The IUP Journal of Structural Engineering
Passive Seismic Protection of Shear Building Using Shape Memory Alloy-Based Tension Sling Damper

Article Details
Pub. Date : Jan, 2021
Product Name : The IUP Journal of Structural Engineering
Product Type : Article
Product Code : IJSE30121
Author Name : Sujata H Mehta and Sharadkumar Purohit
Availability : YES
Subject/Domain : Science and Technology
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No. of Pages : 18

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Abstract

Passive control force is obtained from Shape Memory Alloy-based Tension Sling Damper (SMA-TSD) fitted to a seismically excited 10 storeyed shear building. One-dimensional Tanaka model is considered to represent the hysteresis behavior of SMA-TSD. This exhibits a nonlinear relationship between damper force and input states; hence, its implementation with linear system is a nontrivial task. In the paper, SMA-TSD is represented by Voigt model comprising equivalent stiffness and damping components derived by mapping it with flag-shaped hysteresis loop defined by Tanaka model. The results for controlled response of the buildings are obtained in terms of peak response quantities, i.e., interstorey drift, displacement and acceleration. One SMA-TSD fitted at ground storey of the building yields moderate control (~29%) in peak response quantities. However, peak response quantities reduce substantially (~53%) for different levels of El Centro seismic excitations and moderately (~19%) for 50% Kobe seismic excitation when two SMA-TSDs are used in the building. The efficacy of SMA-TSD implemented in the study is a function of design parameters, diameter of SMA wire and length of SMA wire, and can be optimized.


Description

Seismic response of buildings has been a matter of utmost concern in order to save lives and minimize damages amid fast paced growth of vertical cities. Some design strategies, including base isolation and supplemental damping devices, are frequently practiced in seismic-prone areas. Base isolation increases the natural period of the overall structure, which reduces its acceleration response under seismic excitation, and thus it works efficiently for stiff structures (Housner et al., 1997). For other types of structures, primary damping mechanisms are activated through passive energy dissipation devices like viscous fluid dampers, viscoelastic solid dampers, metallic dampers and friction dampers (Soong and Spencer, 2002). These devices dissipate energy resulted due to seismic excitation of the system in the form of heat due to viscous friction in viscous fluid damper, yielding of metal in metallic damper, shearing of viscoelastic material in viscoelastic damper and sliding friction between two surfaces in friction damper (Pall and Marsh, 1982; Aiken and Kelly, 1992; and Symans and Constantinou, 1998). The aim of such devices in a structure is to limit damaging deformations, but the extent to which a particular device accomplishes the aim depends on the inherent properties of the structure, properties of damping device and characteristics of seismic excitations (Symans et al., 2008).


Keywords

Shape Memory Alloy (SMA), Tension Sling Damper (TSD), Voigt model, Passive control

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