Investigation of Flexural Behavior of Concrete Bridge Decks and Beams Reinforced with Non-metallic Fiber Polymer FRP Bars

Document Type : Research Paper


1 Associate Professor, Faculty of Civil Engineering, Semnan University, Semnan, I. R. Iran.

2 MSc. of Structure, Faculty of Civil Engineering, Semnan University, Semnan, I. R. Iran.


Steel bars are widely used for reinforcing of structural concrete members. Although the steel bars have suitable application, but its deterioration and corrosion in aggressive environmental conditions such as reinforced decks or beams in bridges was displayed as a disaster. Replacing steel bars with Fiber Reinforced Polymer (FRP) bars is a good way to solve this problem, because FRP materials have high durability in acidic and aggressive environments. The influence of different parameters such as modulus of elasticity, section, and percentage of FRP tensile reinforcement on capacity, displacement and ultimate moment and the overall flexural behavior of RC decks and beams of bridges were numerically investigated in this paper.In order to evaluate the effectiveness of considered parameters with FRP, the behavior of 18 beams, reinforced with FRP bars, was simulated via finite element method. Results indicated that the ultimate capacity of beams reinforced with FRP bars was increased up to 16.45% due to increasing amount of longitudinal tensile bar percentage up to 73.62%. Also, after increasing the modulus of elasticity of FRP bars up to 35.3%, the ultimate capacity of beams was increased up to 9.75%. Therefore, application of FRP bars in bridges members can prevent probable deterioration and also increase load capacity.


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