PLASTIC COLLAPSE LOADS BY THE FINITE ELEMENT METHOD. PROCEEDINGS OF THE ELEVENTH INTERNATIONAL CONFERENCE ON SOIL MECHANICS AND FOUNDATION ENGINEERING, SAN FRANCISCO, 12-16 AUGUST 1985

In finite element computations with elasto-plastic soil models overshoot of theoretical failure loads do often occur. This paper shows how overshoot sometimes is bound to happen due to a conflict between the plastic flow rule and the finite element discretization. The conflict arises when a plastic deformation mode as defined by the flow rule, may not be exactly modelled by the shape functions and the available degrees of freedom for an element. The deviation from exact modelling will provide an artificial elastic stiffness even at theoretical failure. The theoretical considerations presented herein are supported by numerical results where the behaviour of three element types is studied. The use of reduced integration will be seen to be an advantage for a fulfillment of the requirements derived. These requirements are more restrictive than the one of incompressibility often studied in previous papers on the topic. For the covering abstract of the conference see IRRD 287689. (Author/TRRL)

• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/isbn/9061915643
• Corporate Authors:

  AA Balkema

  P.O. Box 1675
  Rotterdam,   Netherlands  BR-3000
• Authors:
  • Nordal, S
  • Antonsen, P
• Publication Date: 1985

Media Info

• Features: Figures; References;
• Pagination: p. 603-606
• Serial:
  • Publication of: Balkema (AA)
  • Publisher: AA Balkema

Subject/Index Terms

• TRT Terms: Conferences; Failure; Finite element method; Loads; Mathematical models; Plastic deformation; Plastic flow; Soils; Theory
• Subject Areas: Geotechnology; Highways;

Filing Info

• Accession Number: 00466257
• Record Type: Publication
• Source Agency: Transport Research Laboratory
• ISBN: 90 6191 564 3
• Files: ITRD, TRIS
• Created Date: Mar 31 1988 12:00AM