详情

Field Testing and Long-Term Monitoring of Selected High-Mast Lighting Towers

项目名称：	Field Testing and Long-Term Monitoring of Selected High-Mast Lighting Towers
摘要：	In 2013, WYDOT Projects B139025 and B133026 installed a combined 21 high-mast light towers (HMLT) in District 1 and District 3. The HMLTs were fabricated by Valmont Industries according to WYDOT Standard Plan and were installed by Modern Electric of Casper, WY. In May 2016, after only three years of service, inspectors discovered fatigue cracks on two HMLTs located at the Wagonhound Rest Area of of I-80 near Exit 267. One of the HMLTs was missing a luminaire. Further inspection revealed that one more HMLT (also located at the Wagonhound Rest Area) had significant fatigue damage too. Weather data collected by a nearby weather station was reviewed by WYDOT officials showing high winds, rain and freezing temperatures. The cause of the fatigue cracking cannot be determined at this time. Monitoring has been on-going at the selected locations for several months. Based on review of the data, one, and possibly two significant events have been observed at the Dwyer Junction site. The first occurred in April 2018, with very high stress ranges being observed. The ice sensor indicated the presence of ice during the event. The second event, in October of 2019 at the same location also occurred during a period when the sensors indicated icing on the pole. The measured stress ranges were not as high as the April 2018 event, but were still significant. To increase the likelihood of recording additional an events to better characterize the conditions under which such events are produced, it is proposed to extend the monitoring for an additional 18 months beyond the end date of March 2020. This proposal summarizes this work.
状态：	Active
资金：	68553
资助组织：	Wyoming Department of Transportation
项目负责人：	Ahmed, Mohamed
执行机构：	University of Wyoming, Laramie
开始时间：	20200729
预计完成日期：	20221029
主题领域：	Bridges and other structures；Design；Highways；Maintenance and Preservation；Safety and Human Factors