My Bridges I built a beam bridge with just a piece of paper and paperclip. The books had to be 20 cm. apart. It held the weight of 100 pennies. I looked up pictures on the internet and one of the pictures gave me an idea. My bridge is built the Manchac Swamp bridge. s Before After 2
Suspension Bridges A suspension bridge ishung by cables which hangfrom towers. The cablestransfer weight to the ground.The Golden Gate Bridge is asuspension bridge. Theystarted constructing the bridgeon January 5, 1933 and endedin 1937. It is located in SanFrancisco, California. It costover 35 million dollars toconstruct. Before bridges werebuilt the main transportationwas ferries.
Beam Bridges s A beam Bridge is made up of two or more supports holding up a beam. The Manchac Swamp bridge is a beam bridge. It is located in Louisiana and is the second longest in the United States. This bridge carries Interstate 55 across the swamp. It is about 22.80 miles and costs about 196 million dollars to build. They opened it 1979.
Arch Bridges An arch bridge is a bridge where weight is carried outward along two paths curving. The Navajo Bridge is an arch bridge in Arizona. It is actually is two bridges right next to each other but they have the same names. They both cross over the Colorado River and Marble Canyon. They are part of Route 89A. It takes you toward Utah and the rim of the Grand Canyon. They started building in 1927 and finished in 1929. It is about 157.80 miles long. 5
Cable-stay Bridges A cable-stay bridge is a lot like a suspension bridge except they go straight to the road deck and not from tower to tower. The John James Audubon is a cable-stay bridge It is located in Louisiana and crosses the Mississippi. It was officially connected on December 29, 2010 but wasn’t opened until May 5, 2011 due to flooding. 6
My 2nd bridge s I built my bridge like the John James Audubon bridge. It is a cable-stay bridge. It is made out of five cups, a piece of yarn, and clay. It held the weight of 100 pennies and the books were still 20 cm. 7