Three-Dimensional Seismic Response Analysis for a Rockfill Dam

摘要

Understanding the dynamic behavior of a dam against seismic load is important to determine its safety requirements. Complex dam–reservoir–foundation system interactions must be considered when evaluating the seismic behavior of a rockfill dam. The interactions are coupledwith the hydrodynamic pressure generated from seismic forces. This paper presents the dynamic analysis of the Temenggor rockfill dam with foundational effects by considering the dam’s connection with the reservoir bed and water. ANSYS? was used to create a 3D numerical model of thedam. Incompressible fluid and foundation were assumed for both cases of fixed and bedrocks. Various proportions were assumed for the elasticity module to analyze the complete dynamic interactions between the dam and the reservoir. The generated results from ANSYS for multiple frequencies provedto be excellent. Analysis results showed that the ranges of stress increased from 97% to 99.8%. Adding the water effect to the model decreased the natural frequencies of the system and increased the stresses on all boundary condition assumptions (fixed, shallow, and deep rock foundation) atdifferent percentages but helped stabilize the mode shapes.