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

摘要

Bridge 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. Theoreticalcalculations and numerical simulations were combined to develop a designmethod. The total length and debond length of the link slabs were assumedbased on the bridge information, and the reinforcement ratio of the BFRP barwas calculated using the maximum crack width limit. Then, the flexural capacityof the link slabs was evaluated. A preliminary reinforcement program usingeight reinforcement ratios and different bar diameters was developed. In addition,the maximum stresses, strains, and deflections of the link slabs were validatedthrough Abaqus finite element analysis. The simulation results of thereinforcement programs with minor reinforcement ratios are similar. The maximumstresses, strains, and deflections of the link slab materials are significantlylower than the design ultimate capacities of the materials, implying thatthe eight reinforcement programs are feasible. Because the thickness of thelink 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 thedriving direction, whereas BFRP bars with diameters of 10 mm are recommendedalong the direction perpendicular to the driving direction. A detaileddesign method flowchart for bridge deck link slabs was constructed to serve asa guideline for engineers.