Seismic Assessment of Concentrically Braced Steel Frames with Shape Memory Alloy Braces

McCormick, Jason; DesRoches, Reginald; Fugazza, Davide; Auricchio, Ferdinando

doi:10.1061/(asce)0733-9445(2007)133:6(862)

Cited by 134 publications

(71 citation statements)

References 22 publications

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“…As wire is one of the most convenient forms of SMA due to its ease of manufacture and high utilisation efficiency, significant research efforts have been devoted to the application of SMA wires in base isolators [5][6], dampers [7][8], and bracing systems [9][10][11]. While good self-centring abilities coupled with reasonable energy dissipation were generally observed in these devices or structural components, a large number of wires need to be included to ensure that the levels of load resisting capacity match the magnitude required for accommodating 'structural-level'…”

Section: Introductionmentioning

confidence: 99%

Superelastic SMA Belleville washers for seismic resisting applications: experimental study and modelling strategy

Fang

Zhou

Osofero

et al. 2016

Smart Mater. Struct.

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This study sheds considerable light on the potential of superelastic Shape Memory Alloy (SMA) Belleville washers for innovative seismic resisting applications. A series of experimental studies were conducted on washers with different stack combinations under varying temperatures and loading scenarios. The washers showed satisfactory self-centring and energy dissipation capacities at room temperature, although slight degradations of the hysteretic responses accompanied by residual deformations were induced. The hysteretic loops became stable after a few number of cycles, indicating good repeatability. The washers also showed good flexibility in terms of load resistance and deformation, which could be easily varied via changes in the stack combination. Compromised selfcentring responses were observed at temperatures below 0 °C or above 40 °C, and a numerical study, validated by the experimental results, was adopted to further investigate the deformation mechanism of the washers. A further phenomenological model, taking account of the degradation effects under varied temperatures, was developed to enable effective and accurate simulation of devices incorporating the washers. Good agreements were observed between the test and simulation results, and the model was shown to have good numerical robustness for wide engineering applications.

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Section: Introductionmentioning

confidence: 99%

Superelastic SMA Belleville washers for seismic resisting applications: experimental study and modelling strategy

Fang

Zhou

Osofero

et al. 2016

Smart Mater. Struct.

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“…As seen in Figure 8, the simulated stress and strain curve for the superelastic SMA was calibrated to the experimental test result. The required input parameters such as elastic modulus (40 GPa), Poisson's ratio (0.33), martensite start stress (440 MPa), martensite finish stress (540 MPa), austenite start stress (250 MPa), austenite finish stress (140 MPa), and transformation strain (0.042), phase transformation temperature (22˝C)) were acquired from uniaxial pull-out tests conducted by DesRoches et al [19], and used for this numerical simulation. …”

Section: Analytical Modeling and Testsmentioning

confidence: 99%

“…Owing to the characteristics of the replaceable structural fuse, the damper devices assembled to the base isolation system are encouraged to possess both energy dissipation capacity attributed to large hysteretic loop area and recentering capability attributed to small permanent deformation. Superelastic shape memory alloys (SMAs) that satisfy these requirement conditions have been recently receiving more attention to their application to the damper systems [17][18][19][20]. Figure 2 shows the typical stress-strain curve for superelastic SMA materials.…”

Section: Introductionmentioning

confidence: 99%

“…The most commonly used SMAs referred to as Nitinol (nickeltitanium) alloys are composed of 56% nickel by weight and 44% titanium [21]. Above the austenite finishing temperature (Af), SMA materials exhibit superelasticity which goes back to their original configuration upon unloading without any heat treatment [19][20][21]. The flag-shaped hysteresis loop with a stress plateau is able to dissipate a considerable amount of energy during cyclic loads, meaning that it takes advantage of absorbing vibrations.…”

Section: Introductionmentioning

confidence: 99%

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Seismic Response and Performance Evaluation of Self-Centering LRB Isolators Installed on the CBF Building under NF Ground Motions

Seo

2016

Sustainability

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This paper mainly treats the seismic behavior of lead-rubber bearing (LRB) isolation systems with superealstic shape memory alloy (SMA) bending bars functioning as damper and self-centering devices. The conventional LRB isolators that are usually installed at the column bases supply extra flexibility to the centrically braced frame (CBF) building with a view to elongate its vibration period, and thus make a contribution to mitigating seismic acceleration transferred from ground to structure. However, these base isolation systems are somehow susceptible to shear failure due to the lack of lateral resistance. In the construction site, they have been used to be integrated with displacement control dampers additionally withstanding lateral seismic forces. For this motivation, LRB isolation systems equipped with superelastic SMA bending bars, which possess not only excellent energy dissipation but also outstanding recentering capability, are proposed in this study. These reinforced and recentering LRB base isolators are modeled as nonlinear component springs, and then assigned into the bases of 2D frame models used for numerical simulation. Their seismic performance and capacity in the base-isolated frame building can be evaluated through nonlinear dynamic analyses conducted with historic ground motion data. After comparative study with analyses results, it is clearly shown that 2D frame models with proposed LRB isolators generally have smaller maximum displacements than those with conventional LRB isolators. Furthermore, the LRB isolation systems with superelastic SMA bending bars effectively reduce residual displacement as compared to those with steel bending bars because they provide more flexibility and recentering force to the entire building structure.

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“…A smart isolator combined by a laminated rubber bearing with a SMA device was proposed for bridge protection Wilde et al [3]. Novel SMA-based devices were also present by Li et al [4], Zhu and Zhang [5,6], Song et al [7], McCormick et al [8], etc., on which experiments, numerical models and applications were investigated but most of them were still in laboratory stage.…”

Section: Introductionmentioning

confidence: 99%

Dynamic Numerical Simulation of Steel Frame-Typed Piers Installed With Sma Damping Devices Based on Multi-Linear One Dimensional Constitutive Model

Luo

Usami

2010

Volume 6 Number 2

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ABSTRACT:In this paper, the effectiveness of seismic performance upgrading is studied by adoption of damping devices made of shape memory alloys (SMAs). An axial-type SMA damper is constructed and modeled on the basis of a modified multi-linear one dimensional constitutive model of SMAs. Time history analyses are carried out on typical steel frames with SMA damping devices. Performance parameters for seismic performance upgrading are investigated in consideration of four influence factors, i.e., strength ratio, martensite fraction, length ratio, and ground motion. Dynamic analyses of bare frames and frames with equivalent BRB dampers are also conducted for comparisons. Numerical investigations show that excellent re-centering ability and energy dissipation can be afforded by installing SMA damping devices in structures.

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Seismic Assessment of Concentrically Braced Steel Frames with Shape Memory Alloy Braces

Cited by 134 publications

References 22 publications

Superelastic SMA Belleville washers for seismic resisting applications: experimental study and modelling strategy

Superelastic SMA Belleville washers for seismic resisting applications: experimental study and modelling strategy

Seismic Response and Performance Evaluation of Self-Centering LRB Isolators Installed on the CBF Building under NF Ground Motions

Dynamic Numerical Simulation of Steel Frame-Typed Piers Installed With Sma Damping Devices Based on Multi-Linear One Dimensional Constitutive Model

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