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[QUOTE="sutomcat, post: 3140854, member: 27"]
I am not an architect and am hoping [USER=5058]NJCuse97[/USER] or someone else smarter than me can confirm this, but this is how I understand it:
 
The crown truss is held aloft by support beams that all lean inwards, towards the center of the roof.  Those beams want to follow the force of gravity based on the direction they are leaning, and fall down into the center of the roof.

But the crown truss holds all that force and prevents an inward collapse based on its thickness and strength.  Note that the cross truss part of the roof (the roller coaster part) features the thickest and strongest steel in the roof.  This downward force compresses the crown truss and helps hold it together, using the extremely powerful forces of gravity to hold the truss in place.  It can't collapse because the cross truss is too strong to allow this.

The weight of all the steel is the key holding it in place, supported and secure.
Once the crown truss is in place, cables can be run from it to hold up each of the individual PTFE based 'mini domes' that compromise the interior part of the roof.

This is the same principle used with arches, where the keystone holds the force from the sides of the arch and is held in place by the weight of the sides of the arch.

[IMG]https://mediad.publicbroadcasting.net/p/wrvo/files/styles/x_large/public/201805/Dome_exterior.jpg[/IMG]

[ATTACH type="full" alt="1571160742278.jpeg"]171543[/ATTACH]
[/QUOTE]

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