Abstract
The objective of this work is to analyze the dynamic behavior (modal behavior) of the "Oued Taht" arch dam located at MASCARA, taking into consideration the effect of soil-fluid-structure interaction. The finite element code "Ansys" was chosen for the dynamic modeling of the dam that is the subject of this study. Three hypotheses were used for soil-structure interaction modeling; model with embedded base which corresponds to the case where the phenomenon of interactions soil-structure is neglected, model with ground of foundation without mass which consists in taking into account the kinematic component of interaction soil structure and neglecting the inertial component and the model with foundation soil with mass where the two components of soil-structure interaction are taken into account. For the fluid, the model of added masses (equivalent to the westergaard approach) using the SURF element available in the Ansys code library was used. A comparison between the different models of the "Oued Taht" dam was made; it has been found that the taking into account of the soil-fluid-structure interaction phenomenon modifies the period of the system and that the modeling of the dam with and without fluid gives a very important difference of the periods. The results obtained were compared with those of the "Brezina" dam, which is a gravity dam located in BAYADH. The work has shown that the periods of the "Oued Taht" dam with soil-fluid-structure interaction modeling are very out of phase with the periods without fluid modeling (taking into account only the soilstructure interaction phenomenon). which is not the case for the Brezina dam where the periods for the two models are getting closer. The periods between the two models mentioned before are close to the dam of Brézina because the latter is a dam which participates much more by its own weight than by its vault (thickness of the vault varies between 36.3 m at the base and 5m in crest) which is the opposite for the dam "Oued Taht" which participates by its vault (constant thickness of 7 m) thus the membrane effect is present, which is translated by the shift of the periods between the empty case and the filled case.
Highlights
La réponse d’une structure durant un séisme dépend des caractéristiques du signale sismique, du sol de fondation et de la structure elle-même
arch dam located at MASCARA
for the dynamic modeling of the dam that is the subject of this study
Summary
La réponse d’une structure durant un séisme dépend des caractéristiques du signale sismique, du sol de fondation et de la structure elle-même. Le mouvement de la fondation est généralement différent du mouvement en champ libre (la difference du mouvement dépend de la différence de rigidité entre le sol et la fondation), cela est dû au couplage sol-structure durant le séisme, ce phénomène est connu dans la littérature sous le nom « d’interaction sol-structure ». Dans les structures où le domaine fluide existe, le phénomène devient plus compliqué; il s’agit «d’interaction sol-fluide-structure », les barrages en béton font partie de ce phénomène. Ils existent trois modèles pour la modélisation du phénomène d’interaction sol-structure: le modèle de la structure à base encastré, le modèle de la structure avec fondation modélisée sans tenir en compte sa masse, et le modèle de la structure avec fondation tenant en compte sa masse. La figure 1 représente le modèle du barrage à base encastrée (c à d sans tenir en compte le phénomène d’interaction sol-structure)
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