Behavior and modeling of superelastic shape memory alloy reinforced concrete beams

Abdulridha, Alaa; Palermo, Dan; Foo, Simon; Vecchio, Frank J.

doi:10.1016/j.engstruct.2012.12.041

Cited by 134 publications

(34 citation statements)

References 24 publications

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“…Abdulridha et al [17] has evaluated the compatibility of SMAs as alternative reinforcement in RC structures. They concluded that SMA has shown structural characteristics such as exhibits yielding and strain hardening while sustaining large After all, SMA has the potential characteristics to be substituted reinforcement for reinforced concrete structures as it has significant enhancement in crack recovery capacity compared to steel reinforcing bars.…”

Section: Self-healing Effectsmentioning

confidence: 99%

Self-healing Shape-Memory Alloy (SMA) in Reinforced Concrete Structures: A Review

2016

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The presence of shape-memory alloy (SMA) in civil engineering fields was an eye-opener for researchers to develop better technology which can aid in various related aspects. The superiority of SMA over others is that it has a special capability where it remembers the previous shape and is able to return back to its original shape after being heated. The usage of SMA is tremendous in other applications such as in medical, dentistry, and also in automotive and robotic. However, SMA in structural applications can be considered as new and is still in research mode. Construction fields are always thirsty for new and fresh ideas to make improvements in existing technology. As the construction field has to face the possibility of natural disasters such as landslide, earthquake, and others, technologies are needed to reduce the total damages when such natural disasters occur. The existence of SMA as a new material in construction field gives positive vibes to researchers in creating a new technology. This paper explains the ability of SMA as a self-healing material and its unique properties of shape-memory effect and super-elasticity that are helpful in structural applications. The use of SMAs in reinforced concrete structures has been reviewed to clearly understand its mechanism processes. Comparison between SMAs and regular reinforced concretes were made to distinguish the performance of SMA-reinforced structures. Other recognized issues related to SMA, which is seismic protection of buildings are also presented in this paper.

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Section: Self-healing Effectsmentioning

confidence: 99%

Self-healing Shape-Memory Alloy (SMA) in Reinforced Concrete Structures: A Review

2016

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“…Using finite element modeling, they investigated the effect of utilizing SMA bars in the plastic hinge regions of regular RC frames on seismic ductility and over‐strength factors. Abdulridha et al investigated the seismic performance of concrete beams with SMA bars in the critical regions over conventional beams. Their experiments showed that SMA beams had larger crack widths and crack spacing as compared to regular beams; however, they fully recovered upon load removal.…”

Section: Introductionmentioning

confidence: 99%

Seismic assessment of concrete buildings reinforced with shape memory alloy materials in different stories

Shiravand

Nashtaee

Veismoradi

2017

Structural Design Tall Build

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Summary Shape memory alloy (SMA) is a unique material with many beneficial characteristics such as superelasticity and excellent resistance against corrosion. However, the high expenses related to the material costs and difficulties associated with implementation of SMAs in reinforced concrete (RC) structures may limit their usage. To decrease the costs related to SMA installation, this paper investigates the seismic performance of RC moment‐resisting frames with the intention of specifying the optimal stories for SMA utilization. To this end, RC frames with 3, 5, 7, and 9 stories are modeled and various cases are considered for SMA locations in different story levels. For each building, 4 different cases are considered including a frame with regular steel reinforcement (Steel), a frame with SMAs in all story levels (full SMA), and 2 remaining cases consist of frames with SMAs in bottom and middle story levels only. In the first part, nonlinear dynamic time history analyses are conducted to evaluate the base shear, roof displacement, interstory, and residual drift demands of the structures using 10 ground‐motion records. In the second part, the incremental dynamic analysis is employed to assess the entire range of structural dynamic behavior. By using the generated data from incremental dynamic analysis procedure, fragility evaluation is conducted on multiple limit states to provide a comprehensive performance assessment for each case. The results indicate that frames with SMA in their lower story levels performed similar to frames equipped with SMA in all story levels. However, the fragility assessments show the better performance of frames with SMA in their bottom stories versus other cases. On this basis, the costs associated with SMA fabrication could be reduced noticeably (nearly two‐thirds) without sacrificing the overall performance of the frame and its post‐earthquake serviceability.

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“…The typical stress-strain response of the SMA loaded in the austenite phase exhibits hysteretic loop that has a flag-like shape, and brings the effects of energy dissipation and damping while still keeping its original shape. Many researchers have studied such phenomena for applications in civil structures such as dampers, base isolation devices, restrainers, and reinforcement for concrete [1,2,6,10,12,13,19,20,24,27 among many others].…”

Section: Background On Shape Memory Alloysmentioning

confidence: 99%

Sustainability of civil infrastructure using shape memory technology

Jung

Zafar²,

Andrawes

2017

Innov. Infrastruct. Solut.

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The last few decades have clearly demonstrated the vulnerability of our civil infrastructure systems to problems like aging, natural, and man-made hazards including earthquakes, hurricanes, blasts, etc. The conventional materials such as steel and concrete have proven to be limited in terms of their ability to withstand the extreme demands imposed on them by modern societies. The limitations in currently used construction materials combined with the consistently growing population worldwide present new challenges and demands for researchers in the field of structural engineering. Hence, there is an urgent need for new materials that are capable of extending the service life of structures with minimal or no need for maintenance or repairs against natural and manmade hazards. Shape memory alloy (SMA) is a class of ''Smart Materials'' that have recently emerged as potential construction material with unique thermomechanical properties, namely shape memory effect and superelasticity. Two applications of SMAs in civil structures are discussed in this paper. The first application involves the use of SMA in performing seismic rehabilitation of RC bridge columns that lack flexural ductility. In this application, SMA is used in the form of thermally prestressed spirals that can apply large active confinement pressure to the columns at their plastic hinge regions to improve their flexural ductility. The experimental results of large scale shake table tests performed on two RC columns, one of which is retrofitted with SMA are discussed. The results demonstrate the great ability of SMA spirals in mitigating the damage even under strong levels of ground shaking. The second application focuses on utilizing superelastic SMA fibers as reinforcement for polymeric composite bars. The newly developed composite material is named SMAFiber Reinforced Polymer (SMA-FRP), and is studied as seismic reinforcing bars for moment resisting concrete frames. The results of nonlinear time history analysis prove that using SMA-FRP bars at the plastic hinge regions of the frames helps significantly in limiting the residual drifts and enhancing the energy dissipation of the frames.

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Behavior and modeling of superelastic shape memory alloy reinforced concrete beams

Cited by 134 publications

References 24 publications

Self-healing Shape-Memory Alloy (SMA) in Reinforced Concrete Structures: A Review

Self-healing Shape-Memory Alloy (SMA) in Reinforced Concrete Structures: A Review

Seismic assessment of concrete buildings reinforced with shape memory alloy materials in different stories

Sustainability of civil infrastructure using shape memory technology

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