Monitoring steel bridge degradation with multi-criteria approaches

Introduction/purpose: The objective of this work is to formulate a Fuzzy Analytical Hierarchy Process (FAHP) method that can assist specialists in conducting inspections of steel bridges. Fuzzy logic approaches are preferred due to their ability to handle uncertain information in ways that mirror human reasoning processes, making them particularly suitable for structural damage assessment applications. Methods: The procedure is organized in a hierarchical framework consisting of 35 criteria and sub-criteria. This structure is designed to assist the project's inspection stakeholders in making decisions. The weights Wi of these criteria are established by utilization of the FAHP, supplemented by expert evaluations, in order to compute the comprehensive performance indicator CPI score that represents the extent of damage to the bridge being examined. The structure is categorized based on its overall CPI score using the IQOA notation. Results: To rigorously evaluate the practical applicability and accuracy of the developed FAHP methodology, a real-world case study was undertaken. The methodology was applied to assess the health condition of the steel bridge situated in Oued Taria, located within the Mascara region. The application of this comprehensive approach yielded results that demonstrated remarkable consistency and strong alignment with previous, independently conducted expert assessments of the same structure. Conclusion: The successful application and validated results unequivocally affirm the scientific efficacy and practical utility of this FAHP-based tool. It serves as a robust and reliable decision-support system, significantly enhancing the capabilities of experts in accurately assessing the complex and often subjective aspects of damage in steel bridges. This methodology not only streamlines the inspection process but also contributes to more objective and consistent evaluations, ultimately leading to improved maintenance planning and enhanced safety of critical bridge infrastructure.