Influence of Sediment Layers on Dynamic Behavior of Aged Concrete Dams
Publication: Journal of Engineering Mechanics
Volume 133, Issue 4
Abstract
The assessment of response of an aged concrete dam is important for the prediction of its behavior during earthquakes, so that remedial measures can be taken at the right time to withstand future earthquakes. The assessment is necessary, since the analyses procedures may become obsolete and the state of the art may change as the time of construction and the structural material may deteriorate due to harsh environmental conditions. At the same time, the sediment will be accumulated at the reservoir bottom on the upstream side of the dam. The process of siltation depends on the reservoir topography and climatic variability, i.e., increased flood frequency and river inflow. The decision of retrofitting or strengthening the aged dam necessitates accurate analysis of the same in the presence of accumulated sediment. In this paper, an approach to include the time-dependent degradation of concrete owing to environmental factors and mechanical loading in terms of isotropic degradation index is presented. The absorption of pressure waves at the bottom of the reservoir due to the presence of sediments has been incorporated in the hydrodynamic pressure equation. The response of an aged concrete dam in the presence of sediment layers under seismic excitation is studied. The outcomes show the efficiency of the proposed algorithm.
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Acknowledgments
The writers would like to acknowledge the Ministry of Human Resource and Development (MHRD), Government of India for funding the financial support for this research work.
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Information & Authors
Information
Published In
Journal of Engineering Mechanics
Volume 133 • Issue 4 • April 2007
Pages: 400 - 413
Copyright
© 2007 ASCE.
History
Received: Aug 5, 2005
Accepted: Jun 22, 2006
Published online: Apr 1, 2007
Published in print: Apr 2007
Notes
Note. Associate Editor: Arif Masud
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