Structural Behavior of Reinforced Concrete

Reinforced concrete structures—bridges, columns, parking garages—weaken over time as steel corrodes and loading demands grow beyond original design assumptions, making cost-effective rehabilitation a persistent engineering challenge. Fiber-Reinforced Polymer composites, which are lightweight, high-strength materials made from carbon, glass, or aramid fibers bound in a resin matrix, have emerged as a practical way to wrap, plate, or rod-reinforce existing concrete members and restore or even exceed their original capacity. Researchers work to understand exactly how FRP and concrete interact under load, developing stress–strain models for confined columns and bond-slip relationships that describe how FRP sheets peel away from concrete surfaces—knowledge that feeds directly into design codes. Open questions center on long-term durability of FRP in wet or alkaline environments, on reliably predicting behavior under combined loading scenarios, and on translating laboratory findings into standardized guidelines that practicing engineers can confidently apply.

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Keywords

Fiber-Reinforced Polymer CompositesConstructionConcrete StrengtheningFRP Confined ConcreteStructural RehabilitationBond-Slip Models