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Embedment depth for utility services poles according to AustralianStandard 4676Written By: Lexatus - Oct 1313

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When dealing with methods for proportioning footings and poles, an useful reference is the AustralianStandard 4676, titled Structural design requirements for utility services poles.For direct-planted poles, hence not on square pads, the Engineer can make some reasonable assumptionson the location of the centre of rotation of the footing and the vertical distribution of bearing stress in thefoundation material.

In order to define the embedment depth D, the following assumptions are considered:

- The centre of rotation of the footing as located at two thirds of embedment depth below groundsurface;

- The vertical distribution of bearing pressure above the centre of rotation is in the form ofsymmetrical parabola with its axis of symmetry located at one third of the embedment depth below theground surface with its maximum value taken as 1.5 fb; and

- The vertical distribution of the bearing pressure below the centre of rotation is a skewed parabola

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for which the resultant horizontal reaction force is located at eight ninths of the embedment depth belowground level.

Based on the above assumptions, we can calculate the embedment depth (D) from the following equation:

C is the resistance of the foundation. Its value is:

- fbu x b for ultimate limit state;

- fb x b for serviceability limit state.

Where:

- fb = the nominal maximum bearing strength of the foundation material (kPa);

- fbu = 1.5 fb (this means that the ultimate value is given by the serviceability one increased by 50%);

- b = the effective width of the footing, projected on a plane perpendicular to the direction of the resultanthorizontal force acting on the pole (m);

- M = the overtuning moment acting on the pole at ground level (kNm);

The overtuning moment is given by:

HR x ht, where:

- HR = the resultant of the horizontal forces acting on the pole (kN);

- ht = the height above ground level at which HR acts (m).

For any issues or questions, you can contact the author at:

[email protected]

Eng. Onorio Francesco Salvatore

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Posted in Australia, Codes issues, Geotechnics , AS 4676, Australia, Australian Standard, direct-plantedpole, embedment, Eng. Onorio, foundation, foundation resistance, Onorio, Onorio Francesco Salvatore,Overtuning moment, Serviceability Limit State, Structural design, structural engineering, Ultimate LimitState, utility services poles | No Comments You can follow any responses to this entry through the RSS 2.0 feed. You can leave a response, ortrackback from your own site.

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