DESIGN OF STRUCTURES 247 
larate and distinct braced web is provided. Fig. 376 is a skeleton 
gram of such a web, this being of lattice pattern, since the wind may 
‘in either direction. Fig. 377 shows in detail the connection of the 
‘and Fig. 378 shows two 
methods of connecting the 
braces at their in- 
rsection B. 
; er under both 
conditions (a) and (db) 
7 (Art. 224) are determined ; Fig. 378. 
in the usual manner, 
and the web members designed to carry them. The stresses in 
- the booms due to the wind are suitably combined with those due to 
other causes, and the booms are designed to carry the resultant 
_ stresses. All the wind pressure stresses should be treated as live load 
226. Overhead and Sway Bracing.—In “through” bridges the top 
booms are often connected together by overhead bracing. If head room 
is limited, this overhead bracing takes the form of a curved girder, such 
Fig. 379. 
as is shown in Fig. 379. Should height permit, sway bracing of the form 
shown in Fig. 380 may be used. 
This overhead bracing may be looked upon as tending to equalisé 
