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Andover Bridge Rehabilitation
Perth-Andover, NB
Eastern Designers & Company Limited performed value engineering,
preliminary and final designs for the $5M rehabilitation of the 291m
long steel truss structure crossing the Saint John River at
Perth-Andover, NB. The original structure was designed for H20-S16
truck loading. However, due to deterioration of members and increased
thickness of asphalt over the years, the actual Gross Vehicle Weight
capacity was reduced substantially. Technical challenges included
determining how to upgrade the capacity of the bridge to CS600 truck
loading and increasing the height of the structure while maintaining
traffic flow across this critical crossing of the Saint John River. The
rehabilitation included replacement of the deck, replacement of
approximately 100 rusted stringers, upgrading of the existing stringer
and floor beam capacities by welding nelson studs, jacking up the
structure to mitigate ice damage, upgrading the jacking girders,
construction of new bearing pedestals and replacement of bearings.
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