Photographer's Note

Degrees of Freedom (some mechanics)

The connection between the 8 tapered steel fanned masts and the swivel construction of the cable-stayed swing bridge of the Media City Footbridge initially seems to be designed as an industrial work of art, but of course it is primarily a functional construction that must be strong enough to transmit all the forces that work on it without impeding the intended functioning.

In a mechanical system, which is a bridge construction, it is very important how the directions of forces in the construction is and what forces can perform in the different parts.

The 8 masts in the pylon can transfer the best and safest pressure force. In order to achieve this, the connection between the mast and the foot construction must have sufficient “Degrees of Freedom” to be able to move in other directions than those of the force.
This is achieved with this bridge by making a hinge construction with a large ball, Ball-and-socket joint. This connection avoids that excessive transverse forces can occur in the masts, which could cause the mast to bend.

■ Picture 1: ◄ Ball-and-socket joint ►

■ Picture 2: ◄ 8 Masts ►

■ Picture 3: ◄ The man in Red ►

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Additional Photos by Rob Zwemmer (alvaraalto) Gold Star Critiquer/Gold Star Workshop Editor/Gold Note Writer [C: 5545 W: 327 N: 10657] (41824)
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