Superelastic NiTi SMA cables: Thermal-mechanical behavior, hysteretic modelling and seismic application

Fang, Cheng; Zheng, Yue; Chen, Junbai; Yam, Michael C.H.; Wang, Wei

doi:10.1016/j.engstruct.2019.01.049

Cited by 155 publications

(99 citation statements)

References 35 publications

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“…When the austenite finish temperature A f is lower than the room temperature, SMA exhibits superelasticity under an external force. The ambient temperature should preferably be between A f and A f + 40 ℃ [ 36 ]; however, A f is usually higher than room temperature. Therefore, A f should be reduced by carrying out different heat treatments in order to achieve the desirable superelasticity for SMA wires.…”

Section: Introductionmentioning

confidence: 99%

Investigation of Mechanical Properties of Large Shape Memory Alloy Bars under Different Heat Treatments

et al. 2020

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Shape memory alloys (SMAs) are a class of functional materials that possess unique thermomechanical properties, such as shape memory effect (SME), superelasticity (SE), damping, and good fatigue and corrosion resistance, which enable them to become ideal materials for applications in earthquake engineering. Numerous studies have shown that the mechanical properties of superelastic SMAs mainly depend on the wire form, or the relationship between the microstructure and thermally induced phase transitions. However, extremely few studies have elucidated the effects of the heat-treatment strategy, size effect of large diameters, and cyclic loading. Herein, the mechanical properties of SMA bars, such as residual strain, energy dissipation, and equivalent damping ratio, were studied with different heat-treatment strategies, cyclic loadings, and strain amplitudes; this was achieved by conducting cyclic tensile tests on SMA bars with four different diameters. The results indicate that the maximum phase transformation stress was obtained with a 14 mm SMA bar subjected to heat treatment at 400 ℃ for 15 min. The mechanical properties were relatively stable after five loading–unloading cycles, which should be considered in engineering applications. The test results provide a mechanical basis for using large SMA bars in self-centering structures in seismic regions.

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Section: Introductionmentioning

confidence: 99%

Investigation of Mechanical Properties of Large Shape Memory Alloy Bars under Different Heat Treatments

et al. 2020

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“…are used to connect the SMA rebar with a steel rebar (Figure 3B). The SMA cables are used as restrainers, which can be prepared with the bundled straight SMA wires 35,40 or helically wrapped SMA wires 48 . The cable restrainers are connected from the bottom of the girders to the pier cap with the help of steel hooks.…”

Section: Case Studymentioning

confidence: 99%

“…It is assumed that the median value of EDP follows a lognormal probability distribution 48

\ln (E D P) = \ln (a) + b \ln false(I M false),

…”

Section: Seismic Fragility Analysismentioning

confidence: 99%

Seismic performance assessment of a multispan continuous isolated highway bridge with superelastic shape memory alloy reinforced piers and restraining devices

Wang

Alam

2020

Earthq Engng Struct Dyn

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The objective of this study is to analytically determine the effectiveness of a novel bridge system with superelastic (SE) shape memory alloy (SMA) reinforced concrete piers. The bridge is also equipped with SE SMA cable restrainers to prevent the bridge spans from a large displacement that can potentially cause span unseating. In the concrete bridge piers, the conventional steel reinforcements in the plastic hinge regions are replaced with SE SMA rebar to avoid large plastic deformation and improve its self-centering capacity. A typical three-span continuous highway bridge is modeled with SMA-reinforced piers and SMA restrainers. Numerical simulations of the bridge are conducted under destructive near-fault ground motions. The seismic responses and fragility curves of the novel bridge (Bridge IV) are assessed and compared with the reference bridge (Bridge I), the bridge with only SMA-reinforced piers (Bridge II), and the bridge with only SMA restrainers (Bridge III). The results revealed that the SMA-reinforced pier can successfully reduce the residual deformation and damage probability of the bridge; however, the bridge with only SMAreinforced piers is less efficient in preventing a large displacement. The use of SMA restrainers can efficiently limit the displacement of the bridge spans but increase the damage probability of the bridge piers. The proposed novel bridge having SMA-reinforced piers equipped with SMA restrainers (Bridge IV) is more efficient than the bridge with only SMA-reinforced piers (Bridge II)) or the bridge with only SMA restrainers (Bridge III).

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“…Recently, SMAs, a class of metallic smart materials with different diameters and compositions (Abdulridha and Palermo, 2017; Fang et al, 2019; Mas et al, 2017; Navarro-Gómez and Bonet, 2019; Pareek et al, 2018), are emerging as an effective option for prestressing concrete (PC) structures, thanks to a unique microstructurally based thermomechanical phenomenon of SMA known as shape memory effect (SME) (Czaderski et al, 2014; Deng et al, 2006; El-Tawil and Ortega-Rosales, 2004; Hong et al, 2018; Li et al, 2007; Rius et al, 2017; Rojob and El-Hacha, 2017; Sawaguchi et al, 2006; Shahverdi et al, 2016; Soroushian et al, 2001; Zerbe et al, 2017). SME is described as the ability of SMA to recover its original shape, when heated, after being subjected to extreme deformation beyond the elastic range.…”

Section: Concrete Prestressing Using Smasmentioning

confidence: 99%

Local strengthening and repair of concrete bridge girders using shape memory alloy precast prestressing plate

Zhao

Andrawes

2020

Journal of Intelligent Material Systems and Structures

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Whether due to accidents, natural hazards, or harsh environmental conditions, concrete structures and bridges, in particular, experience local damages throughout their service life. Based on their severity, these damages can compromise the integrity of the structure. External prestressing is often used as an effective strengthening or repair technique for vulnerable or damaged structures, respectively. However, applying external prestressing in local regions of the structure with limited space can be problematic and not feasible for conventional prestressing techniques. This study investigates an innovative method for applying external prestressing in local regions of bridge girders using externally mounted precast prestressing plate reinforced with shape memory alloy wires. A thin mortar plate with embedded curved shape memory alloy wire was experimentally tested to validate the proposed prestressing concept. Afterward, finite element analysis was performed on a concrete bridge girder to numerically investigate the performance of shape memory alloy precast prestressing plate in enhancing the shear and flexural behavior of the girder. Experimental and numerical results evidently demonstrated the feasibility and effectiveness of the innovative method in strengthening and repairing concrete structures through external local prestressing.

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Superelastic NiTi SMA cables: Thermal-mechanical behavior, hysteretic modelling and seismic application

Cited by 155 publications

References 35 publications

Investigation of Mechanical Properties of Large Shape Memory Alloy Bars under Different Heat Treatments

Investigation of Mechanical Properties of Large Shape Memory Alloy Bars under Different Heat Treatments

Seismic performance assessment of a multispan continuous isolated highway bridge with superelastic shape memory alloy reinforced piers and restraining devices

Local strengthening and repair of concrete bridge girders using shape memory alloy precast prestressing plate

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