Seismic performance of concrete core walls reinforced with shape memory alloy bars

Abraik, Emad; El-Fitiany, Salah El-Din F.; Youssef, Maged A.

doi:10.1016/j.istruc.2020.07.053

Cited by 12 publications

(4 citation statements)

References 22 publications

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“…The results showed that the after yielding, distortion of the SMA RC column was almost fully recovered. Abraik et al (2020) investigated the seismic performance of concrete core walls reinforced with Ni-Ti SMA rebars in terms of residual displacement, floor acceleration, and residual in-plane rotation. They concluded that the SMA RC wall experienced lower floor accelerations, residual displacements, and residual in plane rotation than concrete wall reinforced with steel rebar.…”

Section: Sma Alloymentioning

confidence: 99%

Mechanical properties and constitutive models of shape memory alloy for structural engineering: A review

Mohammadgholipour

Billah

2023

Journal of Intelligent Material Systems and Structures

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Shape Memory Alloys (SMAs) are an innovative material with the unique features of superelasticity and energy dissipation capabilities under extreme loads. Due to their unique features, they have a great potential to be employed in structural engineering applications under different conditions. However, in order to effectively use SMAs in civil engineering structures and model their behaviors accurately in Finite Element (FE) packages, it is crucial for structural engineers to comprehend the mechanical properties and cyclic behavior of different SMA compositions under varying loading conditions. While previous studies have focused mainly on the cyclic behavior of SMAs under tensile loading, it is important to evaluate their fatigue behavior under cyclic tension-compression loading for seismic applications. This literature review aims to discuss the current gaps in the existing literature on the behavior of SMA rebars under low-cycle fatigue (LCF). The review provides a comprehensive overview of the primary characteristics of SMAs, summarizes the mechanical properties of SMAs presented in the literature and the parameters that affect them, and critically evaluates the effects of cyclic loading and LCF on SMAs. The review also provides a summary of the different constitutive models of SMAs and compares their advantages and limitations, which helps structural engineers to employ an appropriate constitutive model for predicting the accurate behavior of SMAs in FE software.

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Section: Sma Alloymentioning

confidence: 99%

Mechanical properties and constitutive models of shape memory alloy for structural engineering: A review

Mohammadgholipour

Billah

2023

Journal of Intelligent Material Systems and Structures

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“…The Ni-Ti SMA enables displacement recovery through the shape memory effect, which returns to its original shape above a specific temperature threshold, and the superelastic ability, which returns to its initial state without residual deformation even after surpassing the yield point [21][22][23]. A recent study was conducted to enhance the seismic performance of concrete walls by considering the introduction of SMA bars to replace conventional steel bars in structural members [24][25][26][27]. However, the high production costs associated with SMA bars pose an economic challenge compared to conventional steel bars.…”

Section: Introductionmentioning

confidence: 99%

Development and Performance Evaluation of a Mechanical Connection for Steel and Shape Memory Alloy Bars

Song,

Choi,

Lee

2024

Metals

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Shape memory alloys (SMAs) demonstrate a shape memory effect and superelasticity that can provide recovery performance to structural members. In this study, a round SMA bar was designed to replace the conventional deformed steel bar, particularly within the plastic hinge section of structural members. To integrate the SMA bar and the existing steel bar, a mechanical coupler was proposed by utilizing the advantages of both one-touch and threaded couplers. Uniaxial tensile tests were conducted to analyze the performance of the proposed coupler and the mechanical properties of the SMA–steel connected bar. Stress and strain relationships were examined for steel bars mechanically connected with the SMA bar and for SMA bars before and after exhibiting the shape memory effect. To induce the shape memory effect, SMA should be heated above the finished austenite temperature. Due to the difficulty of accurately measuring strain on the heated bar using traditional contact methods, we employed digital image correlation technology for precise strain measurement of the heated SMA bar. The experimental results indicate the effective application of SMA bars within the plastic hinge region of structural members using the proposed mechanical coupler.

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“…ese materials can eliminate large deformations and are resistant to corrosion and fatigue [20]. Due to these advantages, SMA materials are considered as a new material for structural engineering applications [21,22]. To date, SMA materials have been widely used in the construction industry as bolts and structural shapes in steel buildings [23,24] and SMA bars in reinforced concrete buildings [25,26].…”

Section: Introductionmentioning

confidence: 99%

Analytical and Numerical Investigation of Knee Brace Equipped with a Shape Memory Alloy Damper

Shakiba

Mortazavi

2022

Shock and Vibration

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Shape memory alloys (SMAs) are some of the new materials that have attracted the attention of many engineers due to their unique behavior. The most important advantage of these materials is their superelastic behavior, which allows the alloy to return to its original shape after a large deformation. In superelastic behavior, the shape memory alloy can also dissipate a significant amount of energy while returning to its original shape. In this research, the superelastic alloy made of nitinol has been used to improve the performance of knee dampers. For this purpose, a frame equipped with a knee damper was selected as the reference model and was modelled in Abaqus numerical software and validated with an experimental model. After ensuring the correct behavior of the numerical model, the SMA damper was installed perpendicular to the knee damper, between the knee damper and the beam to column connection. In this paper, two parameters of the SMA damper cross section area and SMA length were investigated. Based on the observed results, increasing the length of SMA increases the system resistance. As the cross section area of the SMA damper increases, the effect of the SMA length on the resistance of the system increases. On the other hand, increasing the cross section area of the SMA significantly increases the recentering of the system. Due to the significant recentering that the SMA damper creates in the structure, the amount of energy dissipation of the system is reduced compared to the reference model. The amount of dissipated energy depends on the length and cross section area of the SMA damper. Thus, the longer the SMA, the greater the energy dissipation, and the lower the SMA cross section area, the lower the system energy dissipation.

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Seismic performance of concrete core walls reinforced with shape memory alloy bars

Cited by 12 publications

References 22 publications

Mechanical properties and constitutive models of shape memory alloy for structural engineering: A review

Mechanical properties and constitutive models of shape memory alloy for structural engineering: A review

Development and Performance Evaluation of a Mechanical Connection for Steel and Shape Memory Alloy Bars

Analytical and Numerical Investigation of Knee Brace Equipped with a Shape Memory Alloy Damper

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