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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We have also provided a complete file ansi. The derivation applied the formula in reverse in order to provide an estimate of actual groundline MOR, and if the resulting pole capacity correlated well with the test data, then designers would have a method to reliably project pole capacity. It is up to the engineer to determine what final density to use based on the treatment and other factors. The factor varies for species and between different classes.

For poles that break above the groundline, it is important to note the difference between the theoretical projected fiber stress at the groundline and the observed groundline fiber stress.

MAT below does not include these three pole properties. This was important for pole installations where the maximum stress point is likely to occur above ground.

ANSI O – Wood Poles – Specifications and Dimensions

One other result of this exercise was the confirmation that pole capacity on taller poles changes depending on the height of the applied loads. 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.


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. The following factors adjusted the test data to account for the effects of conditioning during the treatment process.

Size px x x x x This is the true material property. No adjustment for variability 3. No adjustment for load sharing 2.

PLS-POLE ANSI Wood Pole Component Files

We have no amendments or corrections for this standard. Need more than one copy?

Available for Subscriptions Available in Packages Standard is included in: Class Oversize Adjustment The class oversize is applied to the actual measured MOR calculated from the actual dimensions. This standard is also available to be included in Standards Subscriptions. We strongly suggest that Annex A be read and understood but not necessarily agreed to before designing a wood pole structure under this standard. Conditioning Adjustment The test poles were not conditioned for treatment.

These calculated pole capacities show a good correlation with the test data. If the maximum stress point is at the groundline, the pole capacity is based on the Table 1 fiber stress and minimum pole dimensions. Should you need to use one of these three materials you must determine the correct properties for your jurisdictions and incorporate them into their library. Please copy and paste this embed script to where you want to embed Embed Script. Subscription pricing is determined by: We need your help!

However, utilities use poles that are conditioned and treated before going into service.

Different conditioning methods affect pole strength to different degrees. 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. Standards Subsctiption may be the perfect solution. In some cases, the projected values were higher than the observed and in other cases lower.


A derivation of fiber stress values based on a combined data set of the ASTM distribution and EPRI transmission full-scale pole tests resulted andi some changes in the standard. MAT file you can download below. This results in Douglas Fir poles having a density of 56 to 65 pcf, depending on the treatment process. Proceed to Checkout Continue Shopping.

ANSI O5.1 Wood Pole Specification Update

The fiber stress is greater and the circumference is larger at the lower points on the pole so the ultimate pole capacity increases. Thank you for interesting in our services. Please first verify your email before subscribing to alerts. We need your help to maintenance this website. The MOR will increase above groundline due to drying to equilibrium conditions as compared to test results of green poles.

This value is the fiber stress that was occurring at the groundline when the pole broke at a location above ground. Therefore, the test data needed to be adjusted to account for the effects of conditioning so that expected strength correlates 05.1 the test data.

The observed groundline stress is another value that comes into play when a pole breaks above the groundline during a test.