A lot.
For a gable end to gable end installation on 16" spacing you would need 34 trusses, 2 of which would be the gables. If your roof-line has hip ends or will be incorporated into an existing structure there will be more trusses.
The Victoria Falls bridge is supported by many steel trusses
no
There are many places one might go to find more information concerning roof trusses. The most reputable source of information might be the local library.
It is dependent on where you live, but roof trusses are available to purchase and be delivered to your house. Or you could pick up the trusses yourself if you prefer those means.
Hometime - 1986 Attic Trusses was released on: USA: 5 December 2009
Many bridges that use these triangular frames(trusses)are suspension bridges. Like the Mid Hudson bridge for example. Some suspension bridges have their trusses placed below their decks so there is less veiw obstruction. The Mid Hudson bridge and the Whitestone bridge have their trusses placed above their decks and that's why you can see them when driving over them.
With trusses you can obtain high strength of the bridge using rather thin and simple (i.e. cheap) elements. A drawback is that the required height of the side of the bridge rises with the span of the bridge, so trusses become less effective for larger spans compared to the cable bridges. Railway bridges have to sustain higher load than road bridges (trains are heavier), so trusses are an efficient design to increase strength.
Simply put, a truss bridge is just a bridge built by trusses. Trusses are structural frames composed of triangular pieces/joints. So basically a truss bridge is just many triangular structural frames as a support for the bridge.
Busses rhymes with trusses. Let's use the word in a sentence: Since Mitch Longley didn't have a car, he was forced to take the busses.
Roof trusses are used to support the roof and to make certain that the weight of the roof is distributed equally across the building for maximum support.
Archibald De Groot has written: 'Stresses in roof trusses' -- subject(s): Roofs, Trusses, Strains and stresses