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Investigation of Anchor Nut Loosening in High-Mast Light Poles Using Field Monitoring and Finite Element Analysis. Final Project Report
| 题名： | Investigation of Anchor Nut Loosening in High-Mast Light Poles Using Field Monitoring and Finite Element Analysis. Final Project Report |
| 作者： | Hoisington, D.; Hamel, S. |
| 关键词： | Light poles##Anchors(Fasteners)##Investigations##Highway maintenance##Alaska##Bolts##Finite element method##Foundations##Intersections##Monitoring##Rods##High mast lighting poles(HMLPs)##Anchor nut loosening##Anchorage(Alaska)## |
| 摘要： | High mast lighting poles (HMLPs) are cost effective structures for lighting highways and intersections. They are 100 to 250 feet (30m to 76m) tall, and can hold a variety of lamp configurations. They are commonly used at highway interchanges because a single unit effectively covers more area than the typical, approximately 30 foot (10m) tall, light poles. The AKDOT&PF maintains 104 such poles in the greater Anchorage area. One issue that has been observed by the Alaska Department of Transportation and Public Facilities (AKDOT&PF) with HMLPs is anchor nut loosening. Anchor rods and their associated nuts are used to secure the HMLP base plate to the poles foundation. When theyre tight, they allow the rods to transfer load from the HMLP to the foundation. The anchor nuts have been loosening on many HMLPs regardless of foundation type, pole height, lamp configuration, date of installation, number of anchor rods, rod diameter, or temperature during the time of installation. Any poles that have loose nuts undergo a re- tightening procedure outlined by the American Association of Highway Transportation Officials (AASHTO). From 2007-2011, 177 inspections were done on 104 poles. 54 of these inspections revealed loose anchor nuts. This program is too costly for the Department to continue indefinitely. The need for solutions for existing and yet to be installed poles is evident. |
| 总页数： | 159 |
| 报告类型： | 科技报告 |
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