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Abstract:Maintaining traffic flow for bridge widening and replacement projects often requires bridges to be constructed in phases so that traffic can travel on one
portion of the bridge while another portion is being
constructed. The bridge portions are then connected
with cross frames and deck closure pours. The adjacent deck elevations of the phases must align along
the length of the bridge so the resulting driving suface is smooth, uniform and durable. Although they
can perform satisfactorily, phase-constructed steel
I-girder bridges have presented some challenges.
Differing finish grade elevations in
the closure region, which close the
gaps between the phases, can occur
due to camber tolerances and differences between predicted and actual
dead load deflections. The misalignment can also be due to sources such
as creep and shrinkage deflections
because the phases are constructed
independently at different times.
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