A finite element-boundary element (FE-BE) procedure is presented for dynamic analysis of concrete arch dams which considers the effects of non-uniform ground motion. In this technique, dam body is discretised by finite elements, while foundation rock domain is handled by three dimensional boundary element formulations with no restrictions imposed on geometry of canyon shape. Based on this methodology, the program “MAP-76” is enhanced and the response of Morrow Point arch dam is studied. The efficiency of the technique relies heavily on an interpolation scheme, which is used for evaluation of foundation impedance matrix and force vector. The convergence of this method is initially controlled for uniform, as well as non-uniform ground excitations. Subsequently, the effects of non-uniform ground motion are evaluated and discussed for vertically propagating SH, P and SV waves.

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