A REPORT ON FIELD TESTS OF PRESTRESSED CONCRETE PILES DURING DRIVING

FIELD TESTS WERE CONDUCTED OF TWO PRESTRESSED CONCRETE PILES TO OBTAIN DATA ON THE STRESSES AND DISPLACEMENTS OF RELATIVELY SHORT PILES. TWO PRECAST PRESTRESSED CONCRETE PILES 26 FEET LONG AND 16 INCHES SQUARE WERE INSTRUMENTED WITH STRAIN GAGES AND TESTED DURING DRIVING IN A FIRM COASTAL CLAY DEPOSIT. DURING DRIVING, STRAIN GAGE MEASUREMENTS AND THE PILE DISPLACEMENTS WERE RECORDED ON A MULTI-CHANNEL RECORDING OSCIOLOGRAPH. THE FIELD STUDY OF THE DYNAMIC STRESSES AND DISPLACEMENTS OF RELATIVELY SHORT PRESTRESSED CONCRETE PILES DRIVEN IN A FIRM CLAY, SHOW THE FOLLOWING CONCLUSIONS: (1) MAXIMUM COMPRESSIVE STRESSES OCCURRED AT THE HEAD OF THE PILE WHEN FIRM RESISTANCE TO PENETRATION WAS ENCOUNTERED, (2) MAXIMUM TENSILE STRESSES WERE FOUND TO OCCUR AT THE MID-POINT AND 3-QUARTER POINT OF THE PILES, (3) THE COMPUTED STRESSES AND DISPLACEMENTS AGREED FAIRLY WELL WITH THE MEASURED DATA, AND (4) THE MAGNITUDE OF THE TENSILE STRESSES IN THESE SHORT PILES WAS ONLY ABOUT 1/2 OF THOSE MEASURED PREVIOUSLY IN PILES OF 92 AND 90 FEET IN LENGTH. THE COMPRESSIVE STRESSES WERE ABOUT THE SAME MAGNITUDE.

• Supplemental Notes:
  • Progress RePORT, NO 2-5-62-33, 44 PP, 11 FIG, 7 TAB, 5 REF
• Corporate Authors:

  Texas Transportation Institute

  Texas A&M University System, 1600 E Lamar Boulevard
  Arlington, TX  United States  76011
• Authors:
  • Hirsch, T J
• Publication Date: 1963-8

Subject/Index Terms

• TRT Terms: Compressive strength; Dislocation (Geology); Field tests; Oscillographs; Pile driving; Precast concrete; Prestressed concrete; Strain gages; Stresses; Support piles; Tension
• Uncontrolled Terms: Tensile stress
• Old TRIS Terms: Prestressed concrete piles
• Subject Areas: Bridges and other structures; Geotechnology; Highways;

Filing Info

• Accession Number: 00208553
• Record Type: Publication
• Files: TRIS
• Created Date: Aug 3 1970 12:00AM