documentation and lifecycle traceability ensure that condition records, interventions, and technical evaluations support informed decisions regarding rehabilitation, life extension, or end-of-life strategies. By embedding structural oversight within institutional processes, the governance layer transforms integrity management into a proactive and accountable discipline aligned with sustainable infrastructure objectives. 4.3 Technical Integrity and Risk-Based Methodology The technical integrity layer provides the engineering foundation of the SIM framework. Its objective is to identify degradation mechanisms, assess structural performance, and prioritize interventions based on risk rather than solely on defect detection. The methodology begins with the identification of dominant failure mechanisms for each asset class, considering operational loads, environmental exposure, and historical performance. Typical mechanisms include corrosion, fatigue, cracking in reinforced concrete, settlement, and dynamic amplification effects. This analysis enables focused inspection planning and improved vulnerability assessment. Assets are then classified through a risk-based prioritization process that integrates likelihood and consequence dimensions, including safety, production continuity, environmental impact, and capital exposure. This approach is consistent with established risk-based inspection methodologies that prioritize assets according to probability of failure and consequence severity (API 580, 2016). By applying structured risk evaluation criteria, the framework ensures that resources are allocated to infrastructure elements with the highest contribution to overall risk. Where degradation is identified, structural evaluations support residual capacity estimation and remaining useful life assessment. Service life evaluation within the framework is conceptually aligned with established service life planning methodologies for constructed assets (ISO 15686-1, 2011) and supported by durability and service life prediction guidance commonly applied in structural engineering practice (ACI 365.1R-17, 2017). These analyses inform decisions regarding rehabilitation, reinforcement, operational adjustments, or continued service, reducing uncertainty in life extension strategies. By integrating inspection findings into structured decision models, the technical layer transforms condition data into defensible engineering actions aligned with sustainable infrastructure performance. These structured evaluations enable more consistent estimation of remaining useful life, strengthening the technical basis for rehabilitation, life extension, or end-of-life decision-making within a risk-informed framework.
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