DESIGN - Prestressed Concrete Transmission Pole Structures - page 39

Fig. 4-7. Guyed reverse taper concrete poles
Source: Photograph courtesy of Valmont Newmark. Reproduced with
permission.
best be matched to the applied loads when specifi c height, confi guration,
and loading have been developed by the Purchaser and evaluated by the
engineer. When replacing wood poles with concrete poles, it is recom-
mended that the engineer be involved in the design process and that the
pole designs be based on specifi c applied loads.
DESIGN CRITERIA
Distinct design conditions that may be considered in the design of a
prestressed concrete pole are outlined as follows. This section deals pri-
marily with the design of the pole shaft. If designing structures with guys
or with multiple poles, other design considerations may be necessary.
Ultimate Strength
The ultimate fl exural strength of a pole is the point at which the pole
will fail, usually by compressive failure of the concrete. The pole should