Statistical study of uniform cycles in earthquakes.

A. Haldar, W. H. Tang

Research output: Contribution to journalArticlepeer-review

17 Scopus citations


The applicability of equivalent uniform stress cycles in soil dynamics to the study of soil behavior during and after an earthquake is explored. The actual irregular time histories produced by an earthquake can be represented by uniform amplitude cyclic stresses, although there may be a considerable amount of uncertainty associated with them. The stress level of 75% of the maximum is suggested for such conversion, since in this case the uncertainty in the normalized soil-strength curve has a minimum effect on the value of the Neq versus M relationship. A statistical relationship between Neq and the earthquake magnitude is proposed here based on results available in the literature. The Neq could be estimated adequately by considering the component of excitation containing the peak acceleration. The Neq versus M relationship proposed is somewhat different from the relationship suggested by Seed and Idriss. This discrepancy in Neq values may not yield significant differences in estimating the soil strength in a liquefaction study. -from ASCE Publications Abstracts

Original languageEnglish (US)
Pages (from-to)577-589
Number of pages13
JournalJournal of the Geotechnical Engineering Division, ASCE
Issue numberGT5, Proc. Paper, 16239
StatePublished - 1981

ASJC Scopus subject areas

  • General Engineering


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