Nowadays, most of the bridge structures that use steel bars encounter corrosion problems with steel bars or tendons. This problem results in the early failure. The fiber reinforced polymer as reinforcement enhances the durability in corrosive environments and refuse to reach the failure early. The purpose of this research is to investigate the maximum length of reinforced concrete girder in FRP bars as reinforcement by use of displacement, stress and strain by computer simulation. To avoid the failure, allowable displacement, stress bar and solid strain value were checked. In other words, steel bar in bridge concrete beam is replaced by CFRP and GFRP bars and the deflection is checked to find the maximum length. Seven various spans are tested by three specimens of CFRP, GFRP, and steel bars are utilized in each of the spans. This study can aid bridge designers and structure engineers to make decisions of selecting appropriate polymer materials for preventing early failure in bridges.
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