Abstract
The seismic response of dams is significantly influenced by dynamic Soil-Structure Interaction (SSI) phenomena. Most of the dedicated methods to perform SSI analyses may be classified within two main approaches, namely, the so-called Direct Method and the Substructure Method. The present discussion focuses on a specific formulation of the Direct Method, valid for uniform free-field motion, and less-often adopted in the main stream practical applications, by which the seismic action is converted into inertial loads directly applied to the structure. A Substructure Method implementation is also considered, in canonical form. First, the equivalence of the Direct Method and Substructure Method approaches is theoretically discussed; then, the seismic responses of the Pine Flat dam gathered from both methods are compared, to confirm the analytical outcomes. This study demonstrates that the adopted Direct Method approach provides a wholly equivalent dynamic response, to that from the Substructure Method, with the advantages of being robust enough and rather efficient for self-implementations, possibly employing commercial FEM computer programs.
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Notes
- 1.
The latter assumption should instead be considered inappropriate for long base and/or deeply embedded structures.
- 2.
The numerical model used to estimate the elastic modulus of concrete did not include soil-structure interaction.
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Froio, D., Bariletti, A.U., Eusebio, M., Previtali, R., Rizzi, E. (2021). Direct Method for Dynamic Soil-Structure Interaction Based on Seismic Inertia Forces. In: Bolzon, G., Sterpi, D., Mazzà, G., Frigerio, A. (eds) Numerical Analysis of Dams . ICOLD-BW 2019. Lecture Notes in Civil Engineering, vol 91. Springer, Cham. https://doi.org/10.1007/978-3-030-51085-5_45
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DOI: https://doi.org/10.1007/978-3-030-51085-5_45
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