254 STRESSES IN A SUBDIVIDED WARREN TRUSS. Art. 132. 



in a manner exactly similar to those for the Pratt truss of Art. 

 130. The stresses will be figured for the following data: 



Weight of trusses and bracing = 1200 Ibs. per ft. of bridge 

 Weight of floor system = 1000 Ibs. per ft. of bridge 



Total dead load =2200 Ibs. per ft. of bridge 

 Live load =4000 Ibs. per ft. of bridge 

 From these data the following values are found : 



Dead load panel load 



2200 



X 20 =22,000 Ibs. 



Live load panel load =X20 =40,000 Ibs. 



|2<1200 = _3_ 

 ~~11* 



2200 



Diagonal length =34.4 ft. 



Sec 



Diagonal Stresses. 



34.4 



34.4 



28 



a 20 



tan 6=. 



28 



D i= 3i X 22,OOOX : ^-=+ 94,600 Ibs. D. L. 



=3^X40,000 X =+172,000 Ibs. L. L. 



28 _ 



+266,600 Ibs. Total. 



04 A 



D,=2^X22.000X-- = - 67,600 Ibs. D. L. 



28 



= - 129,000 Ibs. L. L. 



- 196,600 Ibs. Total. 



... 04 A ..... 



= HX22,OOOX--= + 40,500 Ibs. D. L. 



28 



04 A 



=^. X 40,OOOX--= + 92,100 Ibs. L. L. 



- + 132,600 



04 A 



D 4 = iX22,OOOX--=- 13,500 Ibs. D. L. 



28 



34.4 



28 



- 61,400 Ibs. L. L. 



- 74,900 Ibs. Total. 



