How Forces Flow in a Suspension Bridge
The roles of cables, towers, and anchorages
1:00 · 720p · With AI narration and captions. This sample was made with the same system as this service.
Narration (full text)
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Suspension Bridge Forces
The secret to how suspension bridges span long distances lies in how forces flow.
Parts of the Bridge
The main cables pass over the towers and are fixed to anchorages at both ends. The deck hangs from them on hangers.
Weight to the Cables
The weight of the deck and cars pulls on the hangers and passes into the main cables. The force on the cables is a pulling force: tension.
Towers & Anchorages
The cables press the towers down, and the towers pass this pushing force, compression, to their foundations. The anchorages at both ends hold the cables' pull.
When a Car Crosses
When a car crosses, the hangers right above it are pulled hard, and the force flows through the cables to the towers and anchorages.
Inside the Cable
A main cable is a bundle of many thin steel wires, so it can withstand great tension.
Tension and Compression
Suspension bridges can span long distances by sending weight to the ground through tension and compression.
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