Seismic Behavior of Helical Piles in Dense Sands

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Description

Helical piles are being used in seismic regions of the U.S. and other countries, yet there remains much confusion regarding the state of practice and building codes for this pile type. Nonetheless, it is anticipated that piles with comparatively small cross-sections and high anchoring capacity, such as helical piles, could be beneficial for seismic resistance due to their slenderness, higher damping ratios, ductility, and resistance to tip uplift. In addition, helical piles can be easily implemented as a retrofitting solution for foundations that are found to be deficient according to updated seismic codes. Existing seismic testing results, including results from the premier seismic testing research program on helical piles in sand on the University of California- San Diego outdoor shake table, and current design standards are analyzed to make recommendations about how to fill the knowledge gaps and provide quantitative data on the behavior of helical piles under seismic conditions.

Course will award 1.5 hours of continuing education
Diamond Review approved in all 50 states
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Contributors

Amy B. Cerato, Ph.D., P.E.

Cerato is the Rapp Foundation Presidential Professor of Civil Engineering at the University of Oklahoma. She researches and consults in geotechnical engineering, specifically focusing on soil stabilization, expansive soil mitigation and foundation design in problematic soils. She is a registered professional engineer in Oklahoma. She is the author of more than 50 technical papers and the recipient of the 2009 Presidential Early Career Award for Scientists and Engineers (PECASE) and 2008 National Science Foundation CAREER award. She is a member of the DFI Helical Pile and Tiebacks Committee and the ASCE Geo-Institute Committee of Engineering Geology and Site Characterization.

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Description

Contributors

Amy B. Cerato, Ph.D., P.E.