### Abstract

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 percent 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 N//S//e//q versus M relationship. A statistical relationship between N//S//e//q and the earthquake magnitude is proposed here based on results available in the literature. The N//S//e//q could be estimated adequately by considering the component of excitation containing the peak acceleration. The N//S//e//q versus M relationship proposed is somewhat different from the relationship suggested by Seed and Idriss. This discrepancy in N//S//e//q values may not yield significant differences in estimating the soil strength in a liquefaction study.

Original language | English (US) |
---|---|

Pages (from-to) | 577-589 |

Number of pages | 13 |

Journal | Journal of the Geotechnical Engineering Division |

Volume | 107 |

Issue number | 5 |

State | Published - May 1981 |

Externally published | Yes |

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### ASJC Scopus subject areas

- Engineering(all)
- Earth and Planetary Sciences(all)
- Environmental Science(all)

### Cite this

*Journal of the Geotechnical Engineering Division*,

*107*(5), 577-589.

**STATISTICAL STUDY OF UNIFORM CYCLES IN EARTHQUAKES.** / Haldar, Achintya; Tang, Wilson H.

Research output: Contribution to journal › Article

*Journal of the Geotechnical Engineering Division*, vol. 107, no. 5, pp. 577-589.

}

TY - JOUR

T1 - STATISTICAL STUDY OF UNIFORM CYCLES IN EARTHQUAKES

AU - Haldar, Achintya

AU - Tang, Wilson H.

PY - 1981/5

Y1 - 1981/5

N2 - 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 percent 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 N//S//e//q versus M relationship. A statistical relationship between N//S//e//q and the earthquake magnitude is proposed here based on results available in the literature. The N//S//e//q could be estimated adequately by considering the component of excitation containing the peak acceleration. The N//S//e//q versus M relationship proposed is somewhat different from the relationship suggested by Seed and Idriss. This discrepancy in N//S//e//q values may not yield significant differences in estimating the soil strength in a liquefaction study.

AB - 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 percent 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 N//S//e//q versus M relationship. A statistical relationship between N//S//e//q and the earthquake magnitude is proposed here based on results available in the literature. The N//S//e//q could be estimated adequately by considering the component of excitation containing the peak acceleration. The N//S//e//q versus M relationship proposed is somewhat different from the relationship suggested by Seed and Idriss. This discrepancy in N//S//e//q values may not yield significant differences in estimating the soil strength in a liquefaction study.

UR - http://www.scopus.com/inward/record.url?scp=0019391940&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0019391940&partnerID=8YFLogxK

M3 - Article

AN - SCOPUS:0019391940

VL - 107

SP - 577

EP - 589

JO - Journal of Geotechnical and Geoenvironmental Engineering - ASCE

JF - Journal of Geotechnical and Geoenvironmental Engineering - ASCE

SN - 1090-0241

IS - 5

ER -