Abstract
Adequate reinforcement detailing is paramount if one is to rely on confined properties of concrete. This paper describes the design and the confinement reinforcement detailing applied for the installation of the 1915 Çanakkale Bridge tower foundation tie-beam.
The 1915 Çanakkale Bridge in Turkey is a suspension bridge which carries the new Malkara-Çanakkale Motorway across the Dardanelles strait. Each of the tower foundations consists of a rectangular concrete caisson base, with composite shafts to support the tower legs. At the top of each shaft there is a massive 11m thick concrete plinth of 18m diameter to distribute the tower loads into the foundation. The shafts are connected by a pre-fabricated reinforced concrete tie-beam (10.5m wide × 8.25m high) to ensure that the foundation works as a frame structure under ship impact and seismic loading.
The prefabricated tie-beam was constructed onshore, placed on a submergible barge, towed to site and then lowered down onto cast-in steel brackets on the plinths. The concentrated loads from the steel brackets were introduced to the plinth by corbel action. Here the stress from the support brackets was found to be 1.2 times higher than the uniaxial design concrete compressive strength. Headed bars were used in the reinforcement detailing to provide confinement within the concrete, in accordance with the principles of fib Model Code 2010.
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Acknowledgements
This paper is based on the detailed design of the 1915 Çanakkale Bridge undertaken for the contractor DLSY (Daelim, Limak, SK E&C and Yapı Merkezi) by COWI A/S.
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Ravn, U.G., Costa, J., Löhning, T. (2023). The 1915 Çanakkale Bridge – Design and Detailing of Corbels with High Concentrated Loads. In: Ilki, A., Çavunt, D., Çavunt, Y.S. (eds) Building for the Future: Durable, Sustainable, Resilient. fib Symposium 2023. Lecture Notes in Civil Engineering, vol 350. Springer, Cham. https://doi.org/10.1007/978-3-031-32511-3_175
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DOI: https://doi.org/10.1007/978-3-031-32511-3_175
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