Utilization of Glass Fiber Reinforced Polymer (GFRP) Bar in Bridge Deck Construction

Abstract: This study explores the utilization of Glass Fiber Reinforced Polymer (GFRP) bars in bridge deck construction, aiming to establish GFRP rebar as a viable and effective alternative to traditional materials such as black steel, galvanized steel, stainless steel, and epoxy-coated reinforced bridge decks. With the increasing demand for innovative, environmentally friendly, and durable construction materials, this study seeks to enhance awareness and confidence among bridge engineers and designers regarding GFRP technology. Notably, MST-BAR offers significant benefits for bridge applications, including high corrosion resistance in aggressive environmental conditions, reduced maintenance requirements, high stiffness to weight ratio, and lower lifecycle costs, making it a sustainable choice for infrastructure projects.
The study will cover several critical topics. First, it will provide a comparative analysis of GFRP and steel rebar, focusing on essential aspects such as failure modes, ductility, and deformability to establish a foundational understanding of the differences and similarities in design between GFRP bars and steel rebar. Following this, a detailed, step-by-step design process based on the AASHTO LRFD 2nd Edition for GFRP will be presented, aiming to assist engineers in confidently integrating GFRP into their designs.
Additionally, the study will highlight real-world examples of successfully designed and constructed GFRP bridge decks, demonstrating their performance and advantages. A comprehensive cost comparison between GFRP and epoxy-coated rebar will also be conducted, utilizing actual costs from completed projects and updated financial information to provide crucial insights for decision-makers.
The study will address various constructability challenges and advantages associated with GFRP, such as bent bars, hydro demolition techniques, and the use of mechanical couplers (UHPC). Furthermore, testimonials and videos from contractors experienced in GFRP installation will offer practical insights and real-world experiences regarding the material's application in bridge projects.
Lastly, the study will discuss the potential for expanding GFRP applications in bridges, including barrier railings, bent caps, and approach slabs, further emphasizing the versatility of this material. Ultimately, this study aims to educate the engineering community and foster increased acceptance and understanding of GFRP rebar in bridge design.