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Nonlinear dynamic analysis of concrete gravity dams utilizing a simplified continuum damage model and different damping algorithms

Nonlinear dynamic analysis of concrete gravity dams utilizing a simplified continuum damage model... Evaluating safety and stability of concrete dams in highly seismic regions is an increasing concern. Therefore, proposing an effective model that can predict crack propagation with good accuracy and low computation time is essential. The purpose of this study is to develop a special purpose finite element program for nonlinear dynamic analysis of concrete gravity dams. Despite its simple formulation and preferably easy programing, it should be able to predict acceptable crack patterns compared with previous studies. For this aim, a finite element program is developed based on a simplified isotropic continuum damage model. It also relies on the Hilber–Hughes–Taylor time integration method. Moreover, three different damping algorithms are employed in this program to study the nonlinear response of Koyna dam. It is concluded that variable damping algorithms leads to a more localized crack pattern in comparison to constant damping algorithm alternative. Furthermore, by increasing the numerical damping (i.e., α-factor) in the Hilber–Hughes–Taylor time integration method, the results of varying damping in each step get close to the results of varying damping in each iteration. Therefore, varying damping in each step with higher α-factors can be a suitable replacement to more common strategy in this respect due to its significant computational time saving. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Asian Journal of Civil Engineering Springer Journals

Nonlinear dynamic analysis of concrete gravity dams utilizing a simplified continuum damage model and different damping algorithms

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Publisher
Springer Journals
Copyright
Copyright © The Author(s), under exclusive licence to Springer Nature Switzerland AG 2022. Springer Nature or its licensor holds exclusive rights to this article under a publishing agreement with the author(s) or other rightsholder(s); author self-archiving of the accepted manuscript version of this article is solely governed by the terms of such publishing agreement and applicable law.
ISSN
1563-0854
eISSN
2522-011X
DOI
10.1007/s42107-022-00511-2
Publisher site
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Abstract

Evaluating safety and stability of concrete dams in highly seismic regions is an increasing concern. Therefore, proposing an effective model that can predict crack propagation with good accuracy and low computation time is essential. The purpose of this study is to develop a special purpose finite element program for nonlinear dynamic analysis of concrete gravity dams. Despite its simple formulation and preferably easy programing, it should be able to predict acceptable crack patterns compared with previous studies. For this aim, a finite element program is developed based on a simplified isotropic continuum damage model. It also relies on the Hilber–Hughes–Taylor time integration method. Moreover, three different damping algorithms are employed in this program to study the nonlinear response of Koyna dam. It is concluded that variable damping algorithms leads to a more localized crack pattern in comparison to constant damping algorithm alternative. Furthermore, by increasing the numerical damping (i.e., α-factor) in the Hilber–Hughes–Taylor time integration method, the results of varying damping in each step get close to the results of varying damping in each iteration. Therefore, varying damping in each step with higher α-factors can be a suitable replacement to more common strategy in this respect due to its significant computational time saving.

Journal

Asian Journal of Civil Engineering – Springer Journals

Published: Feb 1, 2023

Keywords: Nonlinear dynamic analysis; Concrete gravity dams; Continuum damage model; Different damping algorithms

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