Evaluation of static resistance of deep foundation [project summary].
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2017-06-01
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Abstract:Various types of deep foundations were investigated including steel H-piles, pre-stressed concrete piles, open cylindrical steel and concrete piles with diameters greater than 36 inches, and drilled shafts with partial length permanent casing.
The researchers collected a substantial amount of field data to use in evaluating FB-Deep’s performance. Field data collection included standard penetration tests as well as static and dynamic load test results. Dynamic test data included many set-check records and a signal match analysis; from these, reasonable estimates of long-term static resistance were obtained. In addition to this testing, the researchers collected all available information for the subject sites and relevant pile types from local agencies, consultants, other state departments of transportation (DOTs), and the Federal Highway Administration database.
The researchers also studied unit skin friction versus deformation curves for cased drilled shafts embedded in Florida limestone. Data sources included a Florida Department of Transportation (FDOT) database, other FDOT research projects, and other state DOTs, among others.
Data related to pile performance, such as unit skin resistance and end bearing, were evaluated for a variety of soil and rock types, as appropriate to the pile type’s intended use. The analysis of the extensive body of data collected in the project was used to recommend revisions to the FB-Deep software. The Bridge Software Institute implemented updated code to reflect the required revisions and provided validation examples to ensure stability of the analysis.
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