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An enhanced interface model for friction fatigue problems of axially loaded piles
Kullolli, Borana; Baeßler, Matthias; Cuéllar, Pablo et al.
2019In Proceedings of the ASME 2019 38th, International Conference on Ocean, Offshore and Arctic Engineering, Glasgow 9-14 June 2019
Peer reviewed
 

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Keywords :
soil-structure interaction; cyclic axially loaded pile; friction fatigue; interface model
Abstract :
[en] The shaft bearing capacity often plays a dominant role for the overall structural behaviour of axially loaded piles in offshore deep foundations. Under cyclic loading, a narrow zone of soil at the pile-soil interface is subject to cyclic shearing solicitations. Thereby, the soil may densify and lead to a decrease of confining stress around the pile due to micro-phenomena such as particle crushing, migration and rearrangement. This reduction of radial stress has a direct impact on the shaft capacity, potentially leading in extreme cases to pile failure. An adequate interface model is needed in order to model this behaviour numerically. Different authors have proposed models that take typical interface phenomena in account such as densification, grain breakage, normal pressure effect and roughness. However, as the models become more complex, a great number of material parameters need to be defined and calibrated. This paper proposes the adoption and transformation of an existing soil bulk model (Pastor- Zienkiewicz) into an interface model. To calibrate the new interface model, the results of an experimental campaign with the ring shear device under cyclic loading conditions are here presented. The constitutive model shows a good capability to reproduce typical features of sand behaviour such as cyclic compaction and dilatancy, which in saturated partially-drained conditions may lead to liquefaction and cyclic mobility phenomena.
Disciplines :
Civil engineering
Author, co-author :
Kullolli, Borana;  Bundesanstalt für Materialforschung und -prüfung Berlin, GERMANY
Baeßler, Matthias;  Bundesanstalt für Materialforschung und -prüfung Berlin, GERMANY
Cuéllar, Pablo;  Bundesanstalt für Materialforschung und -prüfung Berlin, GERMANY
Rica, Shilton ;  University of Luxembourg > Faculty of Science, Technology and Communication (FSTC) > Engineering Research Unit
Rackwitz, Frank;  Faculty of Civil Engineering, Technische Universität Berlin Berlin, GERMANY
External co-authors :
yes
Language :
English
Title :
An enhanced interface model for friction fatigue problems of axially loaded piles
Publication date :
09 June 2019
Event name :
Proceedings of the ASME 2019 38th International Conference on Ocean, Offshore and Arctic Engineering OMAE2019
Event organizer :
The Department of Naval Architecture, Ocean and Marine Engineering, University of Strathclyde; and The American Society of Mechanical Engineers (ASME)
Event place :
Glasgow, United Kingdom
Event date :
9-06-2019 to 14-06-2019
Audience :
International
Main work title :
Proceedings of the ASME 2019 38th, International Conference on Ocean, Offshore and Arctic Engineering, Glasgow 9-14 June 2019
Peer reviewed :
Peer reviewed
Focus Area :
Computational Sciences
Available on ORBilu :
since 06 June 2019

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