Parametric Numerical Study and Behavioral Modeling of a Hybrid Steel–SMA Axial Damper

Asgarian, Behrouz; Amir Ahmadi, Majid; Jalaeefar, Ali

doi:10.61882/NMCE.2401.1046

Parametric Numerical Study and Behavioral Modeling of a Hybrid Steel–SMA Axial Damper

Document Type : Research

Authors

Behrouz Asgarian ¹

Majid Amir Ahmadi ²

Ali Jalaeefar ³

¹ Professor, Department of civil engineering, K.N. Toosi University of Technology, Tehran, Iran

² MSc, Department of civil engineering, K.N. Toosi University of Technology, Tehran, Iran

³ Department of Civil Engineering, NT.C., Islamic Azad University, Tehran, Iran

10.61882/NMCE.2401.1046

Abstract

This paper addresses the major parameters affecting the behavior of hybrid dampers consisting of shape-memory alloy (SMA) and steel materials, subjected to cyclic loadings, and a numerical behavioral model is proposed. The hybrid damper investigated in this study was originally developed and experimentally examined in previous research, and the present work aims to extend those studies through numerical analysis. For this purpose, first, the hybrid damper was numerically modeled and verified using a code written in MATLAB software. Then, the behavior of the damper under cyclic loadings was investigated by altering the main parameters, such as length and diameter of the inelastic part, length of the elastic part, number of bars, and steel grade through a systematic numerical parametric study. In the next step, a numerical hysteretic behavioral model was proposed for the damper by which the nonlinear response could be simulated. Based on the obtained results, as the diameter and length of the inelastic part as well as the number of the steel bars increase, the energy dissipation capacity of the damper improves, and also the contribution of the SMA bars to the self-centering behavior is enhanced. However, increasing the length of the elastic part of the steel and SMA bars reduces the energy dissipation and residual displacement values, which ultimately does not enhance the dampers’ behavior. Finally, the developed behavioral model was verified using available experimental results. The results revealed that the proposed model is sufficiently accurate for numerically simulating the behavior and performance of the hybrid damper composed of steel and SMA bars under cyclic displacement-controlled loading.

Keywords

Hybrid Damper

SMA Bars

Steel Bars

Effective Parameters

Analytical Behavioral Model

Subjects

Earthquake Engineering

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