STRENGTH PREDICTION OF LAP SPLICE CONFINED WITH FIBER REINFORCED POLYMER (FRP)
Keywords:
Post-yield, laps splice strength, bond stress model, nonlinear model, fiber-reinforced polymerAbstract
This paper presents a tri-uniform bond stress model for simulating the bond stress distribution alongthe lap splice length at the critical post-yield force of a reinforcing bar. The bond distribution consistsof 3 parts, namely, the splitting part, the post-splitting part, and the yielding part. In each part, thebond stress is assumed to be constant. The model is applicable to simulate the bond strength of thelap splice strengthened by both transverse steel and fiber reinforced polymer (FRP). The lap splicestrength in either the elastic range or post-yield range can be predicted by applying the proposedtri-uniform model. The strength of the lap splice calculated by the proposed model agrees well withexperimental results of the columns confined by FRP sheets reported by other researchers. In general,it is found that the strength of the lap splice increases with increasing lap splice length, cover to bardiameter ratio and number of the FRP sheets.
References
Alsiwat, J.M. and Saatcioglu, M. (1992).Reinforcement anchorage slip undermonotonic loading. J. Struct. Eng., 118(9):2421-2438.
Bousias, S., Spathis, A-L., and Fardis, N.M.(2006). Concrete or FRP jacketing ofcolumns with lap splices for seismicrehabilitation. J. Adv. Concr. Technol.,4( 3):431-444.
Chai, Y., Priestley, M., and Seible, F. (1991).Seismic retrofit of circular bridge columnsfor enhanced flexural performance. ACIStruct. J., 88(5):572-584.
Eligehausen, R., Popov, E.P., and Bertero, V.V.(1983). Local bond stress-slip relationshipsof deformed bars under generalizedexcitations. Earthquake EngineeringResearch Center, University of California,Berkeley, Report No. UCB/EERC-83/23.
Harajli, M.H. (2006). Effect of confinementusing steel, FRC, or FRP on the bondstress-slip response of steel bars undercyclic loading. Mater. Struct., 39:621–634.
Harajli, M.H. and Dagher, F. (2008). Seismicstrengthening of bond-critical regions inrectangular reinforced concrete columnsusing fiber-reinforced polymer wraps. ACIStruct. J., 105(1):68-77.
Harajli, M.H., Hantouche, E., and Soudki, K.(2006). Stress-strain model for fiberreinforcedpolymer jacketed concretecolumns. ACI Struct. J., 103(5):672-682.
Harries, K., Ricles, J.M., Pessicki, S., and Sause,R. (2006). Seismic retrofit of lap splices innonductile columns using CFRP jackets.ACI Struct. J., 103(6):226-236.
Hassan, F.M. and Hawkins, N.M. (1977).Prediction of the seismic loading anchoragecharacteristics of reinforced bars. ACISP-53:417-438.
Ma, R., Xiao, Y., and Li, K.N. (2000). Full-scaletesting of a parking structure columnretrofitted with carbon fiber reinforcedcomposites. Constr. Build. Mater., 14(2):63-71.
Maekawa, K., Pimanmas, A., and Okamura, H.(2003). Nonlinear Mechanics of ReinforcedConcrete. Spon Press, London, 721p.
Melek, M., Wallace, J., and Conte, J. (2003).Experimental Assessment of Columnswith Short Lap-Splice Subjected to CyclicLoads. PEER Report 2003/04, PacificEarthquake Engineering Research Center,University of California, Berkeley, CA.
Murayama, Y., Suda, K., and Mimura, C. (1986).Post-yielding bond-slip and stress-strainrelationships of reinforcing bars embeddedin massive concrete. Proceedings of the8th Japan Concrete Institute (JCI) Conference(in Japanese).
Park, R. and Paulay, T., (1975). ReinforcedConcrete Structures. John Wiley & Sons,New York, NY, 800p.
Sezen, H. and Moehle, J.P. (2003). Bond-slipbehavior of reinforced concrete members.fib Symposium (CEB-FIP); ConcreteStructures in Seismic Regions; May 6-92003; Athens, Greece.
Shima, H., Chou, L.L., and Okamura, H. (1987).Bond characteristics in post-yield rangeof deformed bars. Concrete Library ofJSCE, 10:113-124.
Xiao, Y. and Ma, R. (1997). Seismic retrofit of RCcircular columns using prefabricatedcomposite jacketing. J. Struct. Eng.,123(10):1357-1364.
