guo, qi
(2017)
Long-Term Stability of Pultruded Glass Fiber-Reinforced-Polymer Columns.
Master's Thesis, University of Pittsburgh.
(Unpublished)
Abstract
Despite the increasing understanding of long-term behaviors of pGFRP (pultruded Glass Fiber Reinforced Polymer) material, investigation of long-term stability of pGFRP columns is still lacking. In this thesis, the time-dependent axial buckling behavior of pGFRP is investigated – this is termed creep buckling. An equation describing the relationship between mid-height lateral deflection of a section under axial load and time was proposed; this was a modification of traditional viscoelastic models using an empirical model, the Findley power law. Prediction of critical time of creep buckling was determined with the expression and compared to experimental results. For reference, a viscoelastic model utilizing string and dashpot – the Kelvin standard solid model – was also used to obtain theoretical predictions. Model parameters and long-term moduli were determined using flexural creep tests. With comparison between theoretical and experimental results, the equation proposed in this work was observed to offer more conservative and reliable prediction of critical time to creep buckling compared to the analytical equation derived from viscoelastic theory.
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| Item Type: |
University of Pittsburgh ETD
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| Status: |
Unpublished |
| Creators/Authors: |
|
| ETD Committee: |
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| Date: |
13 June 2017 |
| Date Type: |
Publication |
| Defense Date: |
4 April 2017 |
| Approval Date: |
13 June 2017 |
| Submission Date: |
6 April 2017 |
| Access Restriction: |
No restriction; Release the ETD for access worldwide immediately. |
| Number of Pages: |
89 |
| Institution: |
University of Pittsburgh |
| Schools and Programs: |
Swanson School of Engineering > Civil and Environmental Engineering |
| Degree: |
MS - Master of Science |
| Thesis Type: |
Master's Thesis |
| Refereed: |
Yes |
| Uncontrolled Keywords: |
long-term stability, creep buckling, creep, GFRP, Findley power law |
| Date Deposited: |
13 Jun 2017 14:11 |
| Last Modified: |
13 Jun 2017 14:11 |
| URI: |
http://d-scholarship.pitt.edu/id/eprint/31305 |
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