Feasibility Investigation of Superelastic Effect Devices for Seismic Isolation Applications

Attanasi, Gabriele; Auricchio, Ferdinando; Fenves, Gregory L.

doi:10.1007/s11665-009-9372-3

Cited by 8 publications

(5 citation statements)

References 1 publication

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“…It can provide selfcentring properties to post tensioned steel beam-column (Fig. 10 from Chowdhury (2013)) and to seismic isolators (Attanasi et al 2008).…”

Section: Superelastic Shape Memory Alloymentioning

confidence: 99%

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Experimental investigations of a new highly ductile hold-down with adaptive stiffness for timber seismic bracing walls

Maître

Lestuzzi

Geiser

2023

Bull Earthquake Eng

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An efficient implementation of the capacity design requires high ductility combined with a low overstrength of the critical regions. Conventional timber connections do not generally offer such ideal combination, resulting in modest behaviour and relatively high overstrength factors. Inspired by the Buckling Restrained Brace a new hold-down has been developed where the timber wall directly acts as a casing. The new hold-down has been given an adaptive stiffness allowing the structure to be stiff in the wind, while becoming more flexible in the case of an earthquake. Furthermore, local crushing of the timber members is completely avoided, and the new hold-down could be replaced after an earthquake. Experimental investigations were performed on hold-down specimens. The results show ultimate displacement values vu,c of more than 30 mm in a cyclic test according to EN12512. Eleven Cross Laminated Timber shear walls, in which the new hold-down has been implemented, were tested following monotonic and static-cyclic tests procedures, with and without vertical load. A very high ductility has been achieved with almost no strength degradation, little pinching and limited overstrength.

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“…It can provide selfcentring properties to post tensioned steel beam-column (Fig. 10 from Chowdhury (2013)) and to seismic isolators (Attanasi et al 2008).…”

Section: Superelastic Shape Memory Alloymentioning

confidence: 99%

“…As dowelled timber connections, it offers a larger ductility and a superior self-centring behaviour than the conventional and shows a lower residual deformation with a better ductility (Attanasi et al 2008). Adapted in tuneable mass damper, it reduces excessive in-service vibration (Huang et al 2020).…”

Section: Superelastic Shape Memory Alloymentioning

confidence: 99%

Experimental investigations of a new highly ductile hold-down with adaptive stiffness for timber seismic bracing walls

Maître

Lestuzzi

Geiser

2023

Bull Earthquake Eng

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“…Based on the equivalent viscous damping approach, time history analyses were used to compare the behavior of a conventional LRB device to that of a superelastic SMA one. Large energy dissipation capacity of SMAs and their good recentering capability have been made them promising as isolated devices [12].…”

Section: Introductionmentioning

confidence: 99%

Crack width study for two-span RC Beams strengthened with Ni–Ti strands under cyclic loading

Azadpour¹,

Maghsoudi²

2019

Smart Mater. Struct.

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Although cracking is normal in reinforced concrete structures, caution should be exercised to prevent impairment of the proper function or durability of the structures or cause an unacceptable appearance in the structures. Consequently, crack width calculations have been especially observed in service limit states. Recently, smart materials such as shape memory alloys (SMAs) are considered in civil engineering. SMAs are a class of metallic alloys that have the unique property of being able to undergo large amounts of plastic strain while remaining elastic. The main objective of this paper is to investigate the crack pattern of continuous reinforced concrete (RC) beams strengthened by Ni-Ti strands. Experimental service crack widths were compared with theoretical values obtained from building codes provisions and formula proposed by previous literature. It was shown that superelastic strands had a significant effect on the occurrence of cracks and so the cracking moment of SMA RC beams increased. Verification of theoretical equations virtually resulted in overestimated crack widths for strengthened beams. Besides, the high recovery capacity of crack widths is the most important superiority of SMA RC beams.

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“…Further, SMA springs consisting of pseudo‐elastic SMA wires and helical SMA springs (in isolation system) have been used for the passive seismic vibration control of civil structures. Also, SMAs have been combined with rubber bearings for reducing the displacement of isolator bearings and have been supplemented with sliding isolators for developing super‐elastic friction base isolators. Finally, SMAs have demonstrated superior control efficiency in protecting highway bridges and buildings from near‐fault earthquakes .…”

Section: Introductionmentioning

confidence: 99%

Thermally modulated shape memory alloy friction pendulum (tmSMA-FP) for substantial near-fault earthquake structure protection

Gur

Frantziskonis

Mishra

2017

Struct Control Health Monit

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Summary Vibration control of structures under near‐fault earthquakes by employing a friction pendulum supplemented with thermally modulated shape memory alloy (SMA) springs as damper system is studied. Temperature modulation of the SMA spring during the earthquake effectively alters its hysteretic energy dissipation capacity and thereby the control efficiency of the isolation system. The response of a structure with the isolation system is evaluated through nonlinear dynamic time‐history analysis under a set of recorded near‐fault ground motions. Through temperature modulation that effectively yields a large SMA hysteretic energy dissipation, the hybrid friction pendulum system with SMA temperature modulation shows enormous control efficiency. A parametric study reveals that under a wide range of conditions, the thermally modulated SMA friction pendulum isolation system shows improved control efficiency over conventional friction pendulum and SMA friction pendulum isolation systems. Further, the temperature‐tuned SMA hysteresis loops substantially suppress the high frequency components of earthquake motions, thus reducing the possibility of damage to the structure.

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Feasibility Investigation of Superelastic Effect Devices for Seismic Isolation Applications

Cited by 8 publications

References 1 publication

Experimental investigations of a new highly ductile hold-down with adaptive stiffness for timber seismic bracing walls

Experimental investigations of a new highly ductile hold-down with adaptive stiffness for timber seismic bracing walls

Crack width study for two-span RC Beams strengthened with Ni–Ti strands under cyclic loading

Thermally modulated shape memory alloy friction pendulum (tmSMA-FP) for substantial near-fault earthquake structure protection

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