Doctoral Dissertations


"Externally bonded fiber reinforced cementitious matrix (FRCM) composites have been investigated recently as an alternative to fiber reinforced polymer (FRP) composites to overcome certain shortcomings such as the inability to install on wet surfaces or in low temperatures, low fire resistance, low glass transition temperature, low reversibility, and lack of vapor permeability. This study includes an inclusive investigation of the torsional behavior of RC beams strengthened with externally bonded polyparaphenylene benzo-bisoxazole (PBO)-FRCM composite material. A comprehensive review and discussion of the previous experimental, analytical, and numerically-simulated torsional behavior of RC beams strengthened with FRP composite was introduced to gain a better understanding of their behavior. Then, an experimental campaign was conducted that included 11 solid rectangular RC beams, one without strengthening and 10 that were externally strengthened with PBO-FRCM composite. The effect of different parameters such as number of wrapped sides, the continuity of composite layer, number of composite layers, and fiber orientation on the torsional behavior in terms of strength, rotational ductility, and failure mode was investigated. Finite element and analytical models of the PBO-FRCM-strengthened beams were developed and verified with the experimental results. The contribution of the composite to the torsional strength was estimated based on the measured strain using design provisions for FRP-strengthened beams to examine the applicability of these provisions to the FRCM composite system. Furthermore, a comparison with other composite systems was conducted to compare the efficiency of the PBO-FRCM composite system on increasing the torsional strength of RC beams"--Abstract, page iv.


Sneed, Lesley

Committee Member(s)

Myers, John
ElGawady, Mohamed
Chandrashekhara, K.
Birman, V. (Victor)


Civil, Architectural and Environmental Engineering

Degree Name

Ph. D. in Civil Engineering


Higher Committee for Education Development in Iraq (HCED)


Missouri University of Science and Technology

Publication Date

Spring 2018

Journal article titles appearing in thesis/dissertation

  • Torsional strengthening of reinforced concrete beams with externally bonded composites: A state of the art review
  • Torsional behavior of RC beams strengthened with PBO-FRCM composite -- An experimental study
  • A study of the effect of fiber orientation on the torsional behavior of RC beams strengthened with PBO-FRCM composite
  • Finite element study on the behavior of RC beams strengthened with PBO-FRCM composite under torsion
  • Analytical study on the torsional behavior of reinforced concrete beams strengthened with FRCM composite


xviii, 215 pages

Note about bibliography

Includes bibliographic references.


© 2018 Meyyada Yahya Mohammed Alabdulhady, All rights reserved.

Document Type

Dissertation - Open Access

File Type




Thesis Number

T 11252

Electronic OCLC #