Roof Truss Tension Rods

These steel joints are needed to support the overall truss.

Roof truss tension rods.

The main feature of this repair was the installation of post tensioned steel rods designed to relieve the truss bottom chords of overstress due to code prescribed snow loads. Tie rods are supplied with left hand and right hand threads so that they may be. Our in house deep hole drilling capability allows atm to incorporate this technology into its truss design and fabrication. The common news media comment about a truss roof or floor having collapsed suddenly without.

The tension members in the web of the truss are 1 25 inch 3 2 cm diameter wrought iron rods. The same thing is true for the bridge of the truss. Finally the truss calculator will compute the best dimensional method to connect the pieces of the truss with steel joints and a bridge. Steel tension rods can carry in excess of 35 000 pounds of tension in large timber trusses.

The axially connected truss utilizes hidden steel rods to provide tension sufficient to allow greater open spans. Swc can source these rods in a variety of diameters lengths and materials along with appropriately sized clevises to create a clean pinned connection to attachment points. The detail on the left shows ones solution. The trusses are tensioned between the concrete floor slab and the steel roof structure.

The system pretension loading and sizing of the tension rod is determined from the thermal load dead load creep seismic and wind loading conditions specific to the supporting structure. Custom fabricated steel brackets were installed at the heel joints to transfer the top chord loads into the new steel tension rods. The more complex the truss framework is the greater quantity of these joints will be required. A boot is attached to the timber tie with bolts and shear plates transferring the load.

That load needs to be transferred from the rod to the timber truss.