Shared Resource Bridges Falling Down
We've all heard the nursery rhyme “London Bridge Is Falling Down,” but bridges are actually falling down all around the world. A structurally deficient bridge is one that requires renovation. According to a 2019 report from the American Road and Transportation Builders Association, America alone has more than 47,000 structurally deficient bridges. In this Authentic Learning Unit, students are tasked with developing a design for the renovation of a structurally deficient bridge or a new bridge based on the traffic flow, geography, and needs of an area. In the process, they will learn about bridge efficiency; the purpose, function, and force distribution of the four main types of bridges; and how to calculate and use scale factor, and they share their solution with the state Department of Transportation.
Bridges Falling Down

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