Experimental flexural behavior of SMA-FRP reinforced concrete beam

Abstract

The most critical drawback in currently used steel reinforcement in reinforced concrete (RC) structures is susceptibility to accumulation of plastic deformation under excessive loads. Many concrete structures due to damaged (yielded) steel reinforcement have undergone costly repairs and replacements. This research presents a new type of shape memory alloy (SMA)-based composite reinforcement with ability to withstand high elongation while exhibiting pseudo-elastic behavior. In this study, small diameter SMA wires are embedded in thermoset resin matrix with or without additional glass fibers to develop composite reinforcement. Manufacturing technique of new proposed composite is validated using microscopy images. The proposed SMA-FRP composite square rebars are first fabricated and then embedded in small scale concrete T-beam. 3-point bending test is conducted on manufactured RC beam using a cyclic displacement controlled regime until failure. It is found that the SMA-FRP composite reinforcement is able to enhance the performance of concrete member by providing re-centering and crack closing capability.

Keywords

re-centering / shape memory alloys / concrete / composite / fiber reinforced polymer / scanning electron microscopy

References

[1] DesRoches R, McCormick J, Delemont M. Cyclic properties of superelastic shape memory alloy wires and bars. Journal of Structural Engineering, 2004, 130(1): 38–46

[2] Penar B W. Recentering beam column connections using shape memory alloys. Master Thesis. Atlanta: Georgia Institute of Technology, 2005

[3] Nehdi M, Shahria Alam M, Youssef M A. Development of corrosion-free concrete beam column joint with adequate seismic energy dissipation. Engineering Structures, 2009, 32(9): 2518–2528

[4] Shin M, Andrawes B. Experimental investigation of actively confined concrete using shape memory alloys. Engineering Structures, 2010, 32(3): 656–664

[5] Rogers C, Liang C, Jia J. Structural modification of simply-supported laminated plates using embedded shape memory alloy fibers. Computers & Structures, 1991, 38(5–6): 569–580

[6] Paine J S N, Rogers C A. Shape memory alloys for damage resistant composite structures. Active Materials and Smart Structures, 1995, 2427(1): 358–371

[7] Xu Y, Toyama N, Yoshida H, Kishi T. A novel technique for fabricating SMACFRP adaptive composites using ultrathin TiNi wires. Smart Materials and Structures, 2002, 12: 196–202

[8] Sterzla T, Winzek B. Bistable shape memory thin film actuators. Smart Structures and Materials 2003: Active Materials: Behavior and Mechanics. In: Proceedings of the Society for Photo-Instrumentation Engineers. 2003, 5053(1): 101–109

[9] Jonnalagadda K, Sottos N, Qidwai M, Lagoudas D.Transformation of embedded shape. Journal of Intelligent Material Systems and Structures, 1998, 9

[10] Wei Z G, Sandstrom R, Miyazaki S. Shape memory materials and hybrid composites for smart systems Part II Shape-memory hybrid composites Part II Shape memory hybrid composites. Journal of Materials Science, 1998, 33(15): 3763–3783

[11] Zhang R X, Ni Q Q, Natsuki T, Iwamoto M. Mechanical properties of composites filled with SMA particles and short fibers. Composite Structures, 2007, 79(1): 90–96

[12] Wierschem N, Andrawes B. Superelastic SMA-FRP composite reinforcement for concrete structures. Smart Materials and Structures, 2010, 19(2): 13

[13] Zafar A, Andrawes B. Incremental dynamic analysis of concrete moment resisting frames reinforced with shape memory composite bars. Journal of Smart Materials & Structures, 2012, 21(2): 14

[14] Zafar A, Andrawes B. Fabrication and cyclic behavior of highly ductile superelastic shape memory composites. Journal of Materials in Civil Engineering, 2013 (in press)

[18] Liu Y, Xie Z, Humbeeck J V, Delaey L. Asymmetry of stress-strain curves under tension and compression for NiTi shape memory alloys. Acta Materialia. 1998, 46(12): 4325–4338

[19] Lim T J, McDowell D L. Mechanical behaviour of an Ni-Ti shape memory alloy under axial-torsional proportional and non-proportional loading. Journal of Engineering Materials and Technology. 1999, 121: 9–18

[15] Mazzoni S. Open System for Earthquake Engineering Simulation (OpesSees). OpenSees Command Language Manual (Berkeley, CA: Pacific Earthquake Engineering Research Center, University of California), 2009

[16] American standards for testing materials (ASTM). ASTM C305: Standard practice for mechanical mixing of hydraulic cement pastes and mortars of plastic consistency, ASTM, West Conshohohoken, PA, 2012

[17] American standards for testing materials (ASTM). ASTM C109: Standard test method for compressive strength of hydraulic cement mortars. ASTM, West Conshohohoken, PA, 2013

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2014 Higher Education Press and Springer-Verlag Berlin Heidelberg