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INCOLD Journal (A Half Yearly Technical Journal of Indian Committee on Large Dams)
Year : 2015, Volume : 4, Issue : 1
First page : ( 14) Last page : ( 19)
Print ISSN : 2278-4683. Online ISSN : 2278-4691.

Comparison of 2D and 3D Finite Element Analysis of Dams with Foundation-Structure Interaction

Mahesh M.J., Pandey A.D., Das R., Anvesh S.,  Soumya, Saini P.

Department of Earthquake Engineering, Indian Institute of Technology, Roorkee, Uttarakhand

Online published on 12 January, 2015.

Abstract

Monolith of a concrete gravity dam inclusive of foundation are normally idealized as 2D structures for analysis. However, for dams situated on a V-shaped valley or a canyon with stepped or tapered monolith, the 2D idealization may not always be justified. The variation of stiffness along the length of the monolith results in a differential displacement resulting in greater stress on the stiffer side of the monolith. A 3D model of such a gravity dam monolith is compared with the corresponding 2D model using ANSYS. Further, a modal analysis indicates the presence of out of plane modes in the case of 3D model, which the 2D model could not represent. As a consequence, the 3D model shows higher stress than the 2D for response spectrum analysis. it is recommended that, in such cases a judicious approach be adopted and a parametric study be conducted to address the shortcomings.

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Keywords

Finite element method, Gravity dam, Foundation-structure interaction, 3D analysis.

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