Category: CHECKWIND

CHECKWIND v4.6.0 released

CHECKWIND v4.6.0 is now live and can be downloaded here. New features and enhancements include:

  • Reset site location parameters.
  • AS 4055: Option to enable/disable upwind topographic shielding for Topography Class calculation.
  • AS/NZS 1170: Option to enable/disable upwind topographic shielding for Topographic Multiplier (Mt) calculation.
  • AS/NZS 1170: Select between frame and cladding elements for external and local pressures.

CHECKWIND v4.5.0 released

CHECKWIND v4.5.0 is now live and can be downloaded here. New features and enhancements include:

  • Select Design Reference before entering site location.
  • AS 4055: Improvements to Topographic Class calculation including criteria for shielding provided by significant upwind features.
  • AS/NZS 1170: Improvements to Topographic Multiplier (Mt) calculation including criteria for shielding provided by significant upwind features.
  • ASCE 7-10/ASCE 7-16/TIA-222-G/TIA-222-H: Improvements to Topographic Multiplier (Kzt) calculation.

CHECKWIND v4.4.0 released

CHECKWIND v4.4.0 is now live and can be downloaded here. New features and enhancements include:

  • Significant speed improvements using multithreading.
  • AS/NZS 1170: Improvements to Terrain Category detection for New Zealand sites.
  • ASCE 7-10/ASCE 7-16/TIA-222-G/TIA-222-H: Improvements to Exposure Category detection.
  • TIA-222-G/TIA-222-H: Introduction of Average Elevation methodology for Topography Factor (Kzt) calculation.

CHECKWIND v4.3.0 released

CHECKWIND v4.3.0 is now live and can be downloaded here. New features and enhancements include:

  • Significant speed improvements when importing topography data.
  • Significant speed improvements when assembling map imagery.

CHECKWIND v4.2.0 released

CHECKWIND v4.2.0 is now live and can be downloaded here. New features and enhancements include:

  • Google map imagery automatically compared against Land Cover Database for sites in New Zealand.
  • AS 4055: Significant improvements to automatic Terrain Category detection.
  • AS 4055: Significant improvements to automatic Shielding Class detection.
  • AS 4055: Improvements to automatic Topography Class calculation.
  • AS/NZS 1170: Significant improvements to automatic Terrain/Height Multiplier (Mz,cat) detection.
  • AS/NZS 1170: Significant improvements to automatic shielding structure (Ms) detection.
  • AS/NZS 1170: Improvements to automatic Topography Multiplier (Mt) calculation.
  • ASCE 7-10/ASCE 7-16/TIA-222-G/TIA-222-H: Significant improvements to automatic Velocity Pressure Coefficient (Kz) detection.
  • ASCE 7-10/ASCE 7-16/TIA-222-G/TIA-222-H: Improvements to automatic Topography Factor (Kzt) calculation.
  • ASCE 7-10/ASCE 7-16/TIA-222-G/TIA-222-H: Upwind shielding sector plotted for Topography Factor (Kzt).
  • AS/NZS 1170: Option to use Parapet Height (hp) value for all locations and wind directions simultaneously.
  • Users can now specify a negative water surface level.

CHECKWIND v4.1.0 released

CHECKWIND v4.1.0 is now live and can be downloaded here. New features and enhancements include:

  • Updates to the Terrain Category (Mz,cat), Shielding Structures (Ms) and Exposure Category (Kz) detection algorithms to account for recent changes to Google’s map data format.
  • AS 4055: Override Shielding Classification to account for future developments and heavily wooded areas.
  • ASCE 7-10/ASCE 7-16/TIA-222-G/TIA-222-H: Updated ice wind speed maps for Puerto Rico, U.S. Virgin Islands, Guam and American Samoa.
  • ASCE 7-10/ASCE 7-16/TIA-222-G/TIA-222-H: Improved automatic Topography Factor (Kzt) calculation including an option to adopt Crown Castle reference ENG-PRC-10040 design methodology.
  • TIA-222-G/TIA-222-H: View average upwind terrain level in Topography Factor (Kzt) review dialog.

CHECKWIND v4.0.0 released

CHECKWIND v4.0.0 is now live and can be downloaded here. New features and enhancements include:

  • Choose between metric (mm, m, km, m², m/s, kPa) and imperial (in, ft, mi, ft², mph, psf) measurement units.
  • AS 4055: Automatic Wind Region detection.
  • AS 4055: Automatic Terrain Category detection.
  • AS 4055: Automatic Topographic Class detection.
  • AS 4055: Automatic Shielding Class detection.
  • AS/NZS 1170: Internal and net pressure calculation for building loads.

CHECKWIND v3.1.0 released

CHECKWIND v3.1.0 is now live and can be downloaded here. New features and enhancements include:

  • AS/NZS 1170: Topographic feature midpoints (Lu) are now determined using interpolation, leading to more accurate site Topographic Multipliers (Mt).
  • ASCE 7-10/ASCE 7-16/TIA-222-G/TIA-222-H: Topographic feature midpoints (Lh) are now determined using interpolation, leading to more accurate site Topographic Factors (Kzt).
  • Define water level for topography detection near inland lakes and rivers with surface levels above mean sea level.

CHECKWIND v3.0.0 released

CHECKWIND v3.0.0 is now live and can be downloaded here. New features and enhancements include:

  • Now optimised as a 64-bit application (no more pesky System.OutOfMemoryException errors).
  • New automated Topographic Multiplier (Mt) detection algorithm to AS/NZS 1170 (more on that below).
  • Users can now override Topographic Multiplier (Mt) values.
  • Introduction of our own Basic Wind Speed maps to ASCE 7-10, ASCE 7-16, TIA-222-G and TIA-222-H.
  • Improvements to automated Exposure Category (Kz) detection to ASCE 7-10, ASCE 7-16, TIA-222-G and TIA-222-H.
  • New automated Topographic Factor (Kzt) detection algorithm to ASCE 7-10, ASCE 7-16, TIA-222-G and TIA-222-H based on Crown Castle and SEAW RSM-03 guidelines.

Topographic Multiplier (Mt) Detection Improvements

Until now, CHECKWIND has used a combination of the 500 m segment criteria from the AS/NZS 1170.2 commentary (though with a “rolling” 500 m segment instead of less accurate 500 m increments from the crest suggested by AS/NZS 1170.2), in addition to our own local minimum criteria to determine the base of a feature.

Figure 1: AS/NZS 1170.2 C4.4.2

However, the problem with utilising the local minimum criteria is that the base might be determined as being at the bottom of a valley with a steep slope for certain terrain, leading to overly conservative Mt values, as shown in Figure 2.

Figure 2: CHECKWIND v2.2.1 results

The local minimum criteria was intended to avoid situations where the 500 m segment might identify the “base” as being halfway up/down a slope, which seemed counter intuitive. Regardless, we’ve adjusted the algorithm and removed the local minimum criteria and now rely solely on the 500 m segment method. This has led to an overall reduction in Mt values across all of our test sites, as shown in Figure 3.

Figure 3: CHECKWIND v3.0.0 results

CHECKWIND v2.2.0 released

CHECKWIND v2.2.0 is now live and can be downloaded here. New features and enhancements include:

  • Simplification of building structure inputs – “h” now represents the average roof height. CHECKWIND data files created using previous versions will calculate this value automatically.
  • View building footprint overlay by holding mouse button down on map before setting location by double-clicking.
  • Improved Design Reference detection.
  • Licencing improvements.