Bridge Management, Inspection and Sustainability
Full Session with Abstracts
341437-2 - Design phase of life in coastal bridges to minimize environmental impacts and improve resiliency
Friday, April 20
9:30 AM - 10:30 AM
Over the 20th century, average sea-level has risen by a total of 6.7 inches globally, and rises in sea level heighten the surge risk associated with extreme storm events. Hurricanes and other severe storms have proven themselves to be one of the major threats to transportation assets throughout the world, particularly to bridges located along the coastlines. There are nearly 60,000 miles of roads located along the coastal regions of the United States susceptible to tropical storm and hurricane induced surge and waves. Current study, funded by the Georgia Department of Transportation, investigates the vulnerability of bridges along the Atlantic coast of Georgia and produces a fragility surface which describes the probability of failure such as deck unseating in terms of hurricane categories. Improved resiliency largely provides environmental benefits such as reduced construction and demolition materials. Therefore, this study is focused on the design phase of life and recommendations for bridge bearing connections between superstructure and substructure systems. Dowels are often used in bearing connections because they are easy to install and protected from corrosive coastal environment. They also enable the rapid construction of precast bridges, which minimize environmental impacts. It is concluded from this study that anchor bolts are generally more effective in providing vertical uplifting resistance to hurricane-induced forces although they are more susceptible to corrosion damage. Stainless steel bolts and precast bridge systems including dowels used in conjunction with restrainers which optimize the sustainability performance of coastal bridges will also be discussed.