Applications of shape memory alloys in structural engineering with a focus on concrete construction – A comprehensive review

Molod, Mohammad Amin; Spyridis, Panagiotis; Barthold, Franz‐Joseph

doi:10.1016/j.conbuildmat.2022.127565

Cited by 34 publications

(8 citation statements)

References 83 publications

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“…Although SMAs have been recognized for decades, they were not commonly used in the building sector until rather recently. Over the past two decades, some researchers presented several reviews in the literature [ 63 , 64 , 65 , 66 , 67 , 68 , 69 , 70 , 71 , 72 , 73 , 74 ] on applications of SMAs in civil infrastructures. The percentage distribution of applications based on the distinctive properties of SMAs is distributed among five major applications: self-centering, retrofitting, self-healing, prestressing, and fire protection, as shown in Figure 18 a.…”

Section: Application Of Niti Smas In Civil Infrastructuresmentioning

confidence: 99%

Superelastic Nickel–Titanium (NiTi)-Based Smart Alloys for Enhancing the Performance of Concrete Structures

2023

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Recent advances in materials science have led to the development of smart materials that can continuously adapt to different loading conditions and changing environment to meet the growing demand for smart structural systems. The unique characteristics of superelastic NiTi shape memory alloys (SMAs) have attracted the attention of structural engineers worldwide. SMAs are metallic materials that can retrieve their original shape upon exposure to various temperatures or loading/unloading conditions with minimal residual deformation. SMAs have found increasing applications in the building industry because of their high strength, high actuation and damping capacities, good durability, and superior fatigue resistance. Despite the research conducted on the structural applications of SMAs during the previous decades, the existing literature lacks reviews on their recent uses in building industry such as prestressing concrete beams, seismic strengthening of footing–column connections, and fiber-reinforced concrete. Furthermore, scarce research exists on their performance under corrosive environments, elevated temperatures, and intensive fires. Moreover, the high manufacturing cost of SMA and the lack of knowledge transfer from research to practice are the main obstacles behind their limited use in concrete structures. This paper sheds light on the latest progress made in the applications of SMA in reinforced concrete structures during the last two decades. In addition, the paper concludes with the recommendations and future opportunities associated with expanding the use of SMA in civil infrastructures.

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Section: Application Of Niti Smas In Civil Infrastructuresmentioning

confidence: 99%

Superelastic Nickel–Titanium (NiTi)-Based Smart Alloys for Enhancing the Performance of Concrete Structures

2023

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“…Different implementation manners have been explored, such as being near-surface mounted (NSM), embedded in the additional shotcrete or mortar layer and externally applied. 26,27 When concrete beams are strengthened by utilizing SMAs, the SME needs to be thermally activated by resistive heating, infrared, fire torch, etc. As the implemented SMAs are affixed to the strengthened beams, the tendency of activated SMAs to recover their deformation is hindered, resulting in the generation of recovery stress that introduces prestressing force to the concrete.…”

Section: Introductionmentioning

confidence: 99%

“…Flexural strengthening has been a primary application of SME in concrete structures. Different implementation manners have been explored, such as being near‐surface mounted (NSM), embedded in the additional shotcrete or mortar layer and externally applied 26,27 . When concrete beams are strengthened by utilizing SMAs, the SME needs to be thermally activated by resistive heating, infrared, fire torch, etc.…”

Section: Introductionmentioning

confidence: 99%

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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“…SMA bolts are reported in [45] to enable an improvement in the initial stiffness, shear resistance and energy dissipation capability of steel beam-column joints. Regarding concrete structures, Molod et al [46] provide a comprehensive literature review of SMA applications. Varela [47] presents nickel-titanium (NiTi) SMA bars as a connection tool to link reinforced concrete (RC) columns to the concrete footing.…”

Section: Introduction 1motivation Fundamental Principles and Backgrou...mentioning

confidence: 99%

Minimally Invasive Retrofitting of RC Joints with Externally Applied SMA Plate—Adaptive Design Optimisation through Probabilistic Damage Simulation

2023

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Beam–column joints are the critical section of many reinforced concrete (RC) structure types in which any failure could lead to the collapse of the entire structure. This paper attempts to employ a superelastic shape memory alloy plate as an innovative and adaptive external strengthening element to rehabilitate existing concrete beam–column joints and enhance the structure’s performance. An experimentally investigated beam–column joint is used as the case study, and it is investigated numerically to validate the effects of an innovative strengthening technique based on shape memory alloys. The results show that the proposed technique could increase the joint’s stiffness and reduce the risk of overall failure. A particular innovation in the proposed method is associated with the novel material itself but also with the fact that the increased potential costs of using special alloys are counteracted by its potential to produce these elements in an optimised industrially produced fastened plate. This fits-all construction product further allows a rapid and minimally invasive strengthening technique. Moreover, to achieve this, the plate is adaptively designed against random critical load combinations through probabilistic damage prediction.

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Applications of shape memory alloys in structural engineering with a focus on concrete construction – A comprehensive review

Cited by 34 publications

References 83 publications

Superelastic Nickel–Titanium (NiTi)-Based Smart Alloys for Enhancing the Performance of Concrete Structures

Superelastic Nickel–Titanium (NiTi)-Based Smart Alloys for Enhancing the Performance of Concrete Structures

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

Minimally Invasive Retrofitting of RC Joints with Externally Applied SMA Plate—Adaptive Design Optimisation through Probabilistic Damage Simulation

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