A framework for field inspection and condition assessment of FRP-reinforced and FRP-strengthened concrete bridge elements

The increasing use of Fiber-Reinforced Polymer (FRP) composites in bridge infrastructure presents both opportunities and challenges for structural inspection and asset management. Although FRP systems offer superior corrosion resistance and high strength-to-weight ratios, their distinct material behavior and deterioration mechanisms are not adequately addressed in existing bridge inspection standards. This study presents a comprehensive framework for the field inspection and condition assessment of in-service FRP-reinforced and FRP-strengthened concrete bridge elements, developed in a research project funded by the Federal Highway Administration (FHWA). The framework integrates findings from experimental evaluation, nondestructive testing (NDT), and literature synthesis to produce a standardized methodology compatible with the Specifications for the National Bridge Inventory (SNBI) and the AASHTO Manual for Bridge Element Inspection (MBEI). It introduces FRP-specific element identifiers, defect typologies, and condition-rating scales consistent with national bridge data structures, enabling quantitative evaluation and uniform reporting across transportation agencies. The framework represents a foundational step toward incorporating composite materials into the federally mandated bridge management systems established under 23 CFR 650.317, facilitating data-driven maintenance, lifecycle analysis, and policy development.