Built in dampers for family homes via SMA: An ANSYS computation scheme based on mesoscopic and microscopic experimental analyses

Torra, Vicenç; Isalgué, A.; Martorell, F.; Terriault, Patrick; Lovey, F.C.

doi:10.1016/j.engstruct.2006.08.028

Cited by 60 publications

(46 citation statements)

References 22 publications

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“…A model of some bilinear elements in parallel can represent very accurately the behaviour of the SMA wire (see fig. 9 of [4]), but a first approach can be performed in much less time with the bilinear model. Also, in the OPENSEES (Open System for Earthquake Engineering Simulation, see http://opensees.berkeley.edu) code, the bilinear model can be implemented easily by the superposition of some elastic-plastic models as that of STEEL01, by choosing appropriately the parameters to approach the SMA pseudo-elastic cycle, and setting the accumulative damage to zero.…”

Section: Simulation Of the Sma Characteristicsmentioning

confidence: 99%

“…Also, for a first approach, we use a bilinear model of the stress-strain behaviour. This has been developed previously in the routine frame of USERMAT in the ANSYS code [4]. A model of some bilinear elements in parallel can represent very accurately the behaviour of the SMA wire (see fig.…”

Section: Simulation Of the Sma Characteristicsmentioning

confidence: 99%

“…If there were a short waiting time before the event, prestressing could be applied, as is done usually in some medical devices or in satellite launching. As an earthquake lasts only around a hundred seconds of large input, and the implied normal frequencies of structures are in the range of one Hertz, the needed fatigue life is less than a thousand cycles, including the major replicas For these conditions, it was found that CuAlBe was a suitable alloy [4].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Choice of SMAs for damping applications in Civil Engineering: simulations and realistic experiments

Isalgué¹,

Torra²,

Lovey

et al. 2009

ESOMAT 2009 - 8th European Symposium on Martensitic Transformations

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Abstract. There have been published many papers and several reviews on the application of SMA's as damping devices in civil engineering by using the pseudo-elastic effect, but they are difficult to apply because the behaviour of the alloys is not carefully analyzed. In particular, the summer-winter temperature effects, aging long time at low temperature, self-heating or residual strains requirements for the given applications are rarely well established. In this work, we analyze and compare two cases, the damping of earthquake effects on relatively small structures as family homes, and the damping of stayed cables in large bridges. The requirements for the materials are different, and in each case a different commercial alloy with appropriate conditioning might provide acceptable answers. To confirm the usefulness of the dampers, the hysteretic behaviour of two SMAs (CuAlBe and NiTi) has been analyzed, and later modelled and introduced in finite element codes for the simulation of structures. The behaviour of the structures without and with dampers have been analyzed and compared. Also, some realistic experiments with cable 1 in the ELSA Joint Research Centre of the EU in Ispra have been done with NiTi wire of 2.46 mm diameter as damper, to compare with simulations.

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Section: Simulation Of the Sma Characteristicsmentioning

confidence: 99%

Section: Simulation Of the Sma Characteristicsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Choice of SMAs for damping applications in Civil Engineering: simulations and realistic experiments

Isalgué¹,

Torra²,

Lovey

et al. 2009

ESOMAT 2009 - 8th European Symposium on Martensitic Transformations

Self Cite

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“…The properties of Shape Memory Alloys in pseudoelastic state give high mechanical damping, and NiTi wires have been proposed as dampers in civil engineering [3][4][5][6]. For this kind of SMA applications, high reliability is needed [7].…”

Section: Introductionmentioning

confidence: 99%

“…We should then address also the problem of functional fatigue in SMA, as failure to perform the expected work or describe the expected stress-strain-temperature designed trajectories after a number of cycles [16]. The functional fatigue is very important in applications of SMA such as dampers with re-centring properties [3]. Functional fatigue can be also important when working with high stresses [18][19].…”

Section: Introductionmentioning

confidence: 99%

Functional fatigue recovery of superelastic cycled NiTi wires based on near 100 °C aging treatments

Isalgué

Soul

Yawny

et al. 2015

MATEC Web of Conferences

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Abstract. Functional fatigue affecting superelastic behaviour of NiTi wires includes an accumulation of residual strain and an uneven decrement of transformation stress on cycling. Although this evolution is observed to diminish asymptotically, it represents an important loss in the maximum recoverable strain level and in the hysteretic dissipative capacity of the material. In this work, the effect of moderate temperature aging treatment on the functionally degraded material properties was studied with two experimental setups. NiTi pseudoelastic wire samples of 0.5 and 2.46 mm diameter were subjected to different cycling programs intercalated by aging treatments of different durations up to 48 h at 100ºC. Results show that important levels of recovery on the residual strains and the transformation stresses were attained after the aging treatments. The analysis indicates that the characteristics of the recovered cycles are rather independent from the treatment duration and from the reached condition before each treatment.

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Application of an SMA‐based hybrid control device to 20‐story nonlinear benchmark building

Ozbulut

Hurlebaus

2012

Earthq Engng Struct Dyn

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SUMMARY This paper investigates the seismic response control of a 20‐story nonlinear benchmark building with a new recentering variable friction device (RVFD). The RVFD combines energy dissipation capabilities of a variable friction damper (VFD) with the recentering ability of shape memory alloy (SMA) wires. The VFD that is the first subcomponent of the hybrid device consists of a friction generation unit and piezoelectric actuators. The clamping force of the VFD can be adjusted according to the current level of ground motion by adjusting the voltage level of piezoelectric actuators. SMA wires that exhibit a unique hysteretic behavior and full shape recovery after experiencing large strains is the second subcomponent of the hybrid device. Numerical simulations of a seismically excited 20‐story benchmark building are conducted to evaluate the performance of the hybrid device. A continuous hysteretic model is used to capture frictional behavior of the VFD and a neuro‐fuzzy model is employed to describe highly nonlinear behavior of the SMA components of the hybrid device. A fuzzy logic controller is developed to adjust the voltage level of VFDs for favorable performance in an RVFD hybrid application. Results show that the RVFD modulated with a fuzzy logic control strategy can effectively reduce interstory drifts and permanent deformations without increasing acceleration response of the benchmark building for most cases. Copyright © 2012 John Wiley & Sons, Ltd.

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Built in dampers for family homes via SMA: An ANSYS computation scheme based on mesoscopic and microscopic experimental analyses

Cited by 60 publications

References 22 publications

Choice of SMAs for damping applications in Civil Engineering: simulations and realistic experiments

Choice of SMAs for damping applications in Civil Engineering: simulations and realistic experiments

Functional fatigue recovery of superelastic cycled NiTi wires based on near 100 °C aging treatments

Application of an SMA‐based hybrid control device to 20‐story nonlinear benchmark building

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