Evaluation of the performance of a sliding-type base isolation system with a NiTi shape memory alloy device considering temperature effects

Abstract Base isolation provides a very effective passive method of protecting the structure from the hazards of earthquakes. The proposed isolation system combines the laminated rubber bearing with the device made of shape memory alloy (SMA). The smart base isolation uses hysteretic behavior of SMA to increase the structural damping of the structure and utilizes the different responses of the SMA at different levels of strain to control the displacements of the base isolation system at various excitation levels. The performance of the smart base isolation is compared with the performance of isolation by laminated rubber bearings to assess the benefits of additional SMA damper for isolation of three story building.

Download Full-text

Base isolation system using shape memory alloy wires

10.1117/12.539479 ◽

2004 ◽

Cited By ~ 2

Author(s):

Yoshitaka Yamashita ◽

Arata Masuda ◽

Akira Sone

Keyword(s):

Shape Memory Alloy ◽

Shape Memory ◽

Base Isolation ◽

Isolation System ◽

Base Isolation System

Download Full-text

Seismic Evaluation of Base Isolated System Equipped with Shape Memory Alloys

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.831.110 ◽

2013 ◽

Vol 831 ◽

pp. 110-114

Author(s):

S. Alvandi ◽

M. Ghassemieh

Keyword(s):

Shape Memory Alloys ◽

Shape Memory ◽

Seismic Isolation ◽

Passive Control ◽

Structural Model ◽

Base Isolation ◽

Base Shear ◽

Seismic Evaluation ◽

Isolation System ◽

Base Isolation System

Seismic isolation system is an example of passive control system that effectively improves the performance of structures. This research discusses the seismic performance of a elastomeric base isolation system which provide the combined features of vertical load support, horizontal flexibility and energy absorbing capacity, utilizing shape memory alloys that provides re-centering force and additional damping in the system. Also this paper compares the effect of such alloys with memory effect and/or superelasticity (with pre-straining) in base isolated structure. To provide such comparison, a nonlinear structural model has been developed on some benchmark control problems and some health monitoring evaluation criterias are used. The smart base isolation utilizes the different responses of shape memory alloys at several levels of strain to control the displacements of the rubber bearing and base shear at excitation level. Furthermore the proposed based isolation systems has enhanced performance in terms of response reduction and re-centering capacity.

Download Full-text

Seismic Behavior of Superelastic Shape Memory Alloy Spring in Base Isolation System of Multi-Story Steel Frame

Materials ◽

10.3390/ma12060997 ◽

2019 ◽

Vol 12 (6) ◽

pp. 997 ◽

Cited By ~ 7

Author(s):

Yuping Liu ◽

Hongyang Wang ◽

Canxing Qiu ◽

Xingnan Zhao

Keyword(s):

Finite Element ◽

Shape Memory ◽

Earthquake Engineering ◽

Seismic Behavior ◽

Base Isolation ◽

Residual Deformation ◽

Steel Frame ◽

Isolation System ◽

Base Isolation System ◽

Sma Spring

Owing to excellent re-centering capability and good damping behavior, superelastic shape memory alloys (SMAs) are emerging as a potential new material to enhance the seismic resilience of civil structures. This paper focuses on using base isolation with SMA device for isolated structures. SMA springs are deemed to be promising candidate as the damper in the base isolation system, due to the compact form, damping contribution, restoring capability and flexible stiffness. This paper reported the concept of an innovative spring which is made of superelastic SMA wire. Then cyclic loading tests were carried out to evaluate the interested cyclic properties. Parametric analyses based on finite element simulations were conducted to reveal the versatile performance of SMA springs. To further examine its seismic behavior in the base isolation system, the SMA spring was later installed at the isolation level of a multi-story steel frame, based on the finite element model built in the earthquake engineering simulation platform OpenSees. An ordinary elastic spring is included for comparison to highlight the features of SMA springs. Both isolated frames were subjected to real earthquakes. The comparisons indicated that using SMA spring is more effective in controlling maximum and residual deformation for the protected superstructures. Thus, this paper well demonstrated the feasibility and merits of using SMA springs in the isolated frames.

Download Full-text