Bracing s are use to interconnect the legs of transmission lines and framing angel of bracing and main leg of transmission towers should not exceed more than 15 degrees.Members of transmission towers are designed to compression and tension loads. Following are various patterns were use for bracing in Transmission towers.
Double web system
Single web system
Single web Bracing System
In this single web bracing system the struts designed in compress and diagonal of in tension .This bracing system got narrow base and these types of bracing are much use in 66kV transmission line.Single web bracing system consist diagonal and struts of an all diagonals of transmission tower and this bracing system is widely use for narrow based transmission towers.
Warren bracing System is widely use for both large and small towers. In warren bracing system tension diagonal will give effective support to compression one at point of connections.
Pratt bracing system use for large deflection under heavy load and unequal shears at top of the focus stubs for design.Pratt type of bracing system is also use of bottom two or three panels and warren bracing . In this bracing system share carried by diagonal members as shown in figure.