Abstract
AbstractThe strength and behavior of precast segmental tunnel linings reinforced internally with fiber-reinforced-polymer (FRP) bars is one area in which limited experimental research results are available in practice. This paper reports on an investigation of the behavior of precast concrete tunnel segments reinforced with glass FRP (GFRP) bars under cyclic flexural loading. The study comprised testing of two full-scale precast concrete tunnel segments up to failure. The length and width of the segments are 3100 mm and 1500 mm, respectively, while the thickness is 250 mm. Segments are skewed at their ends rather than straight edges. Steel and GFRP bars were used in the experimental program. Test results show that the nominal flexural strength of the specimen reinforced with GFRP bars was higher than that of the steel counterpart specimen when the reinforcement ratios were similar. The experimental results were presented in terms of the general behavior of the tested specimens, flexural capacity, and mode of failure. The results of the current study show the feasibility and efficiency of using GFRP bars instead of steel bars for precast segmental tunnel linings.
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