PILE GROUP FOUNDATIONS

THE SCOPE WAS LIMITED PRIMARILY TO THE CONSIDERATIONS OF (1) LATERAL RESISTANCE OF SOILS AGAINST PILES, AND (2) BEHAVIOR OF PILE GROUPS. THE OBJECTIVE IS TO DEVELOP A RATIONAL METHOD OF ANALYSIS AND DESIGN EMPLOYING THE AXIAL AND LATERAL RESISTANCES OF EACH PILE, INCLUDING THE EFFECT OF GROUPING OF THE PILES. THE PROPOSED ANALYSIS EMPLOYS THE CONCEPT OF THE EQUIVALENT CANTILEVER LENGTHS, WHICH ASSUMES THAT THE PILES ARE FIXED AT SOME DEPTHS BELOW THE GROUND SURFACE. THESE LENGTHS ARE THE FUNCTIONS OF THE SOIL CHARACTERISTICS, MATERIAL PROPERTIES, AND THE LOCATIONS OF THE PILES IN GROUPS. A TWO-DIMENSIONAL ANALYSIS OF THE PILE GROUP FOUNDATIONS WAS INCLUDED IN REPORT NO. 69-2. THE STEPS INVOLVED IN THE THREE-DIMENSIONAL ANALYSIS ARE: (1) EVALUATION OF THE EQUIVALENT LENGTHS FOR THE INDIVIDUAL PILES, (2) DERIVATION OF STIFFNESS MATRICES FOR INDIVIDUAL PILE ELEMENTS, (3) GENERATION OF THE STRUCTURAL STIFFNESS MATRIX FROM STEP TWO, (4) DEVELOPMENT OF AN ALGORITHM TO OBTAIN THE DISPLACEMENTS OF THE SUPERSTRUCTURE FROM THE STRUCTURAL STIFFNESS MATRIX, AND (5) DEVELOPMENT OF AN ALGORITHM FOR USING THE DISPLACEMENTS TO OBTAIN THE FORCES AND MOMENTS AT EACH PILE HEAD. THE PROPOSED ANALYSIS IS SUPPLEMENTED WITH THE DYNAMIC ANALYSIS, WHICH IS DEVELOPED ON THE ASSUMPTION THAT THE PILE GROUP SYSTEM AND THE SOIL ENCLOSED IN THE SYSTEM ACT AS A SINGLE LUMPED-MASS HAVING SIX DEGREES OF FREEDOM. AN ALGORITHM TO EVALUATE THE NATURAL FREQUENCIES HAS BEEN DEVELOPED. COMPARISION BETWEEN THE ANALYTICAL VALUES AND THE AVAILABLE TEST DATA FROM FIFTEEN EXISTING FULL-SCALE TESTS IS FAIRLY GOOD. /AUTHOR/

  • Corporate Authors:

    Bucknell University

    Lewisburg, PA  United States  17837

    Pennsylvania Department of Transportation

    1215 Transportation and Safety Building
    Harrisburg, PA  United States  17120

    Federal Highway Administration

    1200 New Jersey Avenue, SE
    Washington, DC  United States  20590
  • Authors:
    • Kim, J B
    • Kindig, C H
    • Bhattacharya, S
  • Publication Date: 0

Subject/Index Terms

Filing Info

  • Accession Number: 00230718
  • Record Type: Publication
  • Source Agency: Federal Highway Administration
  • Report/Paper Numbers: 68-25
  • Files: TRIS, USDOT, STATEDOT
  • Created Date: Oct 19 1970 12:00AM