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Lateral Analysis Guidelines for Drilled Shafts in Nevada Based on LRFD Framework
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2022-07-01
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[PDF-3.78 MB]
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Edition:Final Report December 2017 to July 2022
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Abstract:The major goal of this research is to improve the conventional p-y analysis in the context of larger diameter drilled shafts. The conservative lateral response due to the absence of lateral resistance components in p-y analysis for larger diameter shafts has been termed as ‘diameter effect’ in past research. To apply and evaluate the proposed unified p-y analysis, a MATLAB-based, finite-difference program, NVShaft, has been developed. During the initial development stage, NVShaft was verified by comparing the predicted responses with classical p-y solutions and responses obtained from available commercial programs. To evaluate NVShaft, and the unified p-y method, available literature on lateral load tests on larger diameter shafts was explored. The following load test programs were considered to validate the numerical p-y analysis in NVShaft: 1) Las Vegas load test program, 2) Incheon Bridge cyclic lateral load test, 3) PISA load test program, 4) University of California, San Diego load test, 5) University of Florida centrifuge test and 6) Raiders Stadium load test. To perform these validation exercises, the p-y soil models were computed based on interpreted soil characteristics from relevant load test reports. No calibrations of the p-y models were attempted in this regard. It was found that shorter embedment depth and larger axial load significantly increase the tip resistances in the p-y model. A user manual for NVShaft and the outline of the three methods to perform lateral stability analysis in NVShaft have been included in this report as well.
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