Journal of Structural and Construction Engineering

Journal of Structural and Construction Engineering

Comparison of Seismic Response of Steel Frames Equipped with Buckling-Restrained Braces Made of Steel and Fe-Based Shape Memory Alloy Cores

Document Type : Original Article

Authors
Seyed Sina Kourehli 1
Nader Hoveidae 2
Hadi Rajabi heris 3
1 Assistant Professor, Faculty of Technology and Engineering, Azarbaijan Shahid Madani University, Tabriz, Iran
2 Associate professor, Faculty of Technology and Engineering, Azarbaijan Shahid Madani University, Tabriz, Iran
3 M. Sc student, Faculty of Technology and Engineering, Azarbaijan Shahid Madani University, Tabriz, Iran
10.22065/jsce.2024.441239.3352
Abstract
Braces are one of the structural elements used to withstand lateral forces and provide ductility and stiffness in structures. However, due to the weaknesses of conventional bracing systems such as deformation reduction, buckling under compressive forces, and reduced energy dissipation capacity in cyclic loading, a new generation of braces called shape memory braces has been introduced as a replacement for conventional bracing systems. In recent years, innovative materials such as iron-based shape memory alloys have been used in the construction industry. As a result, a new generation of these alloys, known as iron-based shape memory alloys, with features such as weldability, high formability, high rollability, and cost-effectiveness, has attracted the attention of many engineers and researchers for use in structural components. Given that shape memory alloys based on iron are almost the same price as steel, but have a much higher fatigue life and post-yield stiffness than soft steel, their use in the core of shape memory braces is justified. For this purpose, 4, 10, and 15-story structures were modeled and designed with shape memory bracing with a core made of soft steel and iron-based shape memory alloys, and their seismic behavior was investigated by performing non-linear analyses in SeismoStruct software using incremental dynamic analyses, the values of ductility coefficients, additional resistance, and behavior coefficients in the two bracing systems were evaluated and compared. According to the obtained results, the value of ductility factor is 5.11, additional resistance factor is 1.76, behavior factor is 8.67 for buckling bracing systems with steel core and for buckling bracing systems with iron-based shape memory alloy core, the value of ductility factor is 4.69 the added resistance coefficient was 2.29 and the behavior coefficient was 10.62.
Keywords
Buckling-restrained braced frame
Steel core
Fe-based shape memory alloy
core
Seismic response Incremental Dynamic Analysis

Subjects

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  • Receive Date 12 February 2024
  • Revise Date 13 May 2024
  • Accept Date 05 June 2024