Design method for bridge deck link slabs prepared using BFRP bar‐reinforced ecological high‐ductility cementitious composites by theoretical calculation and numerical simulation

Abstract

AbstractBridge deck link slabs prepared using Basalt Fiber Reinforced Polymer (BFRP) bar‐reinforced ecological high‐ductility cementitious composites (Eco‐HDCC) were applied as substitutes for steel expansion joints in Malin Bridge. Theoretical calculations and numerical simulations were combined to develop a design method. The total length and debond length of the link slabs were assumed based on the bridge information, and the reinforcement ratio of the BFRP bar was calculated using the maximum crack width limit. Then, the flexural capacity of the link slabs was evaluated. A preliminary reinforcement program using eight reinforcement ratios and different bar diameters was developed. In addition, the maximum stresses, strains, and deflections of the link slabs were validated through Abaqus finite element analysis. The simulation results of the reinforcement programs with minor reinforcement ratios are similar. The maximum stresses, strains, and deflections of the link slab materials are significantly lower than the design ultimate capacities of the materials, implying that the eight reinforcement programs are feasible. Because the thickness of the link slabs is within the range of 80–120 mm, a small‐diameter bar is preferable. Furthermore, BFRP bars with diameters of 10–14 mm are suitable along the driving direction, whereas BFRP bars with diameters of 10 mm are recommended along the direction perpendicular to the driving direction. A detailed design method flowchart for bridge deck link slabs was constructed to serve as a guideline for engineers.