Table of Contents
ISRN Civil Engineering
Volume 2011, Article ID 413057, 14 pages
http://dx.doi.org/10.5402/2011/413057
Research Article

A Simplified Procedure for Base Sliding Evaluation of Concrete Gravity Dams under Seismic Action

1Department of Structural and Geotechnical Engineering, Sapienza University of Rome, Via A. Gramsci 53, Rome 00197, Italy
2Department of Structural Engineering, University of “Roma Tre”, Via C. Segre 4/6, Rome 00146, Italy

Received 3 March 2011; Accepted 29 March 2011

Academic Editors: J.-F. Chen and H.-L. Luo

Copyright © 2011 M. Basili and C. Nuti. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Possible base sliding induced by an earthquake on concrete gravity dams is obtained by a simplified procedure. The model is a nonlinear single-degree-of-freedom system which takes into account dam-water-foundation interaction based on the model developed by Fenves and Chopra (1987). The nonlinearity is in the foundation rock, since a threshold value for the sliding foundation resistance, modeled with the Mohr-Coulomb yielding criterion including a frictional and a cohesive component, is imposed. Nonlinear step by dams is obtained by a simplified procedure. The model is a nonlinear single-degree-of-freedom system which takes into account dam-water-foundation interaction based on the model developed by Fenves and Chopra (1987). The nonlinearity is in the foundation rock, since a threshold value for the sliding foundation resistance, modeled with the Mohr-Coulomb yielding criterion including a frictional and a cohesive component, is imposed. Nonlinear step by step dynamic analyses are carried out on four case studies representing typical examples of Italian concrete gravity dams by utilizing several natural earthquakes. On the basis of the obtained results, a simplified methodology to estimate residual displacement without performing nonlinear dynamic analysis is presented. An example of application using as seismic input the elastic response spectra furnished by the Italian Code is also presented.