Based on the ABAQUS finite element code

the soil dynamic nonlinear constitutive model of Ramberg- Osgood has been modified. Based on the appropriate assumptions

the procedure and the algorithm for evaluation of the model’s parameters R and ? are derived. Loading and unloading rules of the hysteresis correspond to the revised Masing criterion. Three-dimensional nonlinear ground seismic analysis has been performed

the influence of seismic waves with different input peak value on soil stress-strain relationship has been analyzed

and the results have been compared with that of the one-dimensional soil dynamic analysis on Shaking code. The results show that the horizontal displacement and relative displacement obtained by the nonlinear analysis are greater than that obtained by equivalent linearization method

which indicates that the selection of constitutive model will affect the obtained results of ground seismic response; thus it is necessary to select the appropriate model in engineering application and make reasonable judgments for the final result.