A THEORETICAL STUDY OF THE CYCLIC SHAKEDOWN OF LATERALLY LOADED PILES

A method is described for examining the theoretical response of single vertical piles to cyclic lateral load. The soil-pile interaction model is bilinear-elasto-plastic and is based on subgrade reaction theory. The model allows the effects of soil yielding and pile-soil separation to be considered for any arbitrary loading programme. Pile displacements and bending moments can be determined at any stage during loading. By varying the tension and compression spring characteristics, several soil rheological models can be examined. Material degradation is not considered in the present analysis, and the soil properties are assumed to remain constant during cyclic loading. Attention is focussed instead on the mechanical degradation of the soil-pile system caused by plastic deformation of the soil. The increase in pile displacement during cyclic loading, resulting from the development of residual pressures along the pile or separation between the pile and the soil, is examined. Cyclic lateral loading also introduces a third mode of failure - failure of a pile to shakedown. Techniques are developed to calculate the shakedown limit and comparisons are made between this shakedown limit and the failure loads due to "short" and "long" pile failure. The influence of the soil model, loading programme, relative pile stiffness and pile yield moment on the cyclic behaviour of a laterally loaded pile are studied. (Author/TRRL)

• Corporate Authors:

  University of Sydney

  School of Civil Engineering, Parramatta Road
  Sydney, New South Wales  Australia  2006
• Authors:
  • Swane, I C
  • POULOS, H G
• Publication Date: 1982-7

Media Info

• Features: Figures; References; Tables;
• Pagination: 50 p.

Subject/Index Terms

• TRT Terms: Behavior; Bending; Coefficient of subgrade reaction; Deterioration; Dislocation (Geology); Elasticity (Mechanics); Failure; Loads; Mathematical models; Methodology; Motion; Plasticity; Repeated loads; Rheology; Shakedown tests; Soil mechanics; Soils; Stiffness; Support piles
• Uncontrolled Terms: Side; Vertical
• Old TRIS Terms: Pile lateral loads; Shakedown; Yield
• ITRD Terms: 9001: Behaviour; 5255: Deterioration; 5912: Elasticity; 5520: Failure; 6473: Mathematical model; 9102: Method; 5483: Movement; 3399: Pile; 5922: Plasticity; 5588: Repetitive loading; 5442: Rheology; 9074: Side; 4156: Soil; 5755: Soil mechanics; 5931: Stiffness; 9087: Vertical
• Subject Areas: Bridges and other structures; Design; Geotechnology; Highways; I24: Design of Bridges and Retaining Walls;

Filing Info

• Accession Number: 00378329
• Record Type: Publication
• Source Agency: ARRB
• Report/Paper Numbers: R 415 Monograph
• Files: ITRD, TRIS, ATRI
• Created Date: Oct 30 1983 12:00AM