In this closure to the discussion, the authors agree with the discussers that the investigation of unloading cycles in which unloading is not total is a likely practical occurrence. Results show that the response to repeated loading of 50% Q sub ult to zero is different from the response to a loading range of 50% Q sub ult - 20% Q sub ult. Some work has been conducted to find the effects of loads varying from tension to compression, and it has been found that alternating load tests have a more detrimental effect on anchor behavior than nonaltering loading. A clear picture of system behavior emerges if the improvement in anchor resistance to displacement, defined as a hardening ration, is plotted against the total relative cyclic movement. Although more data are required to enable general behavior to be established, it appears that the cyclic strain limit can be related to the critical cyclic relative movement that corresponds to anchor failure. It is concluded that a realistic failure criterion is defined by unacceptably high relative movements of the anchor, which may be caused by application of a number of equal cycles of loading or by a package of loading amplitudes, resulting in post-repeated loading capacities that are significantly less than the ultimate static capacity.

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Filing Info

  • Accession Number: 00310722
  • Record Type: Publication
  • Report/Paper Numbers: ASCE 13867
  • Files: TRIS
  • Created Date: Oct 8 1980 12:00AM