Wind Speed
Written by Cody Yakimoff
Updated at November 30th, 2022
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- M(z,cat) Gust Wind Speed Multiplier
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- Using Libraries
- Using and updating libraries
- The Constructions (Assemblies) library
- The Constructions and Components Library
- Example Constructions and Components
- No cable constructions
- Creep Modelling
- Video: Editing Pole Top Constructions
- Video: Editing Pole Top Construction components
- Pole Library: Derive Modulus of Rupture From Tipload
- How do I create a new construction?
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- Using Environments
- Overhead
- Poles
- Placing poles
- Adding a stay/guy wire to a pole
- Using precision relative placement to place poles relative to other objects
- Extracting & fitting poles to LiDAR and working with imagery tiles
- Using the Snap tool to fine tune the fit of poles & conductors to LiDAR data
- Analysing the impact of single & multiple stays on a pole
- Viewing detailed tip load results in the Tip Load panel
- Classify spans and poles to be existing, new, replaced, re-tensioned, or removed
- Video: Using the precision placement tool
- Video: Editing Pole Top Constructions
- Video: Editing Pole Top Construction components
- Overview Limit State Table
- Resultant Forces Graph
- Detailed Forces table
- Creating mid-span Poles
- Setting a manual or calculated custom Pole Strength
- Specifying Pole Lean
- Pole stiffness multiplier widget
- Conductors
- Using the Conductor tool to place & configure conductor spans
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- Using the Snap tool to fine tune the fit of poles & conductors to LiDAR data
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- Creep Modelling
- Classify spans and poles to be existing, new, replaced, re-tensioned, or removed
- Video: Using the NESC Ground Clearance tool
- Video: Creating Multiple Conductor Groups
- Video: View and export profiles of overhead line models
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- Creating mid-span Poles
- How do I specify a precise span length?
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- How do I find the blowout of a span?
- Defining Bimetallic Conductors
- Analysing Bimetallic Cables
- Stays / Guys
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- Overview of crossarm parameters
- Crossarm parameter: Second Moment of Area
- Crossarm parameter: Torsion Constant
- Crossarm parameter: Section Modulus
- Crossarm parameter: Material
- Crossarm parameters: Length, width, depth
- Crossarm parameter: Mass
- Crossarm parameter: Maximum Bending Moment
- Crossarm parameter: Max Bending Moment vs Horizontal/Vertical
- Crossarm parameter: Material Strength
- How do I create a double cross-arm?
- Obstructions and structures
- Structural analysis
- Wind analysis
- Finite Element Analysis (FEA)
- Analysing the impact of single & multiple stays on a pole
- Design Setting - Removed Status Stops Loads From Being Applied
- Set up Simulations for use with FEA
- Set up derating strength factors on conductors, poles, and components
- FEA: Unstressed Lengths
- FEA: Deflection and Rotation Angle
- FEA: Load Source
- FEA: Load Factors
- The FEA simulations pipeline
- Static Analysis
- Analysing the impact of single & multiple stays on a pole
- Viewing detailed tip load results in the Tip Load panel
- Design Setting - Removed Status Stops Loads From Being Applied
- Set up derating strength factors on conductors, poles, and components
- Overview Limit State Table
- Resultant Forces Graph
- Detailed Forces table
- Setting a manual or calculated custom Pole Strength
- Calculations
- Example models from AS7000 HB 331-2012
- Sag Measurement
- General Conductor Properties and calculations
- Blowout Calculation
- Tip Load Calculations
- Stay Calculation
- Sag Tension Calculation
- Pole Plant Calculation
- Span Clearance Calculations
- Catenary Definition
- Torsion Constant
- Neutral Axis
- Moments of Area
- Second Moment of Area
- Section Modulus
- Maximum Bending Moment
- Modulus of Elasticity
- Stress / Strain
- Maximum Bending Stress / Material Strength
- Common Shapes: Second Moment of Area and Torsion Constant
- Underground
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- Extracting & fitting poles to LiDAR and working with imagery tiles
- Using the Snap tool to fine tune the fit of poles & conductors to LiDAR data
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Table of Contents
General Theory
Typically the wind pressure will have the largest impact on the loads applied to a structure. Hence when selecting and applying a design wind pressure the process is often more complicated than just selecting a single wind pressure and using it everywhere.
Within Neara the wind pressure is calculated using the formula. Note that the air density is not currently taken into account.
Generally there are a few steps to calculating the wind pressure on a structure or conductor.
- Calculate the overall design wind pressure for a region
- This could take into account things like geographical region, design life, required reliability
- Calculate the site specific wind pressure for each structure
- This will typically take into things like terrain category, height of conductors above ground, any topographical features such as exposed structures on the edge of hills
- Calculate the span lengths to apply the wind pressure
- This could take into account the inertia of the line such as a gust response factor or a span reduction factor
- Account for any drag factors on the different object types
- Different factors will be often used for conductors, poles based on shape, cross arms etc
Wind Codes Implemented
Current only the Australia/New Zealand wind code standards have been implemented within Neara. In the future other wind codes will be added.