On February 28th, 2017, The UBC CSCE Student Chapter welcomed Nedim Alca, Vice President of COWI North America, to present on the St Croix River Bridge located in Minnesota, USA. The St Croix River Bridge, almost complete, will be the largest extradosed bridge constructed to date in North America.
Nedim began by explaining how stakeholders impacted the design of the bridge. Since the St Croix River is a designated wild and scenic river, the slope of the bridge was designed to match the mountain line behind it. It also incorporated leaf style columns to minimize obstruction of the view corridor. Furthermore, Nedim explained how the bridge deck was transported via river and had to be carried across the deck span to preserve the wetlands on the approach span and to avoid harming the wildlife. Nedim also explained some of the intensive structural analysis that was conducted to account for wind loads and bending of the deck and their solution for them.
Overall, this was a great lecture highlighted the amount of variables to account for when designing and constructing a bridge of such magnitude. We would like to thank Nedim for taking the time to share this project with us.
Nedim Alca, P.Eng., P.E., Vice President, COWI Bridge North America
Nedim received his B.Sc. in Civil Engineering from the Middle East Technical University, Ankara, Turkey and his M.Sc. in structural engineering from the University of Alberta, Edmonton, Alberta. Other than a one-year sabbatical at wind & dynamics experts RWDI, he has been with COWI (formerly Buckland & Taylor) since 1994. He has worked on the design and construction of bridges of all types and sizes with particular interest in segmental concrete and cable supported bridges.