Abstract

Fiber reinforced plastic (FRP) has in recent years emerged as an alternative reinforcement for structural concrete. The properties that make FRP appealing to the construction industry include its resistance to electro-chemical corrosion, high strength to- weight ratio, and electrical insulation. An efficient use of FRP is in the form of concrete-filled tubes, where the tube not only protects the concrete against environmental factors, but also provides confinement and external reinforcement. Since use of fiber composites for confining concrete is relatively new, analytical work in this area is limited to the models that were originally developed for transverse steel reinforcement. However, it has been shown that such models overestimate the strength of FRP-confined concrete, and result in unsafe design~ This study is focused on developing a nonlinear finite element model for the analysis ofFRP-confined concrete. Solid elements are used for the concrete core, along with a non-associative Drucker-Prager type plasticity, which takes into account the pressure sensitivity of the material. The parameters used to model the concrete are cohesion, angle of internal friction, and the dilatancy angle. The jacket is modeled by linear-elastic membrane shell elements. A parametric program was developed within the ANSYS® software to automatically generate the mesh for various geometric shapes and material properties. A sensitivity analysis was conducted to determine the optimum number of elements required in the mesh. The model was validated against previous experiments at UCF. The stress-strain curves compared favorably with the test data. The model was also used for square sections to compare their confinement effectiveness with that of circular sections. The analysis, much the same as the experiments, showed stress concentrations around the comers. The stress concentration and the confinement effectiveness both depend on the comer radius of the section. Finally, the model was used to examine the plastic deformations of concrete filled FRP tubes under cyclic loading, i.e., unloading and reloading in compression.

Graduation Date

1998

Semester

Fall

Advisor

Mirmiran, Amir

Degree

Master of Science (M.S.)

College

College of Engineering

Department

Civil and Environmental Engineering

Degree Program

Structures and Foundations

Format

PDF

Pages

111 p.

Language

English

Rights

Written permission granted by copyright holder to the University of Central Florida Libraries to digitize and distribute for nonprofit, educational purposes.

Length of Campus-only Access

None

Access Status

Masters Thesis (Open Access)

Identifier

DP0022794

Subjects

Dissertations, Academic -- Engineering; Engineering -- Dissertations, Academic

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