New Anchorage Technique for GFRP Flexural Strengthening of Concrete Beams Using Bolts-End Anchoring System
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Date
2023
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Abstract
The concept of external glass FRP composite confinement is a current process for strengthening concrete beams
subjected to static loads. End anchorage glass FRP composites of 80 mm width and 90–130 mm length with different
thicknesses (2.4 and 4.8 mm) have been fixed at the bottom of beams with bolts of various diameters (6 and 10 mm).
For this purpose, the behavior of beams strengthened with bolt-end anchoring glass fiber polymer composites
(BEGFPC) has been analyzed. It is concluded that the load capacity of the BEGFPC beams is improved by increasing
the end-anchorage glass FRP composite thickness (about 98–188%). In addition, the BEGFPC system with bolts of
6 mm diameter has significantly improved the flexibility of beams. In contrast, the 10 mm bolts in diameter give a
high ultimate load, whatever their quantity. Therefore, combining bolts with diameters of 6 and 10 mm would be the
best solution for increasing the ultimate load and ductility of the retrofitted beams. Depending on the number and
bolts’ arrangement, there is also an enhancement in the crack patterns by changing from intermediate flexural failure
to shear failure in beams