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 is the true material property. No adjustment for load sharing 2. A Working Group has been formed within the Fiber Stress Subcommittee to determine if there is strong evidence for changes that might result in less asni or more precise designs. The fiber stress is greater and the circumference is larger at the lower points on the pole so the ultimate pole capacity increases.
Please copy and paste this embed script to where you want to embed Embed Script. Standards Subsctiption may be the perfect solution. In some cases, the projected values were higher than the observed and in other cases lower.
The observed groundline stress is another value that comes into play when a pole breaks above the groundline during a test. Please fill this form, we will try to respond as soon as possible. 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 ansii.
This standard is also available in these packages:. Strength Of MaterialsMathematicsNature. We strongly suggest that Annex A be read and understood before designing a wood pole structure under this standard.
It is up to the engineer anis determine what final density to use based on the treatment and other factors. The resulting projected fiber stress values at the groundline varied compared to the observed groundline stress due to actual pole geometry.
ANSI O5.1 Wood Pole Specification Update
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You can download and open this file to your own computer but DRM prevents opening this file on another computer, including a networked server. Subscription pricing is determined by: The factor varies for species and between different classes.
Your Alert Profile lists the documents that will be monitored. The formula in Annex A was originally developed to account for a reduction in fiber stress at locations in the pole above ground. We 50.1 also provided a complete file ansi.
This standard provides minimum specifications for the quality and dimensions of wood poles that are to be used as single-pole utility structures. 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. 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.
Proceed to Checkout Continue Shopping. The fiber stress values needed to be re-evaluated based on consideration of the additional test data.
The poles described herein are considered as simple cantilever members subject to transverse loads only. 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. The results of this work will be published in future documents. No test data from small clears All data combined for this derivation was from full-scale tests of green, untreated poles. Class Oversize Adjustment The class oversize is applied to the actual measured MOR calculated from the actual dimensions.
No adjustment for variability 3. Size px x x x x However, consensus agreement was reached for the standard because the resulting designs are conservative in the vast majority of pole sizes.
ANSI O – Wood Poles – Specifications and Dimensions
The MOR will increase above groundline due to drying to equilibrium conditions as compared to test results of green poles. Please help us to share our service with your friends. This standard is also available to be included in Standards Subscriptions.
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 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.
We have no amendments or corrections for this standard. Not only does the actual species of wood vary, but the moisture content, drying process, and treatment are all factors that can result in large density variations.
Since the Table wnsi 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.