Application of shape memory alloy dampers in the seismic control of cable-stayed bridges

2009 ◽  
Vol 31 (2) ◽  
pp. 607-616 ◽  
Author(s):  
Alaa M. Sharabash ◽  
Bassem O. Andrawes
Keyword(s):  
Shape Memory Alloy ◽  
Shape Memory ◽  
Seismic Control ◽  
Cable Stayed Bridges

Passive Seismic Control Using Shape Memory Alloy Springs

2006 ◽  
Author(s):  
Yoshitaka Yamashita ◽  
Arata Masuda ◽  
Akira Sone
Keyword(s):  
Shape Memory Alloy ◽  
Shape Memory ◽  
Shaking Table ◽  
Scale Model ◽  
Response Analysis ◽  
Acceleration Response ◽  
Restoring Force ◽  
Seismic Control ◽  
Seismic Force ◽  
Sma Spring

In this paper, seismic response analysis is made both experimentally and numerically for a passive isolation device with pseudoelastic shape memory alloy (SMA) spring as a restoring force component. Thanks to the material nonliniarity and the geometrical nonliniarity, the SMA spring used in the device has well-defined softening, or “force limiting”, property that can suppress the acceleration response of the superstructure by limiting the seismic force transmitted from the ground. To illustrate how the presented device can suppress the acceleration response under the prescribed level, shaking table tests of a reduced-scale model of uniaxial isolator are carried out with seismic inputs appropriately scaled both in time and in amplitude. Then, a Preisach model of the SMA spring is constructed for the purpose of design study, and verified by comparing the simulated seismic responses with the experimental ones.

Design of SMA Damper and Analysis on Seismic Control of Frame Structure

2012 ◽  
Vol 204-208 ◽  
pp. 2584-2589
Author(s):  
De Jin Xing ◽  
Bao Quan Yang ◽  
Ming Dong Wang
Keyword(s):  
Energy Dissipation ◽  
Shape Memory Alloy ◽  
Shape Memory ◽  
Seismic Response ◽  
Simulation Analysis ◽  
Frame Structure ◽  
Seismic Control ◽  
Energy Dissipation Ratio

With the SMA (Shape Memory Alloy) banner model, the effect of pre-stressing and displacement, stiffness and length to the energy dissipation ratio is studied. The two equations, which are of pre-stressing and displacement to the energy dissipation ratio are proposed. The method are put forward to confirm the stiffness and length of SMA . Based on the above analysis, a new pull-press SMA damper is designed. The simulation analysis on seismic response of five-floor frame with SMA damper shows that the displacement and acceleration of the top floor are reduced by 50﹪at least. It verifies that this kind of SMA damper can availably suppress the seismic response of structure.

scholarly journals A Novel Actuator System Combining Mechanical Vibration and Magnetic Wheels Capable of Rotational Motion Using Shape Memory Alloy Coils

Actuators ◽  
2019 ◽  
Vol 8 (1) ◽  
pp. 4 ◽  
Author(s):  
Hiroyuki Yaguchi ◽  
Izuru Kimura ◽  
Shun Sakuma
Keyword(s):  
Shape Memory Alloy ◽  
Shape Memory ◽  
Reaction Force ◽  
Mechanical Vibration ◽  
Turning Operations ◽  
Electromagnetic Vibration ◽  
Actuator System ◽  
Strong Winds ◽  
Inspection Techniques ◽  
Cable Stayed Bridges

In every country, large steel bridges, such as cable-stayed bridges, are actively being constructed, and the number of such bridges has been progressively increasing. These bridges are often inspected using drones, but inspection techniques have not been established because of strong winds and thunder. Therefore, robots capable of working in difficult environments are desired. In the present study, a prototype of a rotary actuator system combining two iron disks and two electromagnetic-vibration-type actuators was fabricated. A new operation principle was developed that drives the system using the reaction force of the vibration-type actuator. Two shape memory alloy coils and two friction pads were integrated into the system to enable it to carry out turning operations, which were successfully demonstrated. The proposed actuator system can thus move in any direction. In addition, with this actuator system, both slide-on-ceiling and wall-climbing motions are possible.

Shape memory alloy-spring damper for seismic control and its application to bridge with laminated rubber bearings

2021 ◽  
pp. 136943322110339
Author(s):  
Sasa Cao ◽  
Jiang Yi
Keyword(s):  
Shape Memory Alloy ◽  
Shape Memory ◽  
Large Deformation ◽  
Design Procedure ◽  
Hysteretic Behavior ◽  
Small Displacement ◽  
Seismic Excitations ◽  
Seismic Control ◽  
Sma Spring ◽  
Rubber Bearings

This study introduces a shape memory alloy (SMA)-spring damper which is composed of SMA bars and elastic springs arranged in perpendicular. The damper depicts a curved flag-shape hysteretic behavior that is endowed with self-centering capacities and large deformation capabilities but uses reduced amount of SMA material. A design procedure is proposed to apply the SMA-spring damper to the bridge with laminated rubber bearings which would slide under seismic excitations. Analytical results validate the effectiveness of SMA-spring dampers in seismic control of the bridge: (1) The damper provides trivial stiffness to the bridge at small displacement, and the isolation efficiency of the bridge is maintained; (2) large horizontal force is provided for the structures at large deformation of the bearings, which alleviates the excessive displacement of bearings and prevents span collapse; and (3) the damper helps recenter the bearings and reduce the residual displacement of the bridge.

Structure and mobility of martensite variant interfaces in a Cu-Zn-AI shape memory alloy

2003 ◽  
Vol 112 ◽  
pp. 519-522 ◽  
Author(s):  
W. Cai ◽  
J. X. Zhang ◽  
Y. F. Zheng ◽  
L. C. Zhao
Keyword(s):  
Shape Memory Alloy ◽  
Shape Memory ◽  
Martensite Variant

Compression Experiment and Simulation Study of Shape Memory Alloy Lattice Structure

2019 ◽  
Author(s):  
Osuke Ishida ◽  
Junichi Kitada ◽  
Katsuhiko Nunoani ◽  
Kiyoshi Uzawa
Keyword(s):  
Shape Memory Alloy ◽  
Shape Memory ◽  
Simulation Study ◽  
Lattice Structure ◽  
Experiment And Simulation
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