https://youtu.be/5mLjZRAXRRA
''Bridge Engineering Design Failure''
Think of a stringed instrument or a tennis racket; a tennis ball is the force against the racket.
Dual arches and the cables sway in the opposite direction from the other arch cables swaying.
''It sheered neer the fulcrum''
A cable-stayed bridge has one or more towers (or pylons), from which cables support the bridge deck. A distinctive feature is the cables or stays, which run directly from the tower to the deck, normally forming a fan-like pattern or a series of parallel lines.