Application Of Pseudo-Symmetric Technique For
Seismic Analysis Of Concrete Arch Dams
Author(s)
O. Omidi & V. Lotfi
Abstract
Dam–reservoir interaction can be treated by different approaches. One of the
efficient methods available for time domain analysis is referred to as Pseudo–
Symmetric technique. In the present study, a gravity dam example is considered
to verify this technique. Subsequently, water compressibility effects on seismic
behaviour of a typical concrete arch dam are studied. It is found that by
considering water compressibility the maximum tensile stresses mat increase
significantly which may lead to more severe damage during an earthquake.
Keywords: concrete arch dams, water compressibility, coupled equations,
Pseudo-Symmetric technique, wave equation, Lagrangion–Eulerian formulation.
1 Introduction
The earthquake analysis of concrete dams has been the subject of extensive
studies during the last three decades because of the importance of their safety
evaluation. The dam–reservoir interaction problem encountered in such an
analysis is a complex task which is traditionally represented using the added
mass approach. The added mass approximation may lead to significant error in
response during an earthquake [1]. The dam–reservoir system is classified as a
coupled field problem that two separate regions of fluid and structure interact
only at their interface. In order to solve these coupled equations, several methods
exist in both time and frequency domains. Although this problem is formulated
very efficiently in frequency domain, it is limited to linear dynamic
analysis [2, 3]. Therefore, time domain methodology is mainly preferred due to
the fact that it can be also employed for nonlinear analyses.
Keywords
concrete arch dams, water compressibility, coupled equations,
Pseudo-Symmetric technique, wave equation, Lagrangion–Eulerian formulation.
Related Book
Other papers in this volume
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