DEAD AND WIND LOAD STRESSES 



'37 



sumed horizontal reactions. For example, the stress in \-x in the arch 

 equals + 60000 18000 x 1.67 = + 29800 Ibs. Stress in i-y equals 

 25000 + 32000 x i . 67 = + 28440 Ibs. 



Dead and Wind Load Stresses in Arch. In Fig. 74, (b) is the 

 stress diagram for the arch as a simple truss loaded with dead and wind 

 loads as shown in (a). Table IX gives the same data for this case as 



lo 1 ^o so* 



Simple Truss 

 Dead and Wind Loads 



(a) 



Simple Truss N, 



Dead and Wind Load Stress Diaqrar 



ul 



Simple Truss 



H- 20000 Ibs. 



(C) 



FIG. 74. 



Stress Diagram , H =20000 Ibs. 

 (d) 



are given in Table VII for the simple truss with vertical loads. The 

 deformation diagram for the deformations given in column 6, Table 

 IX, is shown in (b) Fig. 75. In drawing the deformation diagram for 

 this case the member marked i was assumed to be fixed in position and 

 the other members were assumed free to move. The horizontal dis- 

 tance between L and L' will be the total deformation required. 



