What do you know about America's LARGEST MONUMENT? Join us to learn about the architecture, construction, and impossible engineering of the Gateway Arch in St. Louis, MO.
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The arch grounds were dedicated in 1935 by President Franklin D Roosevelt. In 1948 a contest was held to determine what would be built on the site. Architect Eero Saarinen won the design competition with his proposal for a 630 feet tall stainless steel arch. His design was realized and constructed between 1963 and 1965 as a symbolic representation of the Gateway to the West. Today it stands as America’s largest national monument and the world’s tallest Free standing arch. This monument is open to the public and offers a unique elevator ride to the top where you can see panoramic views of the St. Louis Skyline.

The purpose of creating this memorial was to honor pioneers and explorers such as Lewis and Clark who’s resulting work made western expansion possible for the united states.

The arch got it’s shape from a hyperbolic cosine function known as a catenary. A catenary supports only its own weight through tension. Instead of distributing gravity outwards, the shape allows for thrust to travel downward. Saarinen chose to modify this shape by adding additional weight to the top of arch so that it would appear more rounded making it’s true form an Inverted Weighted Catenary.

The construction of the arch was a marvel of the engineering world at the time as each 12 foot section of prefabricated stainless steel had to be hoisted into places before being filled with concrete and prestressed with 252 tension bars. A scissor truss had to be placed between each leg of the arch in order to keep it steady, the scissor truss spanned 530 feet.

An actuarial firm had predicted that the construction of the arch would suffer up to 13 fatalities based on the fatality rate in the construction of former US monuments, however, this thankfully did not happen and the arch stands as the only national monument of it’s time to have not suffered fatalities during it’s construction.
The total cost of the arch was $13 million dollars, the modern equivalent of nearly 85 million.

Music: Got You Chill by Jimmy Gunnarsson (Provided by StoryBlocks license)

Most footage obtained by This House Media LLC.

Creative Commons Credits:
Photos From Wikipedia unless otherwise stated
Drone footage from YouTube channel: @CalvinTigre
Footage of the interior of the arch from YouTube channel: @GottLove
Lewis and Clark Statue photo credit: [ Ссылка ]
St Louis Star Times Photo Credit: [ Ссылка ]

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Chapters:
Intro 0:00
History 0:26
Architecture 1:13
Construction 1:35
Outro 2:17

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