Fatigue tests on SMA bars in span control

Casciati, Sara; Marzi, Alessandro

doi:10.1016/j.engstruct.2010.12.045

Cited by 29 publications

(25 citation statements)

References 16 publications

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“…It shows that the main factor controlling the loading cycle number was strain amplitude Δε , and the test results showed no decrement of fatigue life as initial strain increases. The results are actually very similar to test results reported by Casciati and Marzi and Pelton et al…”

Section: Fatigue Test Of Pre‐tensioned Sma Wiresupporting

confidence: 91%

“…Although there are many related studies of the fatigue of SMAs, only a few targeted for engineering structure vibration mitigation with a prestrained SMA. Casciati and Marzi carried out a test on a Cu‐based SMA in span control, and the parameters that influence the fatigue lifetime of the alloy was identified. Carreras et al further applied the above alloy in portico‐braces by fatigue laboratory tests.…”

Section: Introductionmentioning

confidence: 99%

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Damping and frequency of a model cable attached with a pre-tensioned shape memory alloy wire: Experiment and analysis

Zhou

Yao

et al. 2017

Struct Control Health Monit

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Summary This study proposed a system consisting of a stay cable transversely attached with a pre‐tensioned shape memory alloy (SMA) wire. Cyclic tension loading test of pre‐tensioned 0.5‐mm‐diameter NiTi wire was conducted first. The effective modulus and energy dissipation per unit volume were obtained from the tested hysteretic loops of the pre‐tensioned SMA wire. The effects of prestrain on the energy dissipation and effective modulus of the SMA wire was discussed. Preliminary fatigue testing of 0.5‐mm‐ and 1.0‐mm‐diameter SMA wires was carried out, and a vibration mitigation experiment with a model stay cable transversely attached with a pre‐tensioned SMA wire was then conducted. Both the first and the second in‐plane mode vibrations were tested. The effects of the SMA wire installation location and pre‐tension level on the frequency and damping ratio of the model‐cable‐SMA‐wire system were discussed. The test results confirmed there was an optimal pre‐tension level of the SMA wire for maximum mode damping, and in this test, the maximum damping ratio was larger than 0.50%. A preliminary linearized theoretical study was also carried out to further explore the dynamics of the model‐cable‐SMA‐wire system. The comparison results showed good agreement of theoretical frequency and damping to the tested version. The study confirmed the potential application of pre‐tensioned SMA wires as cross‐ties for stay cable vibration mitigation.

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Section: Fatigue Test Of Pre‐tensioned Sma Wiresupporting

confidence: 91%

Section: Introductionmentioning

confidence: 99%

Damping and frequency of a model cable attached with a pre-tensioned shape memory alloy wire: Experiment and analysis

Zhou

Yao

et al. 2017

Struct Control Health Monit

View full text Add to dashboard Cite

show abstract

“…Furthermore, both the test results and the numerical approximations reiterate the robustness and the effectiveness of the proposed brace frame system in terms of providing recentering capability to the frame system and reducing PRA within the base shear capacity, at loading frequencies up to 6 Hz. It should be noted that fatigue characteristics and deterioration of hysteresis loops of SEAs in subsequent loading cycles are one of the major topics that need to be addressed for practical application of the proposed tension brace system as reported by recent studies . Such fatigue properties of Cu–Al–Mn SEAs will be addressed in the authors' future works.…”

Section: Resultsmentioning

confidence: 86%

Feasibility of tension braces using Cu-Al-Mn superelastic alloy bars

Araki

Maekawa

Shrestha

et al. 2014

Struct. Control Health Monit.

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SUMMARY This paper investigates the feasibility of tension braces using Cu–Al–Mn superelastic alloy bars as energy dissipating and self‐centering elements for steel frames by performing 1/3 scale shaking table tests. The difficulty with conventional steel tension braces lies in pinching or significant deterioration of stiffness and strength under cyclic loading. When a steel frame with conventional tension braces is subjected to intense earthquakes, pinching may lead to a large residual drift and/or instability. To overcome the difficulty, this paper examines the effectiveness of Cu–Al–Mn superelastic alloy bars, facilitated by their large recovery strain, low material cost, and high machinability, as a partial replacement of steel bars in tension braces. In the shaking table tests, a 1/3 scaled 1‐bay, 1‐story steel frame with the present tension braces is subjected to quasi‐static cyclic loading and dynamic harmonic ground motions of 6 Hz. Both the static and dynamic test results demonstrate the effectiveness of the present braces in avoiding pinching under the ductility ratio up to 3. The dynamic test results also demonstrate the capability of the present tension braces in reducing the peak response acceleration within the base shear capacity. To study the rate dependence of the frame response, further, time‐history analyses are performed by using a SDOF model based on a uniaxial rate‐independent model, calibrated with the quasi‐static tests. A comparison of the analytical results with the dynamic test results demonstrates that the rate dependence of the frame response is negligible up to the loading frequency of 6 Hz. Copyright © 2014 John Wiley & Sons, Ltd.

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“…Regarding the limited damping provided by passive dampers (due to limited installation length of damper), investigations were underway by means of cross‐ties and semiactive dampers . Smart materials, such as magnetorheological damper, have the potential for further wide applications; and studies are still needed to improve the fatigue life of shape memory alloy cross‐ties for possible applications.…”

Section: Introductionmentioning

confidence: 99%

Free vibration of a taut cable with a damper and a concentrated mass

Zhou

Huang

Xiang

et al. 2018

Struct Control Health Monit

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Summary Recent numerical studies showed the combined effects of mass and viscous damper would behave like that of semiactive damper with “negative stiffness properties.” This paper analytically studied the characteristic equation of the cable‐mass‐damper system derived with help of the transfer matrix method. After the expansion of the complex frequency equation in terms of real and imaginary parts, the special limiting solutions are obtained, together with three different classified mode behaviors. Asymptotic approximate formulations for damper and concentrated mass close to the cable end are developed provided that both the nondimensional mass coefficient and the frequency shift between the free and damped cable system are small. The influences of the nondimensional mass coefficient and its location on the maximum cable vibration damping and the corresponding optimal damper constant are also studied as the damper is installed near the cable anchorage and the mass is moved along the cable axis. When the damper and concentrated mass are located at the same position, the mode behaviors are investigated in three regimes by means of varying the nondimensional mass coefficient. The general solutions for the arbitrary location of damper and concentrated mass along the cable axis are further discussed. It is found that the concentrated mass will significantly affect the system damping, especially when the concentrated mass and the damper are located at the same half wave of the mode shape.

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Fatigue tests on SMA bars in span control

Cited by 29 publications

References 16 publications

Damping and frequency of a model cable attached with a pre-tensioned shape memory alloy wire: Experiment and analysis

Damping and frequency of a model cable attached with a pre-tensioned shape memory alloy wire: Experiment and analysis

Feasibility of tension braces using Cu-Al-Mn superelastic alloy bars

Free vibration of a taut cable with a damper and a concentrated mass

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