| The following tables refer to TAPP's standard
line of steel transmission and distribution poles. These standard poles
are intended to be used as an alternate or supplement to wood poles and
custom designed steel poles. Standard steel poles reduce lead times involved in quotation, design, drawing approval and material ordering.
TAPP offers ten classifications of steel transmission and distribution
poles with groundline moment capacity ratings up to 681 Ft-Kips and
lengths up to 110 feet. However, if the standard pole sizes do not meet
client requirements, a structure can be custom designed to any
specifications.
Design
Development of capacities for TAPP's standard steel poles are based on
the requirements of the NESC and the specified class loading from
ANSI
05.1. These class loadings are multiplied by a factor of 0.625 and then
used to design the equivalent steel pole. This factor is the ratio of
steel and wood overload capacity factors for traverse wind (2.50/4.00). As
specified for wood poles, the load is applied as a concentrated load
located two feet below the top of the pole. For evaluation purposes, the
embedment length is assumed to be 10% of the pole length plus two feet.
Actual embedment depths should be evaluated based on soil conditions or
customer requirements.
TAPP's standard poles are designed using
3/16" minimum wall thickness. In addition, TAPP can also
provide poles with a thinner wall, although we do not recommend their use
for direct burial applications. |
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