New fibre-reinforced polymer box beam: investigation of static behaviour

Springolo, Mario (2005) New fibre-reinforced polymer box beam: investigation of static behaviour. [Thesis (PhD/Research)]

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This thesis discusses the development of a new type of fibre-reinforced polymer (FRP) beam for use in civil engineering systems. After a detailed evaluation of the advantages and disadvantages of current FRP beam technology, a different approach is proposed which combines traditional laminates with a novel casting technique. To pre-dimension the beam, the classical beam theory is adapted to allow for FRP materials. The resulting formulae were used to determine critical parameters, such as laminate thickness and location in the cross-section, and core dimensions, and to identify failure modes. Based on the results of this analytical study, a detailed testing program was developed. In addition to classical tests, such as bending, shear, and lateral torsion, the performance of the beam was also examined under particular loading regimes specifically designed to induce local failure modes, such as buckling of the web and bearing failure of the section under concentrated loads. The experimental results revealed very good agreement with the analytical predictions. These results were corroborated by a detailed non-linear finite-element analysis, including core cracking and laminate damage. This analysis, in particular, highlighted the synergy between bending and shear behaviour of the beam. This study has revealed that this new type of FRP beam behaves in a predictable manner. Furthermore, the experimental results verified that the cross-section, which combines traditional laminates with cast polymer concrete, did not suffer from many of the disadvantages identified in current FRP beams. The cracking of the polymer concrete under shear, however, does cause the beam to fail prior to the laminates reaching their ultimate shear stress.

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Item Type: Thesis (PhD/Research)
Item Status: Live Archive
Additional Information: Doctor of Philosophy (PhD) thesis. Transferred from ADT 30/11/2006.
Faculty / Department / School: Historic - Faculty of Engineering and Surveying - No Department
Supervisors: Van Erp, Gerard; Khennane, Amar
Date Deposited: 11 Oct 2007 00:46
Last Modified: 02 Jul 2013 22:38
Uncontrolled Keywords: fibre-reinforced polymer (FRP), beam, concrete, buckling
Fields of Research : 09 Engineering > 0905 Civil Engineering > 090506 Structural Engineering

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