| "We propose a new hysteretic rule for p-y curves to be used in the dynamic analysis of deep founda-tions. We first examine the results of past lateral cyclic pile load experiments to clarify the characteristicsthat are to be modeled in the load transfer hystereses in p-y curves. We then undertake an analytical studyof soil element behavior when subject to cyclic passive (compressive) and active (extensile) deformation.We found that the soil resistance intensity to piles varies with different cyclic loading patterns, as thestress-dilatancy behavior in soil varies with cyclic loading patterns. We developed a new hysteretic rulethat satisfies the observed dominant characteristics. Although the proposed hysteretic rule has its back-ground in the peak-oriented rule, it is further extended to be a function of the loading pattern. Numerical tests using the proposed model showed that the model is capable of reproducing observed differences in the behavior of piles subjected to fully-reversed cyclic loading and one-sided cyclic loading, even thoughthe typical peak-oriented rules are unable to predict these outcomes." |
