TY - CONF
T1 - Assessing the wind-induced response of High-Mast Illumination Poles (HMIPs) using field data
AU - Chen, Y. C.
AU - Manuel, L.
AU - Morovat, M. A.
AU - Zuo, D.
N1 - Funding Information:
The authors gratefully acknowledge the funding received from the Texas Department of Transportation (TxDOT) for Project 0-6829: Fatigue Resistance and Reliability of High Mast Illumination Poles (HMIPs) with Pre-Existing Cracks. They also acknowledge discussions with other researchers (Drs. Michael Engelhardt, Todd Helwig, Patricia Clayton, and Eric Williamson) at Ferguson Structural Engineering Laboratory (FSEL) who are involved in the fatigue capacity studies of HMIPs that complement the wind load-related studies reported herein.
PY - 2017
Y1 - 2017
N2 - High-Mast Illumination Poles (HMIPs) are commonly used to provide lighting along highways and at interchanges. HMIPs are tapered steel poles fabricated in sections with heights sometimes exceeding 50 meters. In recent years, collapses of HMIPs have been reported in the United States. These collapses have been attributed, in part, to fatigue-induced damage at the HMIP shaft-to-base plate connection. In order to better understand the fatigue loading environment at the base of HMIPs, we discuss a field measurement campaign underway that is seeking to characterize associated wind loading regimes and ultimately employ the data in fatigue reliability studies. We are primarily focused on loading that is associated with buffeting and vortex shedding. Various parameters such as the mean wind speed, vertical wind profile, wind direction, and turbulence intensity estimated from the data are used to characterize the wind environment and how it results in different types of HMIP response. Strain gauges installed at the bottom of the HMIP are also used to identify vibration modes and relate response amplitudes to the wind. Stress range distributions at a detail of interest - conditional on 5-minute averaged wind field parameters - are estimated from the field data. Together with uncertainty assessments of fatigue capacity, to be established separately from ongoing laboratory measurements, a framework to assess the reliability against fatigue damage of HMIPs under different wind regimes is developed. While measurements from four HMIPs are being gathered, only data from a site in Austin, Texas are presented here. The presence of pre-existing cracks from a galvanizing process often used with HMIPs and how they influence fatigue life is a separate subject of investigation for which the present study is relevant.
AB - High-Mast Illumination Poles (HMIPs) are commonly used to provide lighting along highways and at interchanges. HMIPs are tapered steel poles fabricated in sections with heights sometimes exceeding 50 meters. In recent years, collapses of HMIPs have been reported in the United States. These collapses have been attributed, in part, to fatigue-induced damage at the HMIP shaft-to-base plate connection. In order to better understand the fatigue loading environment at the base of HMIPs, we discuss a field measurement campaign underway that is seeking to characterize associated wind loading regimes and ultimately employ the data in fatigue reliability studies. We are primarily focused on loading that is associated with buffeting and vortex shedding. Various parameters such as the mean wind speed, vertical wind profile, wind direction, and turbulence intensity estimated from the data are used to characterize the wind environment and how it results in different types of HMIP response. Strain gauges installed at the bottom of the HMIP are also used to identify vibration modes and relate response amplitudes to the wind. Stress range distributions at a detail of interest - conditional on 5-minute averaged wind field parameters - are estimated from the field data. Together with uncertainty assessments of fatigue capacity, to be established separately from ongoing laboratory measurements, a framework to assess the reliability against fatigue damage of HMIPs under different wind regimes is developed. While measurements from four HMIPs are being gathered, only data from a site in Austin, Texas are presented here. The presence of pre-existing cracks from a galvanizing process often used with HMIPs and how they influence fatigue life is a separate subject of investigation for which the present study is relevant.
KW - Buffeting
KW - High-mast illumination poles
KW - Vortex shedding
KW - Wind-induced vibration
UR - http://www.scopus.com/inward/record.url?scp=85029808217&partnerID=8YFLogxK
M3 - Paper
AN - SCOPUS:85029808217
T2 - 2017 13th Americas Conference on Wind Engineering, ACWE 2017
Y2 - 21 May 2017 through 24 May 2017
ER -