THE DISTRIBUTION OF LOAD IN LONG PILES

THE BEHAVIOR OF A SINGLE PILE WHEN LOADED AND TWO METHODS OF DETERMINING LOAD DISTRIBUTION BETWEEN SHAFT FRICTION AND END BEARING ARE DESCRIBED. BOTH METHODS ARE BASED ON THE ELASTIC COMPRESSION OR FLEXIBILITY OF THE PILE UNDER LOAD. IN THE FIRST METHOD, MECHANICAL GAUGES, CALLED TELL-TALES MEASURE THE COMPRESSIONS OF THE PILE MEMBER OVER PRESELECTED LENGTHS, ENABLING DISPLACEMENTS AT THE PILE TIP AND OTHER POINTS TO BE OBTAINED. INTERPRETATION BY ELASTICITY THEORY REVEALS THAT LARGE RESIDUAL LOADS REMAIN IN THE PILE MEMBER AFTER IT IS UNLOADED. THE LOAD DISTRIBUTION IS A FUNCTION OF PILE FLEXIBILITY, LENGTH AND MOVEMENT OF THE PILE RELATIVE TO THE SOIL; AND THE VAN WEELE GRAPHICAL CONSTRUCTION UNDERESTIMATES THE FRICTION LOAD COMPONENT. THE SECOND METHOD CONSIDERS THE LOAD-SETTLEMENT DIAGRAMS. WHEN THE LOAD JUST REACHES THE PILE TIP THE SLOPE OF THE LOAD-SETTLEMENT CURVE IS PARALLEL TO THE ELASTIC SHORTENING CURVE FOR THE PILE MEMBER. AN ANALYSIS OF TEN INSTRUMENTED PILES CONFIRMS THE VALIDITY OF THIS APPROACH. IT IS CONCLUDED THAT BOTH TECHNIQUES ARE USEFUL PRACTICAL TOOLS WHICH CAN EASILY BE INCORPORATED IN ROUTINE PILE TESTING PROGRAMS. /AUTHOR/

• Supplemental Notes:
  • Vol 6, No 22-23, PP 5-15
• Authors:
  • HANNA, T H
• Publication Date: 1971-4

Media Info

• Serial:
  • Sols-Soils

Subject/Index Terms

• TRT Terms: Compression; Diagrams; Elasticity (Mechanics); Flexibility; Load transfer; Loads; Settlement (Structures); Support piles
• Old TRIS Terms: Elastic theory; Load settlement diagram
• Subject Areas: Geotechnology; Highways; Materials;

Filing Info

• Accession Number: 00217111
• Record Type: Publication
• Files: TRIS
• Created Date: Jun 22 1971 12:00AM