Remedial Action for Failed Pole/Base Plate Weld on High Mast Lighting Pole (HMLP)

摘要

High mast lighting poles (HMLPs) were not designed for fatigue until the codes adopted more detailed procedures in 2001. Although replacement will eliminates HMPLs with fatigue cracks, these cracked poles cannot be immediately replaced as they need to be redesign, bed, and install. Removing the cracked poles is also not a solution as this will affect the lighting in the area, which compromises the visibility and safety of drivers who are travelling at night or during a thunderstorm. Thus, remedial action to temporarily prevent the cracked poles from failing prior to their replacement is needed. In this project, four repair methods have been developed and designed as remedial actions to prevent the fatigue cracks from propagating around the pole. These repair methods consist of (1) reweld of cracks, (2) welded plate stiffeners, (3) bolted stiffeners, and (4) steel jacket encasement. Results of full-scale structural testing indicate that options 2 and 3 present the best solution to temporarily remediate the cracked poles.