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Message: [QUOTE="NJCuse97, post: 3288341, member: 5058"] A truss is typically made up of a top and bottom chord and webbing. The top chord in our case is what we are calling the girders. The “missing link” is a piece of the top chord. The “spirals” are the webbing. In our truss, the top chord acts as a compression ring. This is a crucial element to many domes (meant as a structural term, not necessarily an architectural one). The famous hole in the Roman Pantheon is enabled by a compression ring. All of the force on that ring is squeezing in. The ring itself is essentially pushing out to prevent the ring from falling in. Our ring would have been designed to take on the additional load that will be put on it by hanging the roof (which will again, pull down and in). In this way, to your question, the truss is designed to fall inward, hence the tilt in. When they are all connected, the “girders” will act like one piece, the chord and compression ring all in one. The webbing or “spirals” take some of the weight and force from the top chord and send it to the bottom chord, the concrete ring that they are attached to the sits at the top of the wall. The bottom chord will be in tension. Think of it like holding two ropes and someone at either end pulling away from you. That pull effort is tension. For a truss to work, the loads and the forces they create must be resolved, or essentially neutralized. For all the push force, or compression that the top chord is dealing with, the bottom chord and the webbing must resolve with equal and opposite force, in this case tension. The weight of the whole truss itself is likely carried or resolved by the wall itself, or more specifically the columns in the wall (where the back stays are attached). Hope this helps some. [/QUOTE]

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