Monitoring Wind-Induced Vibrations/Stresses in a High Mast Lighting Tower

Project Details
STATUS

Completed

PROJECT NUMBER

TR-518

START DATE

07/01/04

END DATE

12/31/05

RESEARCH CENTERS InTrans, BEC, CTRE
SPONSORS

Iowa Department of Transportation
Iowa Highway Research Board
Robert Dexter & Subconsultants

Researchers
Principal Investigator
Terry Wipf

Faculty Affiliate

Co-Principal Investigator
Brent Phares

Bridge Research Engineer, BEC

Student Researcher(s)
Byung-Ik Chang

About the research

The objective of this research was to collect long-term behavior information on the performance of one of the eight high-mast lighting towers in the I-35/US 18 interchange near Clear Lake, Iowa for the purpose of validating assumptions made by others in an analytical investigation of these and similar towers. The research consist of three primary tasks. Task 1 was to design the long-term monitoring system needed to collect the required information. This system includee strain sensors, vibration sensors, wind speed sensors, and video recording equipment. The system was designed such that data can be collected and transmitted remotely to all interested parties. Task 2 was to install and maintain the above system for a year. Task 3 was to determine the natural frequencies and damping characteristics of about nine towers. This was accomplished by installing a sensor on the towers and then vibrating the pole manually.

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