Abstract
In this study, the abutment stability of arch dams for two cases of pseudo-static and dynamic methods were compared based on limit state equilibrium method. For the pseudo-static approach, unit accelerations were applied to the model in three directions for calculating thrust forces. For dynamic analysis, three components of ground acceleration time histories of Kobe earthquake, 1979 were applied to the finite element model of dam-foundation-reservoir, and the thrust forces were obtained. The effect of reduction factors in pseudo-static analysis is investigated in order to obtain the reduction factor that corresponds to wedge movement in dynamic analysis. For this purpose, the reduction factors have been increased from 0.5 to 1. The obtained results indicate that pseudo-static results are more conservative than the dynamic analysis method for small reduction factors and the reduction factor plays a key role on the abutment stability analysis.
Highlights
Concrete arch dams are large structures that should be investigated for seismic loadings
The results indicated that the traditional method overestimated the wedge displacement in comparison with the finite element method [12]
They found that the uplift pressure plays a key role in the abutment stability analysis and it is necessary to control the uplift pressure and seepage in arch dam foundations [14, 15]
Summary
Concrete arch dams are large structures that should be investigated for seismic loadings. The opening/slipping of joints between a potential wedge at the left abutment and remaining foundation originated the nonlinear behavior in foundation They indicated that the considering foundation nonlinearity has no significant effect on the results in the considered case due to special design of the body shape [13]. Mostafaei et al conducted an analytical study on abutment stability due to seismic loading to obtain the probable wedge displacements They found that the uplift pressure plays a key role in the abutment stability analysis and it is necessary to control the uplift pressure and seepage in arch dam foundations [14, 15]. The obtained results indicate that the reduction factor of 0.88 corresponds the wedge stability in dynamic approach
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