Dynamic Analysis Of Middle Awash Multi-purpose Dam

In this dynamic analysis research, Middle Awash high dam which is located inrnEthiopian rift valley seismic zone is analyzed for pre and post earthquake stabilityrnand permanent deformations due to earthquake loads.rnThe dynamic analysis is done adopting three elsewhere recorded earthquake timernhistories, which have different period and duration. Applying these seismic shocksrnand using the Newmark deformation method, it is found that the inducedrndeformations do not require additional extension of dam or cumber height. Thernupstream and downstream slopes showed sufficient performance against sliding.rnThe upstream section steepening is found to be more economical, yet achievingrnthe minimum required factors of safety for static and post earthquake slidingrnfailure.rnThe thick alluvium foundation of the dam is found to liquefy immediately after therndesign base earthquake started.rnThe pseudo-static seismic analysis recommends uneconomical dam sectionrnmodification.rnThe Finite Element and Limit Equilibrium Methods shown to be conservative inrncalculating sliding factor of safety for downstream and upstream slopes,rnrespectively.rnKey words: Maximum credible earthquake, Design base earthquake, Finiternelement method, Limit equilibrium method, Permanent deformation andrnLiquefaction.

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