Which steel roof truss is most applicable to this given scenario and why? A rode
ID: 1730328 • Letter: W
Question
Which steel roof truss is most applicable to this given scenario and why?
A rodeo arena is to be designed to have an enclosed arena with dimensions of 81 m x 40 m for the performance of horses and other animals. The arena is to be used for other purposes such as animal shows, agricultural shows and other community events as well. Entire building is rectangular, with dimensions of 116 m x 68 m. Main span of roof truss is 56 m. Curved steel truss roof, with a main span of 56 m and overhangs of 6 m on each side (to cover the elevated walkways) is to be designed. The arena is designed to accommodate 2000 spectators. Above the walkway level, steel columns are supporting the roof trusses. The roof trusses are spaced at 6 m apart and altogether 20 identical trusses are used (Each truss is designed to have a span of 56 m and overhangs of 6 m on each side as mentioned earlier).
The truss should be constructed using hollow circular, square or rectangular structural steel standard sections. Each roof is to be made in 2 middle sections of 14 m long and 2 end sections of 20 m long (including overhangs), for ease of transport. An individual section has all welded connections. The 4 sections are joined together by bolted connections at site to form the 56 m span with 6 m overhangs at each end. Give sketches and typical dimensions showing the details of the four sections of a truss you consider suitable for the above arena.
Explanation / Answer
Since the clear span for the truss is about 56m.The best type of truss to withstand such huge space is quadrangular truss.
Since the load distribution in this truss is very effective.The diagonal members are in tension and the vertical members are in compression.As only vertical members are in compression ,we can use short vertical members and thereby we can reduce the rise of truss leading to minimum cost.
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