United States Department of Transportation
i
Field Testing and Long-Term Monitoring of Selected High-Mast Lighting Towers (Phase 2)
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2023-02-01
[PDF-7.18 MB]
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Edition:Final Report
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Abstract:Phase 2 monitoring was carried out continuously for an additional 18 months. Identical to Phase 1, Phase 2 instrumentation included an ice sensor, anemometer for wind speed and direction, thermocouple for temperature, and strain gages. In this way, the research team was able to determine what the structural response to the large-amplitude events were and if a build-up of ice could be correlated to its occurrence. Two large-amplitude events were recorded during the period of Phase 2 field monitoring. Extreme stress ranges were observed during both events, reaching peak stresses of about 28.5 ksi (ranges of up to 57 ksi) and lasting a few minutes. The extreme events were found to be relatively rare and unpredictable in terms of when they might occur.
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