UAS FH Construction Update for 1/17/2014
This week the Contractor put up the Trusses on the UAS Freshman Resident Hall II. The Contractor has just started on the last floor on Hall I and will be putting up Trusses on Hall I in the next week or so. These Trusses top out the building and gives us a good feel for how large the Freshman Resident Hall really is. What a nice addition this will be to our campus.
UAS Freshman Residence Hall 8:30 AM 1-17-2014
Good question. Best way to explain this is with an example. Say we want to cover a room that is 5 feet wide. We could use a beam, like a wood 2x4. Now if that room was 10 feet wide, we would need to make our beam deeper to something like a wood 2x12. Now if that room was 20 feet wide we would have to make our beam even deeper to something like a wood 2x30. As you can see that as the room gets wider, or the weight on the top of the room gets heavier, the beam needs to get deeper. These deep beams require a lot of material, (wood, steel, etc.) and much of the material is not being used to its fullest potential. The material in the top of the beam is typically under compression and the material in the bottom of the beam us under tension. The material in the middle of the beam has very little stress. See Figure.
The Idea behind a Truss is to remove most of that material in the middle to reduce cost. Trusses are usually more efficient and less costly to cover rooms, buildings and houses when they get wider than 20 feet.
Trusses come in all shapes and sizes. The Freshman Residential Housing uses A Shaped Trusses. Next time when in one of the large box stores in Juneau, look up and you will see they use Flat Truss. which you can imagine as a very deep beam with all of the wasted material removed.
Contractor working on UAS Trusses
Trusses are made from the Simple and Stable Triangle