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Confirmation of Candidate - Candidate : Shahrad Ebrahimzadeh

Post-Tensioned Pre-Cast Segmental Decks for Flood Resilient Pontoons
When
13 OCT 2022
10.00 AM - 11.30 AM
Where
Online

The 2022 flood event in Queensland and New South Wales is recorded as the second most expensive natural disaster in Australia's history, exceedingly even 1974's Cyclone Tracy in Darwin. It is estimated that more than $5.5 billion worth of critical infrastructure was damaged during this flood event, including many publicly and privately owned pontoons. In Brisbane alone, the widespread damage to pontoons and similar types of infrastructure costs more than $300 million. Thus, a better design and building approach is needed to improve the flood resilience of this type of infrastructure. This proposed study will develop a new, effective, and highly durable pontoon design through segmental pontoon concrete decks reinforced and post-tensioned with fiber-reinforced polymer (FRP) bars. The high-strength and non-corrosive properties of FRP bars will make concrete pontoons more resilient to high wave actions during flooding and highly durable in the aggressive marine environment. Moreover, the design of pontoon segments will facilitate handling, transport, and installation on-site, minimizing damage and/or replacement costs. The segmental design will allow better flexibility in future repair and replacement as only the damaged segment will be replaced compared to the entire decks for the pontoons designed and manufactured using traditional construction materials and construction systems. It is important however to have a detailed understanding of the structural performance of the segmental precast pontoons under the imposed loads of hydrodynamic, wind forces, and small vessel/debris impacts. Moreover, the effects of the level of prestressing, spacing of prestressing, width, and the number of segments will be evaluated to come up with an optimal design for flood-resilient pontoon decks. The results of this project will contribute to the Southern Queensland Floods State Recovery and Resilience Plan and to the policies of the local and state governments in Australia to ensure that pontoon and other critical maritime infrastructure is resilient to future severe weather events. Also, this study will develop a new, effective, and highly durable pontoon design through segmental pontoon concrete decks reinforced and post-tensioned with fiber-reinforced polymer (FRP) bars. The high-strength and non-corrosive properties of FRP bars will make concrete pontoons more resilient to high wave actions during flooding and highly durable in the aggressive marine environment. Moreover, the design of pontoon segments will facilitate handling, transport, and installation on-site, minimizing damage and/or replacement costs.

For more information, please email the Graduate Research School or phone 0746 31 1088.