Class 5 1, lb. Compression (psi). Tension (psi). Bending Capacity = k x fiber strength x C3 (ft-lb). Fiber Strength. Fiber Stress. Modulus of Rupture. ANSI O 4. ANSI. American National Standards Institute. 4 ANSI accredits the procedures of standards developing organizations. National ANSI O – Wood Poles. (ANSI) publishes such a standard: ANSI , Wood. Poles, Specifications, and Dimensions (2). Mem bers of ANSI Committee 05 periodically review and update .

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In some cases, the projected values were higher than the observed and in other cases lower. Results and Application This derivation was found to result in a design methodology that has a good correlation with the test data see examples in Figures Since the Table 1 values in the ANSI standard are supposed to be true groundline MORs, and since the earlier data on distribution poles closely represented a true groundline MOR, the transmission data had to be reported on a similar basis in order for the data to be combined as measurements of the same material property, the actual groundline MOR.

Therefore, the test data needed to nasi adjusted to account for the effects of conditioning so that expected strength correlates with the test data.

We strongly suggest that Annex A be read and understood before designing a wood pole structure under this standard. The observed groundline stress is another value that comes into play when a pole breaks above the groundline during a test. Subscription pricing is determined by: MAT file you can download below. However, the formula provides a rational method for estimating a true groundline MOR when only the true MOR at an above ground failure location is known.


You may delete a document from your Alert Profile at any time. Please help us to share our service with your friends. Available for Subscriptions Available in Packages Standard is included in: This standard provides minimum specifications for the quality and dimensions of wood poles that are to be used as single-pole utility structures.

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ANSI O – Wood Poles – Specifications and Dimensions

The fiber stress is greater and the circumference 50.1 larger at the lower points on the pole so the ultimate pole capacity increases. This paper will provide an overview of the fiber stress derivation that was used to reevaluate the test data. This value is the fiber stress that was occurring at the groundline when the pole broke at a location above ground. These strength reduction factors will not be used on poles 55 feet and shorter as per Annex A.

The average pole is going to be one-half of a class larger so the actual average strength will be midway between classes. No adjustment for variability ani.

The resulting projected fiber stress values at the groundline varied compared to the observed groundline stress due to actual pole qnsi. Fiber strength values, provided as a basis for determining pole class sizes, apply only to poles that meet or exceed the minimum quality specifications.

Should you need to use one of these three materials, you must determine the correct properties for your jurisdictions and incorporate them into your library.


The same pole unincised, groundline or full length standard incising treated with Penta or Copper Naphthenate in Oil or Creosote will weigh lbs. Rather than determining how the newer EPRI data affects the fiber stress values in FPL 39, this derivation began with the combined raw test data and made the following assumptions and adjustments. Size px x x x x Thank you for interesting in our services. If the maximum stress point is above ground, adjust the fiber stress per the height adjustment equation and use the minimum dimension at that height.

This results in Douglas Fir poles having a density of 56 to 65 pcf, depending on the treatment process. This is the true material property. MAT below does not include these three pole properties. As the voice of anei U. As the load point is applied at lower heights, the maximum stress point moves lower on the pole.

ANSI O5.1 Wood Pole Specification Update

It is up to the engineer to determine what final density to use based on the treatment and other factors. We are a non-profit group that run this website to share documents. No test data from small clears All data combined for this derivation was from full-scale 05.1 of green, untreated poles.