Abstract
The article presents experimental tests of a new type of composite bar that has been used as shear reinforcement for concrete beams. In the case of shearing concrete beams reinforced with steel stirrups, according to the theory of plasticity, the plastic deformation of stirrups and stress redistribution in stirrups cut by a diagonal crack are permitted. Tensile composite reinforcement is characterized by linear-elastic behavior throughout the entire strength range. The most popular type of shear reinforcement is closed frame stirrups, and this type of Fiber Reinforced Polymer (FRP) shear reinforcement was the subject of research by other authors. In the case of FRP stirrups, rupture occurs rapidly without the shear reinforcement being able to redistribute stress. An attempt was made to introduce a quasi-plastic character into the mechanisms transferring shear by appropriately shaping the shear reinforcement. Experimental material tests covered the determination of the strength and deformability of straight Glass Fiber Reinforced Polymer (GFRP) bars and GFRP headed bars. Experimental studies of shear reinforced beams with GFRP stirrups and GFRP headed bars were carried out. This allowed a direct comparison of the shear behavior of beams reinforced with standard GFRP stirrups and a new type of shear reinforcement: GFRP headed bars. Experimental studies demonstrated that GFRP headed bars could be used as shear reinforcement in concrete beams. Unlike GFRP stirrups, these bars allow stress redistribution in bars cut by a diagonal crack.
Highlights
Corrosion of reinforcing steel is the main factor causing material degradation in reinforced concrete structures, which, if exposed to adverse environmental conditions, cease to meet the requirements of durability and reliability in a facility in a relatively short time [1,2,3,4]
The failure mode of straight bars was of an explosive nature, and all bars were characterized by linear-elastic behavior over the entire strength range
The article presented experimental tests of a new type of composite bar that was used as shear reinforcement for concrete beams
Summary
Corrosion of reinforcing steel is the main factor causing material degradation in reinforced concrete structures, which, if exposed to adverse environmental conditions, cease to meet the requirements of durability and reliability in a facility in a relatively short time [1,2,3,4]. The durability of reinforced concrete structures is important for industrial facilities [5,6,7]. The use of non-metallic reinforcement as the main reinforcement of concrete elements is one way to exclude corrosion and extend the service life of the structure. Reinforced concrete elements embedded in structures exposed to adverse weather and operating conditions require time-consuming and cost-intensive renovation. Among types of bar-shaped polymer reinforcement, we distinguish bars made of glass fiber (Glass Fiber Reinforced Polymer (GFRP)), carbon fiber
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