Wednesday, August 14, 2013

The Swiss engineer who designed some of America's most beautiful bridges

From wikipedia's article on Othmar Ammann, builder of graceful bridges:
http://www.20min.ch/diashow/49170/49170-0GxNNwE1xJ9A8x6A_947vQ.jpgOthmar Ammann was born nearby Schaffhausen, Switzerland in 1879. His father was a manufacturer and his mother was a hat maker. He received his engineering education at the Polytechnikum in Zürich, Switzerland.  In 1904, he emigrated to the United States, spending his career working mostly in New York City. ... In 1924, he became a naturalized citizen of the United States.

Ammann designed more than half of the eleven bridges that connect New York City to the rest of the United States. His talent and ingenuity helped him create the two longest suspension bridges of his time. Ammann was known for being able to create bridges that were light and inexpensive, yet they were still simple and beautiful. He was able to do this by using the deflection theory. He believed that the weight per foot of the span and the cables would provide enough stiffness so that the bridge would not need any stiffening trusses. This made him popular during the depression era when being able to reduce the cost was crucial.
http://www.route40.net/images/flickr/de-delaware-memorial-bridge.jpg
Delaware Memorial Bridge, 1951
http://www.mta.info/mta/news/releases/images/verrazano.jpg
Verrazano-Narrows Bridge, 1964
http://www.michaelbales.com/wp-content/uploads/2009/02/triborough-bridge1.gif
Triborough Bridge, 1936
http://chasingtheturtle.files.wordpress.com/2012/10/bayonne-bridge1.jpg
Bayonne Bridge, 1931
http://www.uptowncollective.com/wp-content/uploads/2011/05/George-Washington-Bridge-Jay-Franco.jpg
George Washington Bridge, 1931