ISFOG 2020 Webinar: New proposed ISO/API unified CPT-based method for axial pile capacity in sand

Опубликовано: 11 Март 2025
на канале: Geo-Institute of ASCE

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Speakers: Farrokh Nadim, Technical director, Norwegian Geotechnical Institute & Barry Lehane of UWA

Until about a decade ago, the axial capacity of tubular steel piles for offshore installations was primarily based on the American Petroleum Institute (API) Recommended Practice. This talk will discuss the theoretical basis of the new Unified CPT-based method developed through a Joint-Industry Project (JIP) by NGI and UWA to estimate the axial capacity of piles in sand.
This new Unified CPT-based method will be implemented in the main text of the upcoming update to the design code ISO 19901-4 and was calibrated with the unified database of pile load tests recently developed by Lehane et al. (2017). It incorporates key factors known to influence pile capacity, including a) the degree of soil displacement (plugging) during installation, b) friction fatigue, c) sand-pile interface friction angle, d) changes in radial stress during loading and e) the influence of loading direction.

The new method provides more reliable predictions of the capacities of the pile load tests in the Unified database than any of the existing axial pile capacity design methods in the current API and ISO guidelines.

The International Symposium on Frontiers in Offshore Geotechnics will be held Aug 28-31, 2022, in Austin, TX. For more information, visit http://www.isfog2020.org.

The Geo-Institute is a technical society with about 12,000 geotechnical engineers and geologists as members. Find out more or join at http://www.geoinstitute.org.

The Deep Foundations Institute is an international association of contractors, engineers, manufacturers, suppliers, academics and owners in the deep foundations industry. Find out more or join at http://www.dfi.org.