Investigation of pile setup (freeze) in Alabama : development of a setup prediction method and implementation into LRFD driven pile design.
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2015-06-01
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Abstract:The Alabama Department of Transportation (ALDOT) often uses deep foundations
consisting of driven piles, particularly in the southern half of the state, to support bridges or other
highway structures. In the fiscal year 2012, a total of 22 bridges were let to contract by the
ALDOT for a sum of about $37 million (ALDOT 2012). Bullock (1999) reported that the cost of
a deep foundation for some bridges can be about 30% of the overall cost and thus a reduction in
cost could produce a substantial savings to the entire project and passed on to the taxpayers.
ALDOT is interested in investigating the potential of including a phenomenon called pile
setup into the design procedures of driven piles to provide a more efficient and cost-effective
product that provides the same level of safety. ALDOT is currently transitioning from ASD
design methods to LRFD design methods, as mandated by the Federal Highway Administration
(FHWA).
This funded research is tasked with three main topics of investigation. The first is to
identify the pile setup potential of the driven piles installed within the soils of the state of
Alabama. This task requires the organization and analysis of historical records of design and
installed pile load tests. The second task is to incorporate these historical records into the
calibration of statistically determined resistance factors for LRFD design methods. The third
task is to install four typical driven pile types into the soil of a planned bridge location to
investigate the amount of pile setup as well as the propagation of vibrations to surrounding
locations during the installation of the piles. The third task was added as an addendum to the
project, and the vibration report was completed and attached to the end of this report.
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