Investigation of Bridge Mounted Light Poles Vibrations,
About the research
Construction on the Burlington cable-stayed bridge across the
Mississippi River began in 1989 and the bridge was completed in 1994.
From west to east the bridge consists of the
following: (1) composite steel plate girder approach spans with exit and
in Iowa, (2) 660-foot and 405-foot cable stayed spans, (3) a suspended
span, and (4)
prestressed concrete beam approach spans in Illinois (Petzold 1995).
poles for roadway lighting were part of the bridge project and were
installed in 1994 by a
subcontractor to the primary contractor, Edward Kraemer and Sons.
Scope and Objective: Recently, attention has been drawn to
failing luminaires on the Burlington Cable Stayed Bridge. Many light
bulbs have failed prior to reaching their expected life. It was
hypothesized that vibrations from vehicular traffic may have caused the
failures. On November 15, 2001, with 10 mph winds and a 60-degree
temperature, several tests were conducted under different load
conditions to study how
traffic affects the light poles. The primary purpose of these tests was
to understand the
relationship between traffic induced vibrations and luminaire behavior