Low strength concrete members externally confined with FRP sheets
| Autor: | Alper Ilki, Nahit Kumbasar, Volkan Koc |
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| Předmět: |
Carbon fiber reinforced polymer
Materials science business.industry Mechanical Engineering Stress–strain curve Building and Construction Structural engineering Fibre-reinforced plastic Compression (physics) Compressive strength Mechanics of Materials Ultimate tensile strength Deformation (engineering) Composite material business Ductility Civil and Structural Engineering |
| Zdroj: | Scopus-Elsevier |
| Popis: | In this paper axial loading tests on low strength concrete members, which were confined with various thickness of carbon fiber reinforced polymer (CFRP) composite sheets are described. Totally 46 specimens with circular, square and rectangular cross-sections with unconfined concrete compressive strengths between 6 and 10 MPa were included in the test program. During the tests, a photogrammetrical deformation measurement technique was also used, as well as conventional measurement techniques. The contribution of external confinement with CFRP composite sheets to the compressive behavior of the specimens with low strength concrete is evaluated quantitatively, in terms of strength, longitudinal and lateral deformability and energy dissipation. The effects of width/depth ratios and the corner radius of the specimens with rectangular cross-section on the axial behavior were also examined. It was seen that the effectiveness of the external confinement with CFRP composite sheets is much more pronounced, when the unconfined concrete compressive strength is relatively lower. It was also found that the available analytical expressions proposed for normal or high strength concrete confined by CFRP sheets could not predict the strength and deformability of CFRP confined low strength concrete accurately. New expressions are proposed for the compressive strength and the ultimate axial strain of CFRP confined low strength concrete. |
| Databáze: | OpenAIRE |
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