Design of Steel Transmission Pole Structures (ASCE/SEI 48-11 by American Society of Civil Engineers
By American Society of Civil Engineers
This normal offers a uniform foundation for the layout, detailing, fabrication, checking out, meeting, and erection of metal tubular constructions for electric transmission poles. those guidance observe to cold-formed unmarried- and multipole tubular metal buildings that aid overhead transmission strains. The layout parameters are appropriate to guyed and self-supporting buildings utilizing numerous foundations, together with concrete caissons, metal piling, and direct embedment. regular ASCE/SEI 48-11 replaces the former variation (ASCE/SEI 48-05) and revises a few formulation which are according to different present criteria. This commonplace encompasses a special observation and appendixes with explanatory and supplementary info. This normal should be a main reference for structural engineers and development managers thinking about designing and construction electric transmission traces, in addition to engineers and others focused on the electrical energy transmission undefined.
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Extra info for Design of Steel Transmission Pole Structures (ASCE/SEI 48-11 Standard)
Reinforcement at these bolted connections can aid the pole section in resisting these induced forces. Often, spanning the bend lines of the pole section with a plate washer can add to the strength of the thru-bolt connection. in an area of minor stress, the loss of moment capacity may be insignificant. If the hole is in an area of high stress, the loss of moment capacity could be significant and should be taken into consideration. 7. Bolt shear strength is not given much consideration in most wood pole connections because of the large bearing area and the use of cleated washers to distribute loads.
3. Historical climatic conditions in the utility’s service area may indicate loads in excess of legislated loads. These may include wind or ice, or any combination thereof, at a specified temperature. 4. Local terrain and line routing procedures will determine the individual structure orientation criteria. 5. , or the need for “hot line” maintenance capability. 6. Individual utility planning criteria and experience may require the need for a load condition to prevent progressive line failure (cascading).
For example, typical attachments that induce heavy concentrated forces caused by davit arm or X-brace connections with traditional through-bolt details can introduce forces significant enough to cause a local buckling of the pole wall in the region of the bolting hardware. Reinforcement at these bolted connections can aid the pole section in resisting these induced forces. Often, spanning the bend lines of the pole section with a plate washer can add to the strength of the thru-bolt connection.