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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6.1. Maintenance operations definition workflow To determine the interventions necessary to restore elements based on the condition state defined by visual inspections, specific flow diagrams are prepared to illustrate the process, to be translated into computer programming. The structure of the flows is made up of various steps, featuring the parameters contained in the guidelines for bridge safety useful to determine the nature of the viaduct. The procedure to select the BMS interventions (work candidates) to be developed inside SIOS envisages the identification of the structural type of the bridge to be analysed as a first selection criteria. Such process starts with the identification, for each bridge selected, of the reference scenario to develop BMS criteria. The combination of material, span and static scheme determines the vulnerability class of the viaduct as illustrated in the guidelines for bridge management, as per figure below. As for the average daily traffic, such information is entered into the selection criteria as it can be useful to identify the strategy to be adopted (limitation of lanes, closure of the section, etc.). Once the vulnerability class is identified, the analysis of elements that make up the viaduct is carried out, determining the condition state of each according to the index value and the related intervention actions.

Fig.5 Maintenance, Repair and Rehabilitation Vulnerability classes data flow determining the selection criteria of maintenance interventions – (text in italian) The reference scale of condition states is the same for all vulnerability classes. The IV variation fields, which define intervals, can vary between classes. Such fields have bee, by now, identified only for the MEDIUM class, while they still need to be defined for the other vulnerability classes. They can be defined depending on the most urgent interventions, at the discretion of the highway agency. The data supplied by SINA identify the different service statuses of each element depending on the extension of the defect. The definition of the Index Value variation fields for the other vulnerability classes, depending on the corresponding restoring and/or replacement actions deemed appropriate, will be defined following the development of the first BMS prototype made by SINA developers. On these bases, the analysis of the elements that make up each structure corresponds to each vulnerability class as well as the subsequent determination, for each of them, of the service status according to the Index Value, based on which the various interventions are hypothesised. Flows are planned to define the “trigger events” for the selection of the maintenance interventions on the different elements inspected visually. The structural vulnerability class affects the selection of maintenance interventions, making it possible to adjust the planning based on the service status and vulnerability class. The objective of the implementation of SIOS inspection data processing is to provide a decision-making system to choose maintenance and/or replacement actions based on the bridge vulnerability class and condition states.