Fatigue theory for cyclic loading of soils
For a prediction of the foundation behavior of gravity structures or for earthquake foundation design, a model for the behavior of soil under cyclic loading is needed. It is common practice to use only a limited set of laboratory tests, for instance at constant stress or constant strain amplitude, and to extrapolate from these tests to random wave loading conditions, under e.g., a prolonged ocean storm. Most extrapolation procedures used to date are based on an implicit assumption that the influence of cyclic loading can be represented by one single fatigue parameter. A mathematical model of soil fatigue is given, from which several possible (or impossible) choices for such a fatigue parameter emerge. It is shown how these choices can be verified or falsified, either on theoretical grounds, or from the results of simple experiments. A practical extrapolation procedure is proposed, for which only constant stress and constant strain amplitude tests are needed.
- OSTI ID:
- 7355015
- Report Number(s):
- CONF-760477-2
- Country of Publication:
- United States
- Language:
- English
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