Experimental and Numerical Investigation of Shear Behavior of RC Beams Strengthened by Ultra-High Performance Concrete

Ashraf Awadh Bahraq, Mohammed Ali Al-Osta*, Shamsad Ahmad, Mesfer Mohammad Al-Zahrani, Salah Othman Al-Dulaijan, Muhammad Kalimur Rahman

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

66 Scopus citations


This paper presents a study on the shear behavior of reinforced concrete (RC) beams strengthened by jacketing the surfaces of the beams using ultra-high performance fiber reinforced concrete (UHPC). The surfaces of the RC beams were prepared by sandblasting and UHPC was cast in situ over the surfaces of RC beams. The beams were strengthened using two different strengthening configurations; (i) two longitudinal sides strengthening (ii) three sides strengthening. The bond between normal concrete and UHPC was examined by conducting splitting tensile strength and slant shear strength tests on composite cylindrical specimens cast using normal concrete and UHPC. The control and strengthened beam specimens were tested using four-point loading arrangement maintaining different shear span-to-depth ratios. The results of tested beams showed the beneficial effects of strengthening the RC beams using UHPC, as evident from enhancement of the shear capacity and shifting of the failure mode from brittle to ductile with more stiff behavior. In addition, a non-linear finite element model (FEM) was developed to examine the sufficiency of the experimental results used to study the shear behavior of control and strengthened beams. The failure loads and the crack patterns determined experimentally matched well with those predicted using the proposed model with a reasonably good degree of accuracy.

Original languageEnglish
Article number6
JournalInternational Journal of Concrete Structures and Materials
Issue number1
StatePublished - 1 Dec 2019

Bibliographical note

Publisher Copyright:
© 2019, The Author(s).


  • RC beam
  • bond strength
  • finite element model
  • shear behavior
  • strengthening
  • ultra-high performance fiber reinforced concrete

ASJC Scopus subject areas

  • Civil and Structural Engineering
  • Ocean Engineering


Dive into the research topics of 'Experimental and Numerical Investigation of Shear Behavior of RC Beams Strengthened by Ultra-High Performance Concrete'. Together they form a unique fingerprint.

Cite this