Model code approach to the SLS design of FRP reinforced concrete elements

Though research on FRP reinforcement has led to the development of several design recommendations over the past 25 years, recent efforts have focused on the development of unified design procedures and models that can account for the effect of both conventional steel and advanced FRP reinforcement. Examples of such efforts are testament to the level of maturity reached by this novel reinforcing solution and will facilitate a more widespread adoption of FRP reinforcement. The relatively lower modulus of elasticity of FRP materials compared to steel reinforcement may lead to large strains, crack widths and deflections, and as a consequence the design FRP reinforced concrete structures is often governed by serviceability requirements. This paper outlines the principles underlying the recommendations for the serviceability limit state design of FRP reinforced concrete structures included in the next generation of Model Code, discussing merits and limitations as well as comparing to other relevant proposals.Support provided by Spanish Ministry of Science and Innovation (MCIN/ AEI) and by European Funds for Regional Development through projects PID2020‐119015GB‐C22, RTI2018–097314-B-C21 and PID2021-123701OB-C21 is acknowledged.Postprint (published version