Probability-based design for FRP reinforced concrete structures: A critical review and research NEEDS

Until now, several design guidelines have emerged for concrete members reinforced (or strengthened) with fiber reinforced plastics (FRP). These guidelines have greatly advanced the application of FRP as reinforcement in engineering structures. But the basis for these design guidelines has not been solidly formed yet. Most of resistance factors in these guidelines have been modified simply from those of steel reinforced concrete structures. A significant variance among these factors can be observed. Due to sharp differences of mechanical properties between steel and FRP materials, some potential risks must be behind these design guidelines. Some pioneering research work on this topic has been done since 1995, which has paved the way to formulation of the framework of probability-based design methodology. This paper presents a brief critical review about this topic, starting from probabilistic prediction for strength of FRP materials, to resistance factors, and to reliability analysis of FRP reinforced concrete members. Some existing problems and further research needs have also been addressed.