Doctoral Dissertations

Keywords and Phrases

Bridge columns; Composite materials; Computational modeling


“This study investigates experimentally and numerically the seismic behavior of large-scale hollow-core fiber-reinforced polymer-concrete-steel (HC-FCS) innovative bridge columns as a sustainable approach to endure and rapidly recover from natural disasters such as earthquakes. The HC-FCS column consisted of a concrete shell sandwiched between an outer fiber-reinforced polymer (GFRP) tube and an inner steel tube to provided continuous confinement for the concrete shell along with the height of the column. The columns have a slender inner steel tube with diameter-to-thickness (Ds/ts) ratios ranged between 85 to 254. Each steel tube was embedded into the footing, while the GFRP tube was not embedded into the footing. The HC-FCS columns having a high Ds/ts ratio of 147 and 254 with short embedded length (1.25 Ds) do not dissipate high levels of energy and display nonlinear elastic performance due to severe steel tube buckling and slippage. However, the column with a Ds/ts ratio of 85 combined with substantial embedment length (1.6 Ds) results in a nonlinear inelastic behavior, high-energy dissipation, and ductile behavior. A retrofitting technique for a high Ds/ts ratio HC-FCS column precluding buckling of the inner steel tube was proposed, examined, and approved to be effective. New bond-slip expressions were proposed based on the analytical solution to capture the bond-slip effect between steel and concrete accurately. New design guidelines were proposed for HC-FCS columns in flexural and shear, as well as the column-to-footing connection. The innovative column approved to be easy to construct and repaired with high strength, drift, and resilience connection compared to the conventional bridge columns”--Abstract, page iv.


ElGawady, Mohamed

Committee Member(s)

Myers, John J.
Schonberg, William P.
Birman, V. (Victor)
Chandrashekhara, K.


Civil, Architectural and Environmental Engineering

Degree Name

Ph. D. in Civil Engineering


Mid-America Transportation Center (MATC), Missouri Department of Transportation (MoDOT), and Missouri Department of Natural Resources (MoDNR) funded the work in this research project.


Missouri University of Science and Technology

Publication Date

Spring 2020

Journal article titles appearing in thesis/dissertation

  • Seismic Behavior of Hollow-Core Composite Bridge Columns having Slender Inner Steel Tubes
  • Column-Footing Connection Evaluation of Hollow-Core Composite Bridge Columns
  • Determine the Shear Bond Strength between Steel H-Piles and Polymer Concrete Jackets
  • Interfacial Shear Transfer between Steel Hpiles Encased in Concrete Confined using CFRP
  • Seismic Shear Strength of Hollow-Core Composite Bridge Columns
  • Inelastic Response and Flexural Rigidity Evaluation
  • Evaluation and Design of Footing Connection for Innovative FRP-Concrete-Steel Composite Column
  • Bending and Buckling Behavior of Hollow-Core FRP-Concrete-Steel Columns


xxiii, 326 pages

Note about bibliography

Includes bibliographic references.


© 2020 Mohanad Mohsin Abdulazeez, All rights reserved.

Document Type

Dissertation - Open Access

File Type




Thesis Number

T 11864

Electronic OCLC #