PSI - Issue 62

Elisa Spallarossa et al. / Procedia Structural Integrity 62 (2024) 241–249 Elisa Spallarossa, Giuseppe Pasqualato/ Structural Integrity Procedia 00 (2019) 000 – 000

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5.2. The BIM model of the structure for inspection purposes As mentioned above, the BIM models of the structure made for project purposes used for the pilot project were adapted for “inspection” purposes following Sina agreements on the definition of the elements subjected to the inspection. The information data managed and filed in SIOS were entered as parameters for both the characterization of elements and the definition of deterioration on the Digital Twin of the structure. The data model (AIM - Asset Information Model) was structured specifically to enable the management of information deriving from inspection activities, and can anyway be integrated for the design phases setting specific information sheets for each element. More specifically, the data model enables the: • free modification, deletion and management of categories, regardless of the categories imposed by specific software (authoring programs); • organization of information based on the reality of the Client to be shared with the entire Sina supply chain; • compliance with Regulations in terms of OpenBIM and open formats. The result of this activity was the definition of guidelines and operating instructions for the creation of models for inspection purposes and developed with a view to implementing the methodology on the structures managed by Sina with the SIOS system. This procedure makes it possible to use Sina database information for a parametric modelling of structures. Such activity is currently being developed to digitize entire highway agencies parts putting modelling for "inspection use” into practice. The setting of a standard repeatable procedure guarantees the optimization of resources and has the objective of achieving a first uniform modelling of all the viaducts of the highway Agency on the basis of certain and documented information. This first setting is strategic in view of their use according to the “LOIN” (Level of Information Need) principle, i.e. integrating and modifying models with geometric, information and documentary data based on the BIM Uses necessary depending on the single bridge and analyses or projects envisaged. 6. Asset management One of the main tasks is to produce a collaboration system for infrastructure network management. The results of the pilot project have been extended to an entire highway agency company of highway bridges and the SIOS system is currently being developed further to: - systematise the results of the pilot project, - define the selection criteria of maintenance interventions based on the results of visual inspections; - determine the maintenance budget based on various maintenance and restoring scenario hypotheses. SINA employs its own method - SIOS - to perform inspection activities, which envisages the punctual deterioration recording (type, extension, severity and position) of each typical element of the bridge (or of any other structure) and the assignment of a specific deterioration level indicator for each element and for each subsequent element (Index Value - VI) aggregation level (both physical, per span and structure, and logical, per structural type of the element and spans) which finally defines the condition of the bridge via an attribution value. Such value, concerning the single structure, helps compare all the works part of an infrastructure or of other infrastructure networks. As part of the in depth analysis of the project, a comparison analysis and mapping were carried out between: Index Value (VI); Relative Defectiveness (RD), defined by the Guidelines For The Classification And Management Of Risk, The Assessment Of Safety And The Monitoring Of Existing Bridges. Such analyses were carried out to provide SIOS developers with a parameter for the correspondence and determination of service statuses supporting the Bridge Management System to be integrated within SIOS itself. After multiple in-depth analyses and tests, the Index Value (IV) was adopted as a first setting of the BMS to define the deterioration levels of bridge elements, anyway leaving the possibility of shifting such input from Index Value to Relative Defectiveness (RD). The reason for such choice lies in the fact that the data for the definition of the Index Value are processed using a logarithm formula which, with respect to the relative defectiveness (RD) defined in the guidelines of the Ministry of Transport for safety bridges, appears more exhaustive for the incorporation of inspection data into the records of service.

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