Nonlinear seismic response of arch dams considering joint opening effects and boundary conditions of discontinuous foundation

Abstract

In most cases, concrete arch dams in the presence of suitable abutments, have high bearing capacity and more appropriate safety regarding the cost aspects, when compared to the other types of dams. However, according to the dam failure statistics, site specific conditions and abutment instability are the main factors of concrete dam's failure. In this paper, the effects of two important factors on earthquake response of high arch dams are considered. These factors are: effects of contraction joints opening between the dam monoliths and appropriate rock foundation boundary conditions. Nonlinear seismic response of dam reservoir foundation system includes dam-canyon interaction, dam body contraction joint opening, discontinuities (sliding planes) of foundation rock and failure of the jointed rock and concrete materials. Therefore, a finite element program for nonlinear dynamic analysis of 3D dam reservoir foundation system was developed. Karun 4 Dam as a case study was analyzed and the results revealed the essential role of modeling discontinuities and boundary conditions of rock foundation under seismic excitation. Also, The results demonstrate that the contraction joint openings during strong earthquakes are substantial and greatly change the arch to cantilever stress distribution in the dam body.

Effect of Dam–Rock Foundation Interaction Modeling on the Modal Ratio-Related Quantity of Beni Behdel and ‘El Mefrouch Multi-Arch Dams

“…In the design and safety analysis of the dam structures, the dynamic dam-foundation interaction is crucial. Numerous computational techniques, such as rigid, massless, and massed foundation models, have been employed to investigate the dynamic dam-foundation interaction [5,10,16,18,20,21]. Using large foundation models is not necessary, A massless foundation model, in which only the impacts of foundation flexibility are taken into account, was put forth by Clough et al in the 1970s [7].…”