Behaviour of link slab with FRP rebars in jointless bridge decks

Abstract

This research investigates the design, structural behaviour and performance of bridge link slabs reinforced with conventional steel and Glass Fibre Reinforced Polymer (GFRP) bars that play a vital role in the development of modern jointless bridge systems. Link slabs are increasingly used to provide continuity between adjacent spans or between the deck and abutments, effectively eliminating traditional expansion joints. This jointless approach enhances the ride quality, reduces long-term maintenance requirements, and significantly improves the durability and structural integrity of bridge systems. The study specifically focuses on the application of GFRP reinforcement in link slabs, aiming to overcome the limitations associated with steel reinforcement, particularly corrosion-induced deterioration. GFRP bars offer notable advantages, including corrosion resistance, a high tensile strength to weight ratio, and non-magnetic properties. However, their relatively low modulus of elasticity introduces challenges in terms of crack control, deformability, and anchorage performance. The research methodology comprises experimental testing of link slabs reinforced with both steel and GFRP bars to analyse their flexural behaviour under the moving load from heavy vehicular traffic which is considered as HB load in British codes. Numerical modelling using Finite Element Analysis (FEA) is employed to validate the experimental results and explore additional parameters. Furthermore, a detailed cost analysis is conducted to evaluate the practical feasibility of implementing GFRP reinforced link slabs in the construction industry. Ultimately, this study aims to demonstrate the viability of GFRP as a durable, low maintenance alternative to traditional steel reinforcement in link slabs, thereby contributing to the advancement of resilient, long-lasting and sustainable bridge infrastructure