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[QUOTE="NJCuse97, post: 3286992, member: 5058"]
I didn’t do well in structures class, but here’s my simple assumptions: the back stays would cause high moment forces on the middle part of the wall, where they are attached. Essentially imagine a giant pushing up on the back stay. The point of attachment will be dealing with an upward, but also outward force. The middle mounting point should allow the full wall to resolve the force. Pull or shear force where the attachment is would be a concern. 
Once the full ring is in place and loaded (tension removed from the back stays) the top chord will face a compression force that will push down and out. That force will be distributed down the spirals and transferred to the bottom chord (the concrete and steel ring the constructed during or right after the “X” bracing in the corners). The force will be less than that on the back stays because the top chord is taking on or resolving some of that load. This is important because now the force is at the top of the wall instead of the middle. The bottom chord will further resolve the load in tension (like a rubber band around your ankles while you try to do a split with weigh on your shoulders. The band takes the load, helping you avoid a nasty groin tear). Half the wall is not used to resolve the load (not a calculation) so the wall cannot take the full load. That is why the truss is so tall and heavy. It has to take on the force and minimize the load on the walls that were not designed to resolve that load.
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