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Possible Interaction between the Existing Transverse Steel and the Rehabilitating FRP Shear Reinforcement in RC Beams Strengthened with EB, NSM, ETS and L-Shaped FRP Methods

Lookup NU author(s): Dr Amir MofidiORCiD



This is the authors' accepted manuscript of a conference proceedings (inc. abstract) that has been published in its final definitive form by Queens university Belfast, 2019.

For re-use rights please refer to the publisher's terms and conditions.


The main objective of this study is to gain insight into a possible interaction between internal transverse steel and strengthening Fibre-Reinforced Polymer (FRP) reinforcement used to strengthen RC beams in shear with different FRP rehabilitation methods. To better investigate the interaction between internal steel and FRP shear reinforcement, experimental results of fifteen specimens strengthened with Externally-Bonded (EB), Near-Surface Mounted (NSM), and Embedded Through-Section (ETS) methods that were tested by the authors are studied. In addition, the results of seven shear-strengthened specimens with anchored EB FRP fabrics and L-shaped FRP plates are used to evaluate a possible diminishing effect of FRP reinforcement on the internal transverse steel shear contribution. The results of this study show that although the presence of transverse steel has an adverse effect on the effectiveness of shear strengthening EB FRP, the presence of EB FRP does not inhibit yielding of the transverse shear reinforcement at ultimate. Moreover, unlike EB FRP, the diminishing effect of existing steel shear reinforcement on strengthening FRP does not seem to exist for specimens strengthened in shear with NSM and ETS FRP methods. Meanwhile, as for specimens strengthened with EB FRP method, the steel shear reinforcement also yields before final failure for specimens strengthened with NSM, ETS, anchored EB and L-shaped FRP.

Publication metadata

Author(s): Mofidi A, Chaallal O

Editor(s): Su Taylor

Publication type: Conference Proceedings (inc. Abstract)

Publication status: Published

Conference Name: The 14th International Symposium on Fiber-Reinforced Polymer Reinforcement of Concrete Structures (FRPRCS)

Year of Conference: 2019

Online publication date: 04/06/2019

Acceptance date: 29/03/2019

Date deposited: 10/12/2019

Publisher: Queens university Belfast