Title: Seismic response control of modal building using shape memory alloy tension sling damper

Authors: Sujata H. Mehta; Sharadkumar P. Purohit

Addresses: Civil Engineering Department, School of Engineering, Institute of Technology, Nirma University, Ahmedabad, Gujarat, 382481, India ' Civil Engineering Department, School of Engineering, Institute of Technology, Nirma University, Ahmedabad, Gujarat, 382481, India

Abstract: Unprestrained NiTinol shape memory alloy wire-based tension sling damper, SMA-TSD, is developed to produce passive damper force at ground story of a three-story modal building. Nonlinear hysteretic behaviour of superelastic SMA is represented by one-dimensional Tanaka model. SMA-TSD is characterised by linear Voigt model with equivalent stiffness and equivalent viscous damping components under seismic excitations to implement it with linear modal building. Equivalent viscous damping ratio is evaluated by proposed instantaneous damping approach more appropriately simulating practical scenario as well as constant damping approach used in other studies. Uncontrolled and controlled responses of modal building are obtained to prove efficacy of superelastic passive SMA-TSD. Seismic performance indices are found to reduce substantially for controlled modal building when design parameters of passive superelastic SMA-TSD are adjusted.

Keywords: tension sling damper; superelastic SMA; Tanaka model; modal building; performance indices.

DOI: 10.1504/IJSTRUCTE.2022.10046146

International Journal of Structural Engineering, 2022 Vol.12 No.3, pp.240 - 263

Published online: 01 Jul 2022 *

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