STRESSES IN A PILE SUBJECTED TO IMPACT LOADS THROUGH AN ELASTIC CUSHIONING BLOCK

A MATHEMATICAL SOLUTION OF THE PILE-DRIVING STRESS PROBLEM IS DEDUCED, TAKING INTO ACCOUNT THE EFFECT OF AN ELASTIC CUSHION BETWEEN HAMMER AND PILE TOP. THE PILE IS REPRESENTED BY A VERTICAL ELASTIC BAR AND THE DISPLACEMENT AT ITS LOWER END IS ASSUMED TO BE ZERO. THE INVESTIGATED CASE THUS REPRESENTS THE INITIAL DISPLACEMENT CONDITIONS DURING PILE DRIVING INTO A HARD SOIL LAYER, WHEN MAXIMUM COMPRESSIVE STRESSES ARE EXPECTED TO ARISE IN THE PILE. RESULTS OBTAINED ARE ILLUSTRATED BY COMPARING STRESS INTENSITIES IN THREE CASES WITH DIFFERENT CUSHION-PILE STIFFNESS RATIOS AND DIFFERENT ASSUMED PILE-HAMMER MASS RATIOS AND HAMMER-SOUND (ELASTIC WAVE) VELOCITY RATIOS. A PRONOUNCED SHOCK-ABSORBING EFFECT OF THE ELASTIC CUSHION IS FOUND - A RESULT WHICH APPARENTLY IS IN GOOD AGREEMENT WITH PRACTICAL EXPERIENCE AND STRESS MEASUREMENTS DURING PILE DRIVING. /AUTHOR/

  • Authors:
    • Didukh, B I
    • Trifonov-yakovlev, D A
  • Publication Date: 1970-5

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  • Accession Number: 00209650
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Jun 5 1972 12:00AM