Abstract
Several R.C. (reinforced concrete) beams research have been surveyed in the shear area using fiber-reinforced polymer (FRP) composites and ended in collapse in the shear due to the separation of the FRP. The NSM method utilizing fiber fortified polymer (FRP) bars is currently an entrenched method for the reinforced concrete strengthening structures. The main proposal of this search is to look into experimentally for strengthening shear behavior with RC NSM carbon fiber reinforced polymer (CFRP) bars and exhibit the numerical outcomes for strengthened beams in shear with various FRP types; carbon fiber bar (CFRP), aramid fiber bar (AFRP), and glass fiber bar (GFRP) in shear. Three-dimensional beam models using finite element method are formed with software ANSYS-2013 to study the behavior of FRP in strengthening. Finally, a simply proposed equation is produced to estimate the shear strengthening capacity. The proposed equation affirms the exactness and viability of the experimental numerical result.
Highlights
In an effort at overcoming these drawbacks, a strengthening technique designated by near surface mounted (NSM) was projected, where fiber-reinforced polymer (FRP) rods are fixed into opened slice channel on the surface of concrete [7]
The strengthening of the beam using NSM carbon fiber reinforced polymer (CFRP) bars with angel 45° at the two sides of the beam give the best results
NSM FRP shear strengthening has a high potential to increase shear capacity of reinforced concrete beams ranging from 12%-35% compared to a control beam
Summary
Strengthening and healing of concrete structures have been among the most considerable challenges in structure engineering. Bonded reinforcing (EBR) procedure using FRP laminates has been used for enhanced the shear R.C. beams capacity [1,3-5]. Many studies on using of NSM FRP for strengthening of R.C. beams in shear as well as flexural have been published [10-15]. One control beam (BS0) and 12 specimens strengthened in shear with different types of fiber carbon (CFRP), aramid fiber (AFRP) and glass fiber (GFRP). The other models include six specimens strengthened horizontally with CFRP, AFRP and GFRP bars with diameter 10 mm and with different spacing 60 mm (two FRP bars each side) and 50 mm (three FRP bars each side), Table 4 shows the study model details.
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