REPAIR, REHABILITATION, AND RETROFITTING STRATEGIES FOR STRUCTURAL INFRASTRUCTURE: MODERN APPROACHES AND PERFORMANCE ASSESSMENT

The longevity and reliability of infrastructure are increasingly critical due to aging constructions, evolving usage patterns, and modern safety standards. This paper reviews contemporary strategies for repair, rehabilitation, and retrofitting of structural systems. Emphasis is placed on modern materials, performance-based interventions, and post-repair monitoring techniques. Surface repair, section enlargement, bonded plate strengthening, and advanced retrofitting approaches using Fiber Reinforced Polymers (FRP), steel, and reinforced concrete jacketing are discussed. The paper also evaluates comparative performance metrics between steel and FRP retrofits, highlights structural performance modeling, and presents monitoring techniques such as acoustic emission, digital strain mapping, electrochemical corrosion scanning, optical fiber sensing, and ultrasonic tomography. The study provides insights for selecting cost-effective, sustainable, and resilient interventions for existing infrastructure.