Composite pole parameters can be found in the Composite poles tab of the Poles library.
There are two broad categories of composite poles, Fibre Reinforced Polymer (FRP) and Fiberglass Reinforced Concrete (FRC). Neara's composite poles functionality is specifically designed for FRP poles and limited to single tube only.
Depending on the materials used in an FRP pole the ambient temperature can change the physical properties of an FRP pole including strength, elasticity and length. Neara allows variance of the the strength and elasticity based on ambient temperature while the length is assumed fixed.
General
The general section contains both read only and writable fields.
Field Name | Description |
Name | User entered name of the pole. |
Length | Read only length of the pole (it is set in the Tubes section) |
Material | Read only - automatically set to |
Default Sink Depth | Default embedment depth pole will be installed at |
Mass | Read only - calculated based on geometry and the density data |
Density | Density of the material |
Drag Coefficient | Drag coefficient used in wind calculations used to account for pole resistance to wind |
Price | Price field used for cost estimates |
Tags | Tags used for different strength reduction factors |
Note, pole thickness is controlled in the Tubes section alongside length.
Pole Shape
Field Name | Description |
Shape | Read only - automatically set to |
Tip Diameter | Diameter at the tip of the pole
|
Bottom Diameter | Diameter of the base of the pole
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Taper | Percentage taper is the % increase in diameter per unit length (e.g. 1% taper over 1000mm would be an increase in diameter of 10mm)
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Pole Strength
The pole strength has two ways of being defined
Independent of the ambient temperature, or
Dependant on the ambient temperature which is controlled by the check box Per Tube Polynomial Strength.
If this checkbox is selected then extra fields will appear in the tubes table that contain the failure stress coefficients
P.Str. K0,P.Str. K1,P.Str. K2(wherePstands for Pole andStrstands for Strength).
The failure stress is then calculated using the following formula:
If the Per Tube Polynomial Strength is unchecked then the Failure Stress (Modulus of Rupture) can be directly entered as either a Breaking Tip Load or a Modulus of Rupture. Defining one of these parameters will automatically derive the other. For more information about this calculation, see Derive MoR from Tip Load.
Field Name | Description |
Breaking Tip Load | The equivalent breaking tip load of the pole
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Derive MoR from Tip Load | This controls if the Breaking Tip Load or Modulus Of Rupture is the master data or derived data
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Modulus Of Rupture | The maximum stress a material can withstand before fracturing or yielding
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Pole Elasticity
The pole elasticity has two ways to define it, it can be either be independent of the ambient temperature or dependant on the ambient temperature which is controlled by the check box Per Tube Polynomial Elasticity. If this checkbox is selected then extra fields will appear in the tubes table that contain the modulus of elasticity coefficients P.Ela. K0, P.Ela. K1, P.Ela. K2 (where P stands for Pole and Ela stands for Elasticity). Note, Poisson's ratio will still be used to calculate the Shear Modulus based on the calculated Modulus of Elasticity for a given Ambient Temperature.
The Modulus of Elasticity is then calculated using this formula:
If the Per Tube Polynomial Elasticity is unchecked then the Modulus of Elasticity can be directly entered and will be independent of ambient temperature. For more information, see Pole Elasticity, Shear Modulus and Poisson's Ratio.
Tubes
This section controls the single allowable tube of the composite pole. The pole's Thickness and Length are set in this section.
