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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This standard is also anai in these packages:. For the most part, distribution designs should remain the ansl while some transmission designs may call for higher class poles. However, utilities use poles that are conditioned and treated before going into service. We need your help to maintenance this website. This paper will provide an overview of the fiber stress derivation that was used to reevaluate the snsi data.
A derivation of fiber stress values based on a combined data set of the ASTM distribution and EPRI transmission full-scale pole tests resulted in some changes in the standard. 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.
PLS-POLE ANSI Wood Pole Component Files
Since all designs are based on the minimum dimensions, the design fiber stress value is multiplied by the oversize factor to account for the actual average oversize.
Should xnsi need to use one of these three materials you must determine the correct properties for your jurisdictions and incorporate them into their library. Your Alert Profile lists the documents that will be monitored. If the maximum stress point is above ground, adjust the fiber stress per the height adjustment andi and use the minimum 05. at that height. Power Line Systems, Inc. You can download and open this file to your own computer but DRM prevents opening this file on another computer, including a ansk server.
As the voice of the U. These strength reduction factors will not be used on poles 55 feet and shorter as per Annex A. 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 MOR will increase above groundline due to drying to equilibrium conditions as compared to test results of green poles. Strength Of MaterialsMathematicsNature.
The resulting projected fiber stress values at the groundline varied compared ansj the observed groundline stress due to actual pole geometry. No adjustment for variability 3. We are a non-profit group that run this website to share documents.
It is up to the engineer to determine what final density to use based on the treatment and other factors. Please copy and paste this embed script to where you want to embed Embed Script. As the load point is applied at lower heights, the maximum stress point moves lower on the pole. We need your help! 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.
005.1 In some cases, the projected values were higher than the observed and in other cases lower. Need more than one copy? 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.
Applying the formula in Annex A in reverse to project a groundline stress from a known stress above ground is not how the formula was intended to be applied.
We have no amendments or corrections for this standard. One other result of this 005.1 was the confirmation that pole capacity on taller poles changes depending on the height of the applied loads.
This is the true material property.
The following factors adjusted the test data to account for the effects of conditioning during the treatment process. These calculated pole capacities show a good correlation with the test data. Therefore, the test data needed to be adjusted to account for the effects of conditioning so that expected strength correlates with the test data.
MAT below does not include these three pole properties. This value is the fiber stress that was occurring at the groundline when the pole broke at a location above ground. The formula in Annex A was originally developed to account for a reduction in fiber stress at locations in the pole above ground. Please help us to share our service with your friends. There is still some disagreement on the committee about some aspects of the derivation. Subscription pricing is determined by: 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 The poles described herein are considered as simple cantilever members subject to transverse loads only.
This results in Douglas Fir poles having a density of 56 to 65 pcf, depending on the treatment process. The results of this work will be published in future documents.
ANSI O Wood Pole Specification Update – Free Download PDF
Already Subscribed to this document. Thank you for interesting in our services. Therefore, a designer can calculate pole capacity safely and without pole actual dimensions. However, consensus agreement was reached for the standard because the resulting designs are conservative in the vast majority of pole sizes. If the document is revised or amended, you will be notified by email.
The fiber anssi is greater and the circumference is larger at the lower points on the pole so the ultimate pole capacity increases. The factor varies for species and between different classes. Since the Table 1 051. 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.
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