Innovative Hybrid Bracing Systems for Enhancing Infrastructure Resilience

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A concerning volume of municipal infrastructure is in deplorable condition. Thus, infrastructure requires immediate and necessary action, as the rehabilitation or replacement of these assets is essential in the following 5-10 years to ensure that the services it provides continue to meet the community's expectations. An even larger proportion of municipal infrastructure is considered in fair condition, requiring attention and procedures to be implemented in the medium and long term. Infrastructure reports published in Canada and the US reflects the vulnerability of our existing infrastructure. Hence, it is imperative to take immediate measures to develop innovative, low-cost, and reliable construction and retrofitting solutions for addressing the current situation. Apart from the risks inherent to building design, use, age and construction material, there are many instances where hazards other than earthquakes may put buildings at risk, ranging from technical failures to severe weather. High winds, freezing rain and heavy snow loads, and other environmental conditions may impose stresses on existing structures. Although most of these events may not result in a collapse, these extreme events could exceed the threshold defined in the Building Code in terms of serviceability. They may result in the loss of functionality as well as non-structural damages. The proposed research program aims to reduce overall vulnerability through innovations in structural systems and the transfer of knowledge to practice. The proposed research will develop innovative hybrid lateral force resisting systems. Super-elastic Shape Memory Alloy (SMA) will be utilized along with regular reinforcement materials for developing self-centring bracing devices that can help structure bring back to its upright position after lateral loads. In addition, other smart materials will be utilized, such as Friction Springs (FS) and Polyurethane. Different combinations will be developed by employing two or more materials in these hybrid devices to achieve better performance. Component testing will be carried out under different loading conditions. Based on the experimental testing and results, the numerical models will be further refined, and extensive dynamic simulations will be conducted. Response modification factors will be investigated, and vulnerability assessment will be conducted. This research will help Canada to meet the need for smart structures and train high quality personnel on the development of such structures and their components. This will provide the infrastructure industry with inherent sustainability and ability to absorb the consequences of extreme load events. The significance of this research is paramount as it ensures improved safety and security against a variety of hazards of different magnitudes and will lead Canada to a sustainable solution for infrastructure and its management.