![]() It features two graceful arches that support the roadway. It was opened to traffic in 1994 and was the first arch bridge in the United States to be built from segments of precast concrete, a highly economical material.ĭespite the cost-effectiveness of this structure, it’s an extraordinary addition to its natural environment. The Natchez Trace Parkway Bridge is a sleek yet cost-effective addition to its natural setting.Īnother contemporary iconic arch bridge is the Natchez Trace Parkway Bridge in Franklin, Tennessee. ![]() An example is the inspiring 1,700-foot span over the New River Gorge in West Virginia, which was completed in the late 1970s. More recently, steel and prestressed concrete have made it possible to build longer and more open arches. It frames its natural environment in an elegant way. The New River Gorge bridge is an example of a modern-age arch bridge. Those in the lower levels are held together by careful cutting and positioning and the force of their own weight. The builders used mortar to secure the stones together only in its top tier. One of the most famous examples of a stone arch bridge is the Pont du Gard aqueduct built by the Romans near Nîmes, France. The Pont du Gard is an ancient arch bridge built of carefully cut and placed stones. Throughout history, different civilizations have used a variety of materials to make arch bridges strong, to great - and lasting - structural and aesthetic effect. However, there are ancient examples that cross very long distances by using multiple arches and contemporary ones that leverage modern engineering techniques and materials to extend their length. That’s why they must be built of materials that can withstand extraordinary forces.Īrch bridges typically span shorter distances because of the limited stress levels that arches are able to withstand. When arch bridges support their own weight and that of the vehicles, railroads, pedestrians, and other things that cross it, all parts of the arch are under compression. These supports, called abutments, carry the load and prevent the ends of the bridge from collapsing outward. Instead of pushing forces downward, the weight of arch bridges is pushed outward along the arch to the structural supports on either end. The locations and situations they’re right for.Īrch bridges are among the oldest crossings on earth.It’s because designers and engineers have found the ideal structural solution to span a body of water, valley, or roadway. 26, 2019 Bridge Masters Bridge DesignĮver wonder why certain bridges are so transformative and perfect for their locations?
0 Comments
Leave a Reply. |