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PROCEEDINGS OF THE ELEVENTH INTERNATIONAL CONFERENCE ON CIVIL, STRUCTURAL AND ENVIRONMENTAL ENGINEERING COMPUTING
Edited by: B.H.V. Topping
Continuous Unidirectional Carbon Fibre-Reinforced Concrete Beams
M. Salehi1 and M.N.S. Hadi2
1Mechanical Engineering Department, Amirkabir University of Technology, Tehran, Iran
M. Salehi, M.N.S. Hadi, "Continuous Unidirectional Carbon Fibre-Reinforced Concrete Beams", in B.H.V. Topping, (Editor), "Proceedings of the Eleventh International Conference on Civil, Structural and Environmental Engineering Computing", Civil-Comp Press, Stirlingshire, UK, Paper 168, 2007. doi:10.4203/ccp.86.168
Keywords: carbon fibres, FRP, continuous fibre, RC beams, concrete, carbon reinforcement, unidirectional fibres.
Application of polymer composite materials was initiated in the aerospace industry and then it progressed into the automotive industry and other engineering fields. During the last two decades, they have found applications in structural engineering fields, in particular for strengthening concrete structures. Fibre-reinforced polymer structures have a great advantage over their steel and concrete counterparts mainly due to their high strength to weight ratios. At the present, the main applications of fibre-reinforced plastics-polymers (FRP) in civil engineering structures are for strengthening concrete beams, columns or slabs. However, the major advantages of using FRP come when the whole structure is constructed from FRP. The structure may be constructed of carbon fibre-reinforced polymers (CFRP), glass fibre-reinforced polymers (GFRP) or more advanced composites like graphite fibre-reinforced polymers may be used. Of course, this type of material may not be economical for civil engineering structures applications.
The first glass fibre-reinforced plastic pultruded box beam was tested in three-point bending by the first author at the Engineering Laboratories at Lancaster University, England in the summer of 1990. However, it appears that the initial studies of the application of FRP as construction materials are due to Cooper and Turvey . As reported in his series of papers beginning in 1995, he and his co-researchers conducted detailed experimental as well as finite element simulations of various aspects of structural members made from pultruded GFRP.
In the present work continuous unidirectional fibres are embedded in plain concrete beams. However, this method of reinforcing concrete structures can only be used for structure construction and not for rehabilitation purposes. This paper reports a set of experimental results for continuous unidirectional carbon fibre-reinforced concrete beams. The fibres are embedded at different layers in the tension side of the beam below the neutral axis. All together nine concrete beams were constructed and tested, three of which contained no reinforcement. The carbon fibre-reinforced concrete beam load-deflection results are presented graphically for three beams with one-layer, one beam with two-layers and two beams with four-layers of continuous unidirectional fibres. The maximum deflections of the reinforced beams are compared with those of plain concrete beams. The load-carrying capacity of the beams is approximately tripled and ductility has increased enormously.
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