Structural Behavior of Disturbed Regions in RC Beams Strengthened with NSM Steel Bars and Externally Bonded GFRP

Raheem M. M., Rasheed H. A.

10th International Conference on Fibre-Reinforced Polymer (FRP) Composites in Civil Engineering (CICE), İstanbul, Turkey, 8 - 10 December 2021, vol.198, pp.1344-1352 identifier identifier

  • Publication Type: Conference Paper / Full Text
  • Volume: 198
  • Doi Number: 10.1007/978-3-030-88166-5_116
  • City: İstanbul
  • Country: Turkey
  • Page Numbers: pp.1344-1352
  • Keywords: Truss analogy, GFRP sheets, Anchorage system, GFRP splay anchors
  • Istanbul Technical University Affiliated: No


Anchorage of externally bonded FRP sheets is gaining a lot of attention recently to improve the performance of strengthened concrete members. In this study, the use of GFRP U-wraps and flexural GFRP sheets is examined with and without the use of GFRP anchors. Eccentrically loaded high strength concrete beams introduce a disturbed shear region that is evaluated experimentally and analytically. The beam specimens are strengthened with different strengthening schemes, and the behavior of these beams are compared to each other experimentally. Moreover, a new analysis method is developed to predict the capacity of RC beams with and without strengthening. The method utilizes the truss analogy approach that is extended from the strut-and-tie model for unstrengthened beams. The new method is able to predict the capacity of the beam specimens at the key points (yielding and ultimate). Comparison of the analytical and experimental results are made. Very good agreement is found.