Experimental flexural behavior of SMA-FRP reinforced concrete beam

doi:10.1007/s11709-013-0221-y

Front Struc Civil Eng

2013, Vol. 7

Issue (4) : 341-355 https://doi.org/10.1007/s11709-013-0221-y

RESEARCH ARTICLE

Experimental flexural behavior of SMA-FRP reinforced concrete beam

Adeel ZAFAR(

), Bassem ANDRAWES

Department of Civil Engineering, University of Illinois at Urbana-Champaign, Illinois 61820, USA

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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

Corresponding Author(s): ZAFAR Adeel,Email:zafar2@illinois.edu

Issue Date: 05 December 2013

Cite this article:

Adeel ZAFAR,Bassem ANDRAWES. Experimental flexural behavior of SMA-FRP reinforced concrete beam[J]. Front Struc Civil Eng, 2013, 7(4): 341-355.

URL:

https://academic.hep.com.cn/fsce/EN/10.1007/s11709-013-0221-y
https://academic.hep.com.cn/fsce/EN/Y2013/V7/I4/341

Fig.1 Schematic drawing. (a) 100% SMA composite rebar cross-section; (b) Stress-strain hysteresis of superelastic SMA

Tab.1 Fiber volume fraction of SMA-FRP composite specimens

Fig.2 Comparison of stress strain curves of FRC and PRC specimens

Fig.3 Cyclic stress-strain curve of FRC-13 specimen

Fig.4 SEM images of PRC specimen at 200X magnification. (a) SE; (b) BSE

Fig.5 SEM images of PRC composite. (a) BSE image with 200X; (b) SE image with 5000X; (c) BSE image with 1200X; (d) BSE image with 5000X

Fig.6 SEM images of PRC composite with 25000X magnification

Fig.7 Schematics of designed T-beam with cross sectional dimensions

Tab.2 Concrete mix design

Fig.8 Casting of small scale T-beam with embedded SMA composite rebar

Fig.9 Layout of the silicone mold for manufacturing of square SMA-FRP rebar

Fig.10 Schematics of layout of SMA-FRP composite rebars

Tab.3 FVF of manufactured SMA-FRP composite rebars

Fig.11 Location of measuring instruments on RC T-beam

Fig.12 Actual test setup and instrumentation

Fig.13 Load versus mid span deflection plots of T-beam. (a) Cycle-1; (b) Cycle-2; (c) Cycle-3; (d) Cycle-4

Fig.14 Crack mouth opening displacement plots of T-beam. (a) Cycle-1; (b) Cycle-2; (c) Cycle-3; (d) Cycle-4

Fig.15 Stages of T-beam test. (a) Point-; (b) point- (c); point-; (d) point-

Tab.4 Test data at various points

Tab.5 Test data for strain gauges at various points

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