2019 CSCE Annual Conference - Laval (Greater Montreal)

2019 CSCE Annual Conference - Laval (Greater Montreal) Conference

A shape memory alloy-magnetorheological fluid core bracing system for civil engineering applications: feasibility study

Mr. shahin zareie, The University of British Columbia (Presenter)
Dr. Shahria Alam, University of British Columbia
Dr. Rudolf J. Seethaler, University of British Colombia
Dr. Abolghassem Zabihollah

The stability of civil infrastructure is one of the main challenges for structural designers, users, and decision makers at the government level. To keep the stability and functionality of structures against moderate and strong loads, extensive studies have been conducted to develop supplemental structural control systems, particularly bracing system, with the energy dissipation ability. 

For instance, bracing systems fitted with friction dampers, and viscous fluids are mounted in structural frames to provide the structural integrity against possible damage. These kinds of bracing systems are passive devices. Furthermore, most of the existing active and semi-active supplemental system integrated with bracing systems are not able to return the system to the initial position (the recentering ability).. Therefore, in the past few years, new hybrid smart structural elements integrated with smart materials,  shape memory alloy and magnetorheological fluid, have been developed to structural stability and enhance the recentering ability of structural elements in infrastructures.

In this study, a hybrid smart bracing system is introduced to partially dissipate the amount of energy and add the recentering ability to the structure. The new hybrid smart bracing element consists of the shape memory alloy (SMA) fitted with magnetorheological (MR) fluid in its core. This system is able to keep the integrity and enhance the dynamic behavior of civil infrastructure during seismic events. simplicity to implement, easy to install, low operation and maintenance costs, energy dissipation capacity, the recentering ability, and fast responses are counted as the advantages of the present hybrid smart bracing system.