Prestressing effect of embedded Fe-based SMA wire on the flexural behavior of mortar beams

Choi, Eunsoo; Ostadrahimi, Alireza; Kim, Woo Jin; Seo, Junwon

doi:10.1016/j.engstruct.2020.111472

Cited by 19 publications

(10 citation statements)

References 38 publications

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“…The feasibility of Fe-SMAs in the domain of civil engineering has been confirmed by early research [2,82,92,93,95], and some scholars attempt to apply it to the reinforcement of small-scale specimens [2,63,90,97,112,113].…”

Section: Application On Reinforcement Of Small-scale Specimensmentioning

confidence: 98%

“…The activation method is a critical technology in the process of reinforcement. At present, with the in-depth research on Fe-SMAs, the activation methods of alloys have become more abundant, including thermal resistance heating [6,32,90,[94][95][96], climate chamber heating [2,6,82,89,92,93,[96][97][98][99], flexible tape heating (Figure 8a) [100][101][102][103], infrared radiation heating [1,96,104,105], heat gun heating [3,63,91], flame heating [4], inductive coil heating [106], electric furnace heating (Figure 8b) [96,107], autoclave heating [96] and so on. In general, it is necessary to determine the specific activation method according to the characteristics of the beams and the environment.…”

Section: Reinforcement Mechanism Of Rc Bridges With Fe-smasmentioning

confidence: 99%

“…In the early studies [63,94,109,110], Fe-SMA wires or chips with different spatial shapes, as shown in Figure 9 [111], were embedded in plaster or mortar matrix to improve the tensile strength and cracking load [112], which was affected by the idea of Ni-Ti SMAs application [11,113,114]. Research on the reinforcement of RC beams has experienced a considerable boost in recent years [101].…”

Section: Summary Of Reinforcement Techniquesmentioning

confidence: 99%

“…Czaderski et al [2] introduced the feasibility of using ribbed Fe-SMA strips instead of FRP strips for near-surface mounted reinforcement and found that the activated Fe-SMA strips could generate recovery stress of 200~300 MPa and had sufficient bond stress with grouting mortar. Recently, Choi et al [63] reported the flexural failure modes and crack patterns of the three-point bending test of mortar beams reinforced with activated and unactuated Fe-19Mn-4Si-8Cr-4Ni-0.01C (at.%) alloy wires. The cracking load and ductility of the activated reinforced beam increased by 45% and 2.1 times compared to the unactivated reinforced beam, respectively.…”

Section: Application On Reinforcement Of Small-scale Specimensmentioning

confidence: 99%

See 3 more Smart Citations

Achievements and Perspectives on Fe-Based Shape Memory Alloys for Rehabilitation of Reinforced Concrete Bridges: An Overview

2022

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Reinforced concrete (RC) bridges often face great demands of strengthening or repair during their service life. Fe-based shape memory alloys (Fe-SMAs) as a kind of low-cost smart materials have great potential to enhance civil engineering structures. The stable shape memory effect of Fe-SMAs is generated by, taking Fe-Mn-Si alloys as an example, the martensite transformation of fcc(γ) → hcp(ε) and its reverse transformation which produces considerable recovery stress (400~500 MPa) that can be used as prestress for reinforcement of RC bridges. In this work, the mechanism, techniques, and applications of Fe-SMAs in the reinforcement of RC beams in the past two decades are classified and introduced in detail. Finally, some new perspectives on Fe-SMAs application in civil engineering and their expected evolution are proposed. This paper offers an effective active rehabilitation alternative for the traditional passive strengthening method of RC bridges.

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Section: Application On Reinforcement Of Small-scale Specimensmentioning

confidence: 98%

Section: Reinforcement Mechanism Of Rc Bridges With Fe-smasmentioning

confidence: 99%

Section: Summary Of Reinforcement Techniquesmentioning

confidence: 99%

Section: Application On Reinforcement Of Small-scale Specimensmentioning

confidence: 99%

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Achievements and Perspectives on Fe-Based Shape Memory Alloys for Rehabilitation of Reinforced Concrete Bridges: An Overview

2022

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“…This great motivation leads to researchers coming up with various bending analysis via several experimental, numerical, and analytical studies in literatures. In terms of experimental and numerical works, several researchers [5][6][7][8][9][10][11][12][13][14][15][16][17] predicted bending stress distribution of SMA beams. Moreover, Refs.…”

Section: Introductionmentioning

confidence: 99%

Effect of Tension-Compression Asymmetry Response on the Bending of Prismatic Martensitic SMA Beams: Analytical and Experimental Study

2021

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This paper aims to analytically derive bending equations, as well as semi-analytically predict the deflection of prismatic SMA beams in the martensite phase. To this end, we are required to employ a simplified one-dimensional parametric model considering asymmetric response in tension and compression for martensitic beams. The model takes into account the different material parameters in martensite twined and detwinned phases as well as elastic modulus depending on the progress of the detwinning process. In addition, the model considers the diverse slope of loading and unloading in martensite detwinned phases favored by tension and compression. To acquire general bending equations, we first solve the pure bending problem of a prismatic SMA beam. Three different phases are assumed in the unloading procedure and the effect of neutral fiber distance from the centerline is also considered during this stage. Then according to the pure bending solution and employing semi-analytical methods, general bending equations of an SMA beam are derived. Polynomial approximation functions are utilized to obtain the beam deflection–length relationship. To validate the attained analytical expressions, several three- and four-point bending tests were conducted for rectangular and circular SMA beams. Experimental data confirm the reasonable accuracy of the analytical results. This work may be envisaged to go deep enough in investigating the response of SMA beams under an arbitrary transverse loading and stress distribution during loading and unloading, as well as findings may be applicable to a good prediction of bending behavior.

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Integrating near‐surface mounted SMA and externally bonded CFRP for concrete beams strengthened in flexure

Zhu

Deng

Jiang

2023

Structural Concrete

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This study aims to develop a new hybrid strengthening approach for reinforced concrete beams by integrating near‐surface mounted shape memory alloys (SMAs) and externally bonded carbon fiber reinforced polymers (CFRPs). Due to the superelasticity and shape memory effect of SMAs, the proposed strengthening can enhance the flexural strength of concrete beams without compromising ductility. The recovery behavior of deformed SMA wires was studied to determine the optimal prestrain level that can achieve the highest recovery stress. Afterward, the flexural performance of concrete beams strengthened with SMA, CFRP and both was investigated by performing three‐point tests. The results show that integrating SMA and CFRP has more influence on increasing the ultimate moment than the cracking moment and leads to a more significant improvement in the ultimate moment than individually utilizing SMA and CFRP. Besides, the effect of the integrated approach on enhancing the ductility is more notable than increasing the ultimate moment. The ultimate moment was analytically calculated, and the calculations show reasonable agreement with experimental results. The effects of the SMA and CFRP amount on the ultimate moment were also clarified through a parametric study.

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Prestressing effect of embedded Fe-based SMA wire on the flexural behavior of mortar beams

Cited by 19 publications

References 38 publications

Achievements and Perspectives on Fe-Based Shape Memory Alloys for Rehabilitation of Reinforced Concrete Bridges: An Overview

Achievements and Perspectives on Fe-Based Shape Memory Alloys for Rehabilitation of Reinforced Concrete Bridges: An Overview

Effect of Tension-Compression Asymmetry Response on the Bending of Prismatic Martensitic SMA Beams: Analytical and Experimental Study

Integrating near‐surface mounted SMA and externally bonded CFRP for concrete beams strengthened in flexure

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