A Comparative Study between Pseudo-static and Dynamic Analyses on Rock Wedge Stability of an Arch Dam

https://doi.org/10.28991/cej-030977
Abutment Stability Dynamic Analysis Pseudo-Static Analysis Safety Factor Of Wedge Reduction Factor Londe Method.

Authors

  • Hasan Mostafaei PhD Candidate, Faculty of Civil Engineering, Isfahan University of Technology, Isfahan, Iran., Iran, Islamic Republic of
  • Morteza Sohrabi Gilani
    m.sohrabi@guilan.ac.ir
    Assistant Professor, Department of Civil Engineering, University of Guilan, Rasht, Iran., Iran, Islamic Republic of
  • Mohsen Ghaemian Professor, Faculty of Civil Engineering, Sharif University of Technology, Tehran, Iran., Iran, Islamic Republic of
Vol. 4 No. 1 (2018): January
Research Articles

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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.