CHECKPOLE v5.4.0 is now live and can be downloaded here. New features and enhancements include:
- Existing custom monopole libraries created in v5.0.0 onwards will automatically be converted to the new format.
- Rocla monopole library has been updated to include openings, superceded poles and recent changes to SR poles with 8M24 tip ferrules.
CHECKPOLE v5.2.0 is now live and can be downloaded here. New features and enhancements include:
- AS/NZS 1170: Improvements to Topographic Multiplier (Mt) calculation.
- TIA-222-G/TIA-222-H: Improvements to Topographic Factor (Kzt) calculation.
- Define water level for topography detection near inland lakes and rivers with surface levels above mean sea level.
CHECKPOLE v5.1.0 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).
- Monopole openings can now be viewed in section and elevation.
- Improvements to Type 4 opening reinforcement.
- 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 TIA-222-G and TIA-222-H.
- Improvements to automated Exposure Category (Kz) detection to TIA-222-G and TIA-222-H.
- New automated Topographic Factor (Kzt) detection algorithm to TIA-222-G and TIA-222-H based on Crown Castle and SEAW RSM-03 guidelines.
- Improvements to fatigue design to AASHTO 2013.
Topographic Multiplier (Mt) Detection Improvements
Until now, CHECKPOLE 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: CHECKPOLE v5.0.7 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: CHECKPOLE v5.1.0 results