Elasto-plastic earthquake shear-response of one-dimensional earth dam models.

A simplified analysis procedure for the non-linear hysteretic earthquake response of earth dams is presented. The dam is modelled as a one-dimensional hysteretic shear wedge subjected to base excitation. The hysteretic stress/strain behaviour of the dam materials is modelled by using elasto plastic constitutive equations based on multi surface kinematic plasticity theory. The following investigations are presented: (1) comparison between the results obtained using two soil models depicting different non-linear properties; (2) comparison between the results of the one mode and the multi mode solution expansions; (3) comparison with the results obtained through an elaborate finite element representation of the dam, and finally; (4) comparison with the results obtained through the Makdisi Seed iterative procedure for earth dam analysis. The comparisons show that the proposed technique can be used to determine adequately the transient earthquake response of long earth dams. Furthermore, the efficiency and low computational cost make the technique very attractive; it can easily and systematically be extended to two and three dimensional calculations of earth dam response. (A)