On the use of Shape Memory Alloys dampers to reduce the vibration amplitudes of civil engineering cables

2011 ◽  
pp. 221-234 ◽  
Author(s):  
L. Dieng ◽  
V. Torra ◽  
P. Pilvin
Keyword(s):  
Shape Memory Alloys ◽  
Shape Memory ◽  
Civil Engineering

Iron-based shape memory alloys for civil engineering structures: An overview

2014 ◽  
Vol 63 ◽  
pp. 281-293 ◽  
Author(s):  
A. Cladera ◽  
B. Weber ◽  
C. Leinenbach ◽  
C. Czaderski ◽  
M. Shahverdi ◽  
...  
Keyword(s):  
Shape Memory Alloys ◽  
Shape Memory ◽  
Civil Engineering ◽  
Engineering Structures ◽  
Iron Based ◽  
Civil Engineering Structures

Theoretical and Experimental Studies for the Application of Shape Memory Alloys in Civil Engineering

2006 ◽  
Vol 128 (3) ◽  
pp. 302-311 ◽  
Author(s):  
Mauro Dolce ◽  
Donatello Cardone
Keyword(s):  
Shape Memory Alloys ◽  
Shape Memory ◽  
Seismic Isolation ◽  
Civil Engineering ◽  
Experimental Studies ◽  
Hysteresis Loops ◽  
Strong Reduction ◽  
Framed Structures ◽  
Good Energy ◽  
Experimental And Theoretical Studies

Shape memory alloys (SMAs) have great potential for use in the field of civil engineering. The authors of this paper have been involved, from 1996, in several experimental and theoretical studies of the application of SMAs in civil engineering, for national and international research projects. This paper provides an overview of the main results achieved, consisting of the conceptual design, implementation, and testing of three families of SMA-based devices, namely: (i) special braces for framed structures, (ii) seismic isolation devices for buildings and bridges, and (iii) smart ties for arches and vaults. The main advantage of using SMA-based devices in the seismic protection of structures comes from the double-flag shape of their hysteresis loops, which implies three favorable features, i.e., self-centering capability, good energy dissipation capability, and high stiffness at small displacements. The main advantage of smart ties comes from the thermal behavior of SMA superelastic wires, which is opposite to that of steel rod. This implies a strong reduction of the force changes caused by variations of air temperature.

scholarly journals SMA in Mitigation of Extreme Loads in Civil Engineering: Damping Actions in Stayed Cables

2011 ◽  
Vol 82 ◽  
pp. 539-544 ◽  
Author(s):  
Vicenç Torra ◽  
Antonio Isalgue ◽  
Carlota Auguet ◽  
Guillem Carreras ◽  
Francisco C. Lovey ◽  
...  
Keyword(s):  
Shape Memory Alloys ◽  
Shape Memory ◽  
Civil Engineering ◽  
Oscillation Amplitude ◽  
Strong Wind ◽  
Extreme Loads ◽  
Extreme Load ◽  
Load Effects

Reliable use of Shape Memory Alloys (SMA) in mitigation of extreme load effects requires a deep study of the SMA behavior according to the necessities of the application. Damping the oscillations induced by one storm of three or four days with a strong wind and/or rain usually requires more than one million of working cycles. A SMA damper is checked in to two realistic cables of ELSA and of IFSTTAR. The measurements establish that the SMA damping device reduces drastically the oscillation amplitude. Technical suggestions for the preparation of the dampers built by several SMA wires of NiTi with 2.46 mm of diameter are included. The choice of appropriate length and the choice of the number of required SMA wires are suggested. Moreover, a suitable simulation by proprietary SMA routine inside ANSYS is included.

scholarly journals SMA in Mitigation of Extreme Loads in Civil Engineering: Study of their Application in a Realistic Steel Portico

2011 ◽  
Vol 82 ◽  
pp. 278-283 ◽  
Author(s):  
Vicenç Torra ◽  
Antonio Isalgue ◽  
Carlota Auguet ◽  
Guillem Carreras ◽  
Fabio Casciati ◽  
...  
Keyword(s):  
Shape Memory Alloys ◽  
Shape Memory ◽  
Civil Engineering ◽  
Oscillation Amplitude ◽  
Extreme Loads ◽  
Extreme Load ◽  
Engineering Study ◽  
Load Effects

Guaranteeing the use of Shape Memory Alloys (SMA) in mitigation of extreme load effects requires a deep study of the SMA behavior according to the specific requirements of the applications in damping. The damper was defined according the expected requirements (length of SMA and number of SMA wires). It is applied to two types of alloys (CuAlBe and NiTi) in the diagonals of a realistic steel portico (2.47 m x 4.10 m). The measurements establish that the used SMA reduces the oscillation amplitude to a less than a half.

Technical Analysis of Smart Material Structures and their Applications in Civil Engineering

2018 ◽  
Vol 2 (01) ◽  
Author(s):  
Vineet Kumar Pandey ◽  
C. K. Singh
Keyword(s):  
Shape Memory Alloys ◽  
Shape Memory ◽  
Elastic Properties ◽  
Crystalline Structure ◽  
Smart Materials ◽  
Civil Engineering ◽  
Living Organism ◽  
Smart Material ◽  
Continuous Development ◽  
Innovative Materials

Due to the continuous development in the field of innovative materials, the smart material and structures can be used as a new tool in architectural industry. A conventional architectural structure is designed to function under pre-assumed forces and loads (pressure) and thus it can’t develop itself an ability to control unexpected forces and loads. The designs using smart materials are inspired with nature to mimic human i.e. a material with capability of sensing and responding with the change in environment .The aim of research in the field of smart material structures is to make a system to mimic living organism with actuators and sensors. These materials have numerous applications in the field of civil engineering e.g. SMA (shape memory alloys) with super elastic properties (inspired with the concept of elasticity),can provide a control over the shape of the structure with changing crystalline structure via a change in temperature.

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