Characterization of cyclic properties of superelastic monocrystalline Cu–Al–Be SMA wires for seismic applications

Qiu, Can; Zhu, Songye

doi:10.1016/j.conbuildmat.2014.08.065

Cited by 79 publications

(57 citation statements)

References 37 publications

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“…SMAs refer to a special kind of metallic alloy that can recover from deformation upon heating (shape memory effect) or unloading (superelastic effect) . The most widely used SMA is Ni–Ti.…”

Section: Introductionmentioning

confidence: 99%

Shake table test and numerical study of self‐centering steel frame with SMA braces

Qiu

Zhu

2016

Earthq Engng Struct Dyn

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274

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Summary Given their excellent self‐centering and energy‐dissipating capabilities, superelastic shape memory alloys (SMAs) become an emerging structural material in the field of earthquake engineering. This paper presents experimental and numerical studies on a scaled self‐centering steel frame with novel SMA braces (SMAB), which utilize superelastic Ni–Ti wires. The braces were fabricated and cyclically characterized before their installation in a two‐story one‐bay steel frame. The equivalent viscous damping ratio and ‘post‐yield’ stiffness ratio of the tested braces are around 5% and 0.15, respectively. In particular, the frame was seismically designed with nearly all pin connections, including the pinned column bases. To assess the seismic performance of the SMA braced frame (SMABF), a series of shake table tests were conducted, in which the SMABF was subjected to ground motions with incremental seismic intensity levels. No repair or replacement of structural members was performed during the entire series of tests. Experimental results showed that the SMAB could withstand several strong earthquakes with very limited capacity degradation. Thanks to the self‐centering capacity and pin‐connection design, the steel frame was subjected to limited damage and zero residual deformation even if the peak interstory drift ratio exceeded 2%. Good agreement was found between the experimental results and numerical simulations. The current study validates the prospect of using SMAB as a standalone seismic‐resisting component in critical building structures when high seismic performance or earthquake resilience is desirable under moderate and strong earthquakes. Copyright © 2016 John Wiley & Sons, Ltd.

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Section: Introductionmentioning

confidence: 99%

Shake table test and numerical study of self‐centering steel frame with SMA braces

Qiu

Zhu

2016

Earthq Engng Struct Dyn

Self Cite

274

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“…Figure assembles the hysteresis shapes of three SMA wires upon cyclic loadings at room temperature, according to prior experimental studies . The cyclic rate is 1.0 Hz for CuAlBe and NiTi SMA wires, whereas the cyclic rate for FeNiCuAlTaB is yet to be known, and the dynamic loading effect needs further explorations. The diameters of NiTi‐ and CuAlBe‐based SMAs were 1.0 and 2.0 mm, respectively.…”

Section: Hysteresis Of Smasmentioning

confidence: 97%

“…The hysteretic shape of SMAs determines the seismic response of structures that use SMA‐based devices. According to prior experimental results, the mechanical properties of SMAs are sensitive to many parameters, including the chemical composition, processing method, ambient temperature, and alloy composition . Although loading rate also plays an important role in determining the hysteresis, the mechanical properties of SMAs were reported to be insensitive to loading rates that characterized by the typical frequency range of seismic loadings, mainly due to the heat exchange rate becomes saturated when SMAs are subjected to high‐frequency loadings.…”

Section: Hysteresis Of Smasmentioning

confidence: 99%

“…Shape memory alloys (SMAs) comprise a class of metal alloys with nearly ideal superelasticity and good damping behavior . Additionally, the high fatigue life makes SMAs promising material for vibration control problem .…”

Section: Introductionmentioning

confidence: 99%

“…It is worth noting that only one single type of SMA was specifically considered in previous studies on SMA‐based SCCBFs. In fact, different SMAs show noticeable variations in the hysteretic properties, and the associated effect on the seismic performance of SMA‐based structures has been rarely assessed. For example, Andrawes and DesRoches investigated the effect of hysteretic properties of SMAs on the seismic performance of simple bridges and single‐story braced frames.…”

Section: Introductionmentioning

confidence: 99%

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Effect of hysteretic properties of SMAs on seismic behavior of self-centering concentrically braced frames

Hou

Qiu

et al. 2017

Struct Control Health Monit

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Summary Shape memory alloys (SMAs) exhibit nearly ideal superelastic properties when the ambient temperature is above the austenite finish temperature, which enables them to recover deformation and dissipate energy for the seismic‐resisting structures. This unique hysteretic properties of SMAs indicate they are very promising in developing self‐centering structures. As such, recent studies installed SMAs in concentrically braced frames (CBFs) to form SMA‐based self‐centering CBFs (SCCBFs) and illustrated that the structures performed excellently with controlled peak drift and eliminated residual drift upon earthquakes. SMAs show variability in the hysteretic parameters due to the difference in metal types, crystallographic structure, component ratios, and heating treatments in producing process. Thus, this necessitates an investigation into the associated effect on the seismic performance of SMA‐based SCCBFs. To this end, this study selects 3 SMAs, proposes a bracing form, and installs SMA braces in the CBFs. Prior to the seismic analysis, all 3 frames are designed by an ad hoc design method. The focus of this paper is to understand the effect of hysteretic properties on the seismic behavior of SMA‐based SCCBFs. Intensive nonlinear time history analyses are carried out to assess the seismic performance of these structures under frequently occurred earthquakes and design basis earthquakes. The analytical results indicate the properly designed SCCBFs are able to meet prescribed performance targets and display comparable seismic demands, irrespective of the SMA types. This study suggests that using SMAs with greater hysteretic parameters is more favorable, from the perspective of saving material consumption and controlling acceleration demands.

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Seismic protection by rocking with superelastic tendon restraint

Tsang

Lam

2022

Earthq Engng Struct Dyn

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This article introduces an innovative system for enhancing the seismic performance of a structure through facilitating large rotational (rocking) motion to occur without risking overturning. The innovation of this study is in the use of tendons consisting of Nickel‐Titanium (superelastic) alloy connected in series with steel to impose partial restraints to the structure when experiencing rocking motion. Importantly, the large rotational motion is fully recoverable. Existing installations which can be made to rock may also be retrofitted with the device for improving its seismic resistance. The original contributions of the article are the derivation, and experimental validation, of an analytical model for simulating the seismic performance of a system that has been fitted with the restraining device. In a parametric study employing the newly developed modelling techniques, major trends in the seismic response behaviour of the structure have been identified.

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Characterization of cyclic properties of superelastic monocrystalline Cu–Al–Be SMA wires for seismic applications

Cited by 79 publications

References 37 publications

Shake table test and numerical study of self‐centering steel frame with SMA braces

Shake table test and numerical study of self‐centering steel frame with SMA braces

Effect of hysteretic properties of SMAs on seismic behavior of self-centering concentrically braced frames

Seismic protection by rocking with superelastic tendon restraint

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