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Shape memory allow-magnetorheological fluid core bracing system Zareie, Shahin

Abstract

Magnetorheological fluid (MRF) and shape memory alloy (SMA) are two smart materials used in many protective systems in civil engineering to mitigate unpredicted hazards. Isolation systems, dampers, and bracing systems are examples of smart protective systems integrated with civil infrastructures, such as building, to enhance their dynamic behaviour. Among them, bracing systems are the most common technique to keep buildings safe and healthy under seismic loads. In this study, both materials are used to develop a new bracing system called the SMA-MRF core-based bracing. A prototype of the system is fabricated and tested by the loading frame machine to prove the functionality of the system regardless of loading directions. Then, a numerical model of the systems is developed in the Open System for Earthquake Engineering Simulation (OpenSees). This model is implemented in a simplified two-story steel frame and exposed to the simulated ground motions. It is noted that the system improves the structural dynamic behaviour, such as the drift ratio, in the time-domain as well as frequency-domain. A control strategy is applied to the SMA-MRF core bracing systems. It is found that the system enhances the dynamic response with the embedded controller. The experimental results indicate that pre-straining SMA elements lead to a sharp increase in the energy absorption capacity as well as the recovery ability under short and long-term loadings. It is worth mentioning that the pre-strained SMA maintains the specifications, particularly the recovery capability, rather than conventional SMA under simulated short- and long-term loading.

Item Metadata

Title
Shape memory allow-magnetorheological fluid core bracing system
Creator
Zareie, Shahin
Publisher
University of British Columbia
Date Issued
2020
Description
Magnetorheological fluid (MRF) and shape memory alloy (SMA) are two smart materials used in many protective systems in civil engineering to mitigate unpredicted hazards. Isolation systems, dampers, and bracing systems are examples of smart protective systems integrated with civil infrastructures, such as building, to enhance their dynamic behaviour. Among them, bracing systems are the most common technique to keep buildings safe and healthy under seismic loads. In this study, both materials are used to develop a new bracing system called the SMA-MRF core-based bracing. A prototype of the system is fabricated and tested by the loading frame machine to prove the functionality of the system regardless of loading directions. Then, a numerical model of the systems is developed in the Open System for Earthquake Engineering Simulation (OpenSees). This model is implemented in a simplified two-story steel frame and exposed to the simulated ground motions. It is noted that the system improves the structural dynamic behaviour, such as the drift ratio, in the time-domain as well as frequency-domain. A control strategy is applied to the SMA-MRF core bracing systems. It is found that the system enhances the dynamic response with the embedded controller. The experimental results indicate that pre-straining SMA elements lead to a sharp increase in the energy absorption capacity as well as the recovery ability under short and long-term loadings. It is worth mentioning that the pre-strained SMA maintains the specifications, particularly the recovery capability, rather than conventional SMA under simulated short- and long-term loading.
Genre
Thesis/Dissertation
Type
Text
Language
eng
Date Available
2020-10-05
Provider
Vancouver : University of British Columbia Library
Rights
Attribution-NonCommercial-NoDerivatives 4.0 International
DOI
10.14288/1.0394707
URI
http://hdl.handle.net/2429/76250
Degree
Doctor of Philosophy - PhD
Program
Civil Engineering
Affiliation
Applied Science, Faculty of; Engineering, School of (Okanagan)
Degree Grantor
University of British Columbia
Graduation Date
2020-11
Campus
UBCO
Scholarly Level
Graduate
Rights URI
http://creativecommons.org/licenses/by-nc-nd/4.0/
Aggregated Source Repository
DSpace

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Attribution-NonCommercial-NoDerivatives 4.0 International