The Verrazzano-Narrows Bridge, which opened in 1964 as the world's longest suspension bridge at 1,298 meters, demonstrates how engineers must account for Earth's curvature (causing towers to be 4 cm wider apart at the top than the base), thermal expansion (making the deck drop 3.5 meters between summer and winter), and wind forces (causing 19 cm tower sway) when designing massive infrastructure projects.
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The Verrazzano Bridge - New York City's GemAjouté :
The Verrazano-Narrows Bridge connects [music] Brooklyn to Staten Island across the entrance to New York Harbor. When it opened in 1964, it was the longest suspension bridge [music] in the world at 1,298 m. The two towers stand 210 m above the water.
>> [music] >> Because the Earth curves, the towers are 4 cm further apart at the top than at the base, even though both are perfectly vertical. The bridge deck expands and contracts so much with temperature [music] that it sits about 3.5 m lower in summer than in winter. The towers themselves sway 19 cm in [music] strong winds.
Every year, the bridge hosts the start of the New York City Marathon, the only time pedestrians are allowed on it.
Around 185,000 vehicles use it [music] every single day.
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