중공형 GFRP 보강근의 인장성능 실험연구
Experimental Study on GFRP Reinforcing Bars with Hollow Section
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초록
Fiber-reinforced polymer (FRP) has been generally accepted by civil engineers as an alternative for steel reinforcing bars (rebar)due to its advantageous specific tensile strength and non-corrosiveness. Even though some glass fiber reinforced polymer (GFRP)rebars are available on a market, GFRP is still somewhat uncompetitive over steel rebar due to their high cost and relatively lowelastic modulus, and brittle failure characteristic. If the price of component materials of GFRP rebar is not reduced, it would beanother solution to increase the performance of each material to the highest degree. The tensile strength generally decreases withincreasing diameter of FRP rebar. One of the reasons is that only fibers except for fibers in center resist the external force dueto the lack of force transfer and the deformation of only outer fibers by gripping system. Eliminating fibers in the center, whichdo not play an aimed role fully, are helpful to reduce the price and finally FRP rebar would be optimized over the price. In thisstudy, the effect of the hollow section in a cross-section of a GFRP rebar was investigated. A GFRP rebar with 19 mm diameterwas selected and an analysis was performed for the tensile test results. Parameter was the ratio of hollow section over solidcross-section. Four kinds of hollow sections were planned. A total of 27 specimens, six specimens for each hollow section andthree specimens with a solid cross-section were manufactured and tested. The change by the ratio of hollow section over solidcross-section was analyzed and an optimized cross-section design was proposed.
Abstract
Fiber-reinforced polymer (FRP) has been generally accepted by civil engineers as an alternative for steel reinforcing bars (rebar)due to its advantageous specific tensile strength and non-corrosiveness. Even though some glass fiber reinforced polymer (GFRP)rebars are available on a market, GFRP is still somewhat uncompetitive over steel rebar due to their high cost and relatively lowelastic modulus, and brittle failure characteristic. If the price of component materials of GFRP rebar is not reduced, it would beanother solution to increase the performance of each material to the highest degree. The tensile strength generally decreases withincreasing diameter of FRP rebar. One of the reasons is that only fibers except for fibers in center resist the external force dueto the lack of force transfer and the deformation of only outer fibers by gripping system. Eliminating fibers in the center, whichdo not play an aimed role fully, are helpful to reduce the price and finally FRP rebar would be optimized over the price. In thisstudy, the effect of the hollow section in a cross-section of a GFRP rebar was investigated. A GFRP rebar with 19 mm diameterwas selected and an analysis was performed for the tensile test results. Parameter was the ratio of hollow section over solidcross-section. Four kinds of hollow sections were planned. A total of 27 specimens, six specimens for each hollow section andthree specimens with a solid cross-section were manufactured and tested. The change by the ratio of hollow section over solidcross-section was analyzed and an optimized cross-section design was proposed.
참고문헌 (13)
- Ahmadi, M. S., "An experimental study on mechanical properties of GFRP braid-pultruded composite rods", eXPRESS Polymer Letters, 3(9), pp.560~568 (2009)
- American Concrete Institute, "State-of-the-Art Report on Fiber Reinforced Plastic (FRP) Reinforcement for Concrete Structures", ACI 440R-96, Committee 440, 3~ (1996)
- Bank, L. C., "Composites for Construction: Structural Design with FRP materials" (2006), John Wiley & Sons, Inc
- Daniel, I. M., "Engineering Mechanics of Composite Materials", pp.72~85 (1994), Oxford University press
- "Hughes Brothers Inc" (2014)[URL]
- ISIS Canada, "Design Manual 3: Reinforcing concrete structures with fiber reinforced polymers" (2001), The Canadian Network of Centers of Excellence on Intelligent Sensing for Innovative Structures
- Johnson, D. T. C., "Investigation of glass fibre reinforced polymer reinforcing bars as internal reinforcement for concrete structures", MSc, Department of Civil Engineering,, pp.2009
- Ko, F. K., "Fiber architecture based design of ductile composite rebars for concrete structures", Proceedings of the 11th International Conference of Composite Materials, 4 (1997)
- Design and construction technology for concrete structures using advanced composite materials, "Korea Institute of Construction Technology", Korea Research Council of Public Science and Technology, ~ (2006)
- Lee, D. G., "Composite materials", pp.166~ (2007), Hongrung publishing company
- THE BEHAVIOR OF FIBER-REINFORCED POLYMER REINFORCEMENT IN LOW TEMPERATURE ENVIRONMENTAL CLIMATES, "Rene´e, C.", Department of Civil, Environmental & Architectural Engineering, University of Colorado, ~, pp.Report No. CDOT-DTD-R-2003-4 (2003)
- Wang, Z., "Bond strength of various types of fiber reinforced plastic rods", Fourth International Symposium on Fiber Reinforced Polymer Reinforcement for Reinforced Concrete Structures, pp.1127~ (1999)
- Zenon, A., "Bond behavior of fiber reinforced polymer bars under direct pullout conditions", Journal of composites for construction, 8, pp.173~181 (2004)