Structural Stability And 2d Finite Element Analysis of Concrete Gravity Dam
Journal Title: International Journal of Engineering and Science Invention - Year 2018, Vol 7, Issue 1
Abstract
Concrete Gravity Dams are important lifeline structures and represent the fragrance of people’s standard of living. Dam structures that span navigable waterways are inherently at a risk for seismic vibrations and as such they must be designed to resist these vibrations. These are very complex structures and subjected to various types of forces both static and dynamic in nature. Conventional 2 dimensional methods are used for the preliminary analysis and to check the stability criteria for dam structures. Provided the results obtained from such analysis are over-estimated, it is still useful for the preliminary analysis. In this work a 2 dimensional stability analysis of a non-overflow section of the Koyna dam having maximum height of 103 m and base width of 70 m is done first using the Gravity method of analysis which is a rational analysis method. Various forces acting on the dam body including vertical and horizontal earthquake forces are worked out and the stresses are manually calculated at different points, i.e. at heel and toe. Considering the same cross sectional dimensions and material properties a 2D finite element model of the dam is simulated using ANSYS APDL R.18.2. The stress results found through both approaches are tabulated and are compared for the accuracy of manual calculations. Dam-foundation-reservoir interaction is neglected and the dam is assumed to be fixed at the base. Earthquake force is the inertia force induced due to acceleration caused by earthquake, and this acceleration is considered as a fraction of Peak Ground Acceleration (PGA) applied to the dam. The dam material is assumed to be elastic and isotropic. The worst conditions for earthquake forces are considered and two cases i.e. reservoir empty and reservoir full conditions are considered.
Authors and Affiliations
Khalid Dawlatzai, Dr. Manju Dominic
Keywords
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