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Assessment of Foundation Mass and Earthquake Input Mechanism Effect on Dam–Reservoir–Foundation System Response

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Abstract

Concrete dams are one of the most important infrastructures in every country and the seismic safety assessment of them is a major task in dam engineering field. Dam–foundation–reservoir system analysis is a complex interaction problem because this system consists of three domains with different behaviors. For accurate analysis of this system, some important factors should be considered such as foundation mass and earthquake input mechanism. In this paper, the effect of foundation mass and earthquake input mechanism on seismic response of concrete gravity dam is investigated. For this purpose, two different methods are introduced for modeling of massed semi-infinite foundation in finite element method, namely free-field boundary condition and domain reduction method (DRM). To verify the feasibility of proposed methods for seismic analysis of dam–foundation–reservoir system, the displacement and stress outputs using proposed methods are compared with EAGD-84 results. The obtained results indicate that both methods are accurate enough for finite element modeling of massed foundation. Finally, Koyna concrete gravity dam is analyzed for rigid, massless and massed foundation cases using DRM and it is concluded that the foundation has significant effect on dam response and the common massless foundation approach overestimates the dam response.

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Authors and Affiliations

  1. Department of Civil Engineering, Sharif University of Technology, Tehran, Iran

    Mohsen Ghaemian & Hamid Mohammadnezhad

  2. Faculty of Civil, Water and Environmental Engineering, Shahid Beheshti University, Tehran, Iran

    Ali Noorzad

  3. Iranian Committee on Large Dams (IRCOLD), Tehran, Iran

    Ali Noorzad

Authors
  1. Mohsen Ghaemian
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  2. Ali Noorzad
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  3. Hamid Mohammadnezhad
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Correspondence to Mohsen Ghaemian.

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Ghaemian, M., Noorzad, A. & Mohammadnezhad, H. Assessment of Foundation Mass and Earthquake Input Mechanism Effect on Dam–Reservoir–Foundation System Response. Int J Civ Eng 17, 473–480 (2019). https://doi.org/10.1007/s40999-018-0325-9

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  • DOI: https://doi.org/10.1007/s40999-018-0325-9

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