Masters Theses

Keywords and Phrases

Buckling; Concrete; Element; FRP; Steel; Thin-Walled


“The hollow core Fiber-Reinforced-Polymer (FRP) concrete circular-steel (HC-FCS) column consists of an outer circular fiber reinforced polymer (FRP) tube, an inner thin-walled circular steel tube concentrically aligned, and a concrete shell between them. Research has been performed on the performance of the member as a whole, but to date, there has been no investigation into the behavior of the steel tube confined in the column. 17 small-scale columns were tested under axisymmetric axial compressions applied directly to the steel tube under displacement control. The conducted parametric study examined the effects of diameter-to-thickness (D/t) ratio, concrete unconfined compressive strength, FRP thickness, and concrete shell thickness. Ductility is improved in all cases with the concrete adding a positive second curve. Increasing the D/t ratio led to the column not reaching yield if D/t exceeded 118. Concrete strength and thickness had little effect on capacity. Finally, Increasing FRP thickness had a powerful influence on stiffness. The experimental tests were used to the development and validate a numerical model of a steel tube with an original end condition under axial compressive loading which will be used in future modeling of the HC-FCS column. A three-dimensional numerical model was developed using the software LS_DYNA to model local buckling of steel. Validation of the behavior, stiffness, and failure of the model was based upon tests performed on four thicknesses of steel with diameter-to-thickness ratios (D/t) ranging from 40 to 280”--Abstract, page iv.


ElGawady, Mohamed

Committee Member(s)

Yan, Guirong Grace
Chandrashekhara, K.


Civil, Architectural and Environmental Engineering

Degree Name

M.S. in Civil Engineering


Missouri University of Science and Technology

Publication Date

Spring 2018

Journal article titles appearing in thesis/dissertation

  • Local Buckling of Axially Loaded Steel Tubes Confined by Concrete and FRP
  • Numerical and Experimental Perturbation-Based Analysis of Thin-Walled Steel Tubes Buckling Under Compression


xii, 86 pages

Note about bibliography

Includes bibliographic references.


© 2018 Nicholas Brian Colbert, All rights reserved.

Document Type

Thesis - Open Access

File Type




Thesis Number

T 12008

Electronic OCLC #