of 1000 pounds per lineal foot of truss,will weigh 89,200 pounds; and for the same loading, four 140-footPratt trusses will weigh 44,600 pounds. As the floor systems,etc. for the same pannel lengths would be approximately the sameweight for each type of truss, the economical conclusions may bedrawn… … o A- 0> \ \ 2 mq 3 IfOf I y - o 00 o (0 po 4. $ 0.04 x 89,200 = $5,570.00,and that of the four Pratt- trusses would be $ 0.04 x 44,600 ■ $1,780.00.Thus, it is seen that the four Pratt trusses have an economicaladvantage over the two Petit trusses of $3,570.00 - $1,780.00 = $1,790.00.But in order…
Bridges · Theses
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