United States Department of Transportation
i
Field demonstration of new bridge approach slab designs and performance : [tech summary].
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2014-06-01
[PDF-114.75 KB]
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Abstract:The Louisiana Department of Transportation and Development (DOTD) has launched a major eff ort to solve
the bridge bump problem by changing the design of approach slabs where diff erential settlement is expected.
The objective is to fi nd a feasible solution that makes the approach slabs strong enough to allow them to lose a
portion or all of their contact supports without detrimental defl ection. In this solution, the fl exural rigidity (EI)
of the approach slabs will be increased by increasing the slab thickness and reinforcement, and therefore some
embankment settlement will be allowed without a decrease in ride quality. As a result, the slab and traffi c loads
will be carried by the two ends of the slab (simply supported) rather than being distributed over the length of
the slab. Accordingly, a footing will be needed to support the concentrated load at the R/S joint. To increase the
bearing capacity of embankment soil and to reduce the footing settlement due to concentration load, the soil
underneath the footing needs to be reinforced with geosynthetic reinforcement,
such as geogrids.
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