Pilot Study for Investigating the Cyclic Behavior of Slit Damper Systems with Recentering Shape Memory Alloy (SMA) Bending Bars Used for Seismic Restrainers

Superelastic shape memory alloy materials have become increasingly prevalent for recentering devices that have the ability to recover their plastic deformation automatically. For this reason, this study proposed new clip-angle connections incorporating superelastic shape memory alloy bolts. Including component spring models, mechanical joint models of steel bolted connections and shape memory alloy bolted connections are created for numerically simulating their cyclic behavior. The numerical analysis results are then compared to each other in terms of ultimate strength, energy dissipation, and permanent deformation. In particular, over 60% of the total displacement was recovered during unloads in case of shape memory alloy bolted connections, indicating that the proposed smart connections display obvious recentering features in their behaviors.

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Cyclic behavior of an adaptive seismic isolation system combining a double friction pendulum bearing and shape memory alloy cables

Smart Materials and Structures ◽

10.1088/1361-665x/abfb80 ◽

2021 ◽

Author(s):

Peng Zhuang ◽

Wei Wang ◽

Yibo Li ◽

Miao Han

Keyword(s):

Shape Memory Alloy ◽

Shape Memory ◽

Seismic Isolation ◽

Cyclic Behavior ◽

Isolation System ◽

Friction Pendulum

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Cyclic Behavior of Masonry Shear Walls Retrofitted with Engineered Cementitious Composite and Pseudoelastic Shape Memory Alloy

Sensors ◽

10.3390/s22020511 ◽

2022 ◽

Vol 22 (2) ◽

pp. 511

Author(s):

Alireza Tabrizikahou ◽

Mieczysław Kuczma ◽

Magdalena Łasecka-Plura ◽

Ehsan Noroozinejad Noroozinejad Farsangi

Keyword(s):

Shape Memory Alloy ◽

Shape Memory ◽

Shear Walls ◽

Absorption Capacity ◽

Cyclic Behavior ◽

Masonry Walls ◽

Cementitious Composite ◽

Energy Absorption Capacity ◽

Engineered Cementitious Composite ◽

Mesh Density

The behavior of masonry shear walls reinforced with pseudoelastic Ni–Ti shape memory alloy (SMA) strips and engineered cementitious composite (ECC) sheets is the main focus of this paper. The walls were subjected to quasi-static cyclic in-plane loads and evaluated by using Abaqus. Eight cases of strengthening of masonry walls were investigated. Three masonry walls were strengthened with different thicknesses of ECC sheets using epoxy as adhesion, three walls were reinforced with different thicknesses of Ni–Ti strips in a cross form bonded to both the surfaces of the wall, and one was utilized as a reference wall without any reinforcing element. The final concept was a hybrid of strengthening methods in which the Ni–Ti strips were embedded in ECC sheets. The effect of mesh density on analytical outcomes is also discussed. A parameterized analysis was conducted to examine the influence of various variables such as the thickness of the Ni–Ti strips and that of ECC sheets. The results show that using the ECC sheet in combination with pseudoelastic Ni–Ti SMA strips enhances the energy absorption capacity and stiffness of masonry walls, demonstrating its efficacy as a reinforcing method.

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