Influence of Material Nonlinearity of Foundation in the Dam Foundation Interaction Analysis

Abstract eng:
The effects of material nonlinearity of the foundation domain have been investigated in connection with the iterative analysis procedures of soil-structure interaction problems. For the purpose of analysis, a concrete gravity dam has been selected as the structure. An algorithm for the iterative analysis of SSI problems has been proposed and verified with the published results. The effects of different impedance ratios (the ratio of foundation stiffness and dam stiffness) have been investigated in some details in the present paper. The dam has been modeled as linear, elastic material. The foundation material has been modeled as both linear, elastic material and nonlinear elastic material. The widely known Duncan-Chang soil model has been chosen to represent the nonlinear material behavior of soil/rock foundation. The comparison of results of the interaction analysis for the linear foundation with those of the nonlinear foundation has been presented. The results clearly display pronounced effects of displacements and stresses for the structure compared to the case when both dam and foundation are assumed to be composed of linear, elastic materials. For the time integration of the dynamic equation of motion, the implicit-explicit Newmark scheme has been adopted. The results clearly emphasize the need for the consideration of a proper nonlinear treatment of the foundation material during the soil-structure interaction analysis, especially when the structure is subjected to severe ground motion during any earthquake.

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