This cluster of papers focuses on the use of Fiber-Reinforced Polymer (FRP) composites in construction, particularly in strengthening concrete structures. It covers topics such as design-oriented stress–strain models for FRP-confined concrete, bond-slip models for FRP sheets/plates bonded to concrete, and the durability performance of FRP reinforcing bars. The cluster also explores the behavior of FRP-confined concrete under axial compression, finite element analysis of FRP-to-concrete bonded joints, and stress–strain models for concrete confined by FRP composites.