In this thesis, size effects on structural performance of concrete gravity dams subjected to near and far-fault ground motions are investigated including dam-water-foundation interaction. For this purpose, a benchmark problem proposed by ICOLD (International Committee on Large Dams) is chosen as a numerical application. Structural performance of the dam having five different heights is evaluated according to damage criterions in USACE (U.S. Army Corps of Engineers). It is decided according to their structural performance if non-linear analysis of the dams requires or not. The linear elastic dynamic analyses of the dams to near and far-fault ground motions are performed using the step-by-step integration technique. The integration time step is 0.0025 sec. The Rayleigh damping constants are calculated assuming 5% damping ratio. The program NONSAP modified for fluid-structure systems with the Lagrangian fluid finite element is employed in the response calculations.
This thesis consists of five chapters. In the first chapter, a literature survey associated with near-fault ground motion, structural performance criteria and linear-elastic material model used in this thesis is given in detail. This chapter also contains formulations associated with Lagrangian fluid finite elements and solution techniques used in the thesis. In the second chapter, a benchmark problem chosen as a numerical application and proposed by ICOLD (International Committee on Large Dams) is defined. In addition, finite element model of dam-water-foundation rock interaction systems prepared for the selected benchmark problem are introduced. Third chapter contains the findings obtained from the linear-elastic dynamic analyses. The conclusions and recommendations deduced from the analyses are given in chapter four. Finally, the references are presented in the fifth chapter.
Key Words: Concrete gravity dam, near-fault ground motion, far-fault ground motion, structural performance, linear-elastic dynamic analysis