needing deeper specific analyses. To this scope, a simplified Performance-Based Earthquake Engineering (PBEE) methodology for the quantitative seismic risk assessment is herein proposed. The main components of the methodology are described and preliminary outcomes from its application to a symbolic case study are illustrated. 2. The framework of MLAZIO project MLAZIO project aims to develop an efficient methodology for the risk assessment and economic management of the Lazio region bridges, creating the bases to build a regional BMS, starting from the prescriptions of the guidelines published by MIT (MIT 17/04/2020). Following the multi-level architecture of the guidelines, the project is divided in to six different Work-Packages (WPs) in order to develop each level described in the Italian code. The levels of analysis described in the guidelines (from level 0 to level 5) have an increased level of detail and a different number of information needed. WP1 (Level 0) aims to carry out a Level 0 analysis through the census of all bridge and viaduct types on the regional territory and their main characteristics, by collecting available information and documentation. All the information collected through the census will allow the construction of a database for the mapping of the infrastructures through a Geographic Information System (GIS) tool and the preparation of a first version of BIM models according to the different types of bridges and viaducts identified in the preliminary stages.