Ductility-Based Design Approach for Reinforcing RC Box Girders with Prestressed Carbon Fiber Plates

Introduction/Objectives: This study investigates the stress–strain behavior of RC box girders strengthened with prestressed CFRP plates. The objective is to develop a ductility-based design method that ensures structural performance is optimized while maintaining ductility. The study also explores potential patent opportunities for this innovative approach. Methods: The research proposes a theoretical design approach that uses a target ductility coefficient to determine the required CFRP reinforcement and the appropriate initial prestressing stress. The design is based on analyzing the constitutive relationship between stress and strain, considering different failure modes to achieve the desired ductility level. Results: The proposed method’s predictions were validated against experimental data, showing strong correlation and confirming the design’s accuracy. The comparison suggests that the method can be used effectively for RC box girder reinforcement and may hold potential for patent protection in structural reinforcement technologies. Discussion: Prestressed CFRP plates enhance the flexural performance of RC structures by preventing crack development and optimizing the material properties of CFRP. This advancement could be patented, offering a novel approach for structural reinforcement in engineering applications. Conclusion: The ductility-based design method provides a reliable and practical tool for determining CFRP reinforcement parameters in RC box girders. It ensures improved structural performance, operational feasibility, and presents a viable solution for future engineering applications and potential patent opportunities.