Abstract
Research shows that most shear design models for concrete beams reinforced with FRP reinforcement provide conservative results that leads to excessive amounts of reinforcement and increased overall cost of such construction. This paper presents comparative analysis of current shear design models for concrete beams reinforced with longitudinal FRP reinforcement and FRP stirrups. New analytical shear design model, developed by Valivonis et al., has been included in the analysis. A database with 88 specimens reinforced with FRP reinforcement was compiled in order to verify the accuracy of the proposed model by Valivonis et al. It is shown that proposed shear design model yields quite accurate and consistent results as an average of Vexp / Vpred values is 0.98 and coefficient of variation is 26.0% for this model.
Highlights
Working life of steel reinforced concrete structures is shortened by steel reinforcement corrosion
Fiber-reinforced polymer (FRP) reinforcement is more durable than steel reinforcement so it can be considered as more advantageous alternative to steel reinforcement when using it to reinforce concrete structures exposed to aggressive environment
It was determined that repair of all steel reinforced concrete structures in Canada would cost about 74 billion dollars (Natural Sciences and Engineering Research Council of Canada, 2010)
Summary
Working life of steel reinforced concrete structures is shortened by steel reinforcement corrosion. Corrosion is dangerous for structures in aggressive marine environment or unprotected from the effect of deicing salts. Working life of such structures is highly dependent on the durability of reinforcement. Reinforcement, located closest to the surface of the element (e.g. shear reinforcement in beams), is the most vulnerable to aggressive environmental effects. For this reason, employment of FRP shear reinforcement in such cases is even more meaningful. It was determined that repair of all steel reinforced concrete structures in Canada would cost about 74 billion dollars (Natural Sciences and Engineering Research Council of Canada, 2010). Research, development and practical use of concrete structures reinforced with FRP reinforcement recently has gained more and more interest in the field of civil engineering
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