Dynamic Response of Arch Dams with Foundation Interaction

• Type: Chapter or Part of a Book
• Date: 1994

Authors

Raimundo Delgado (Author) FEUP; Rui Faria (Author) FEUP

Book

Title: Soil-Structure Interaction: Numerical Analysis and Modelling

Pages: 167-193

Scientific classification

FOS: Engineering and technology > Civil engineering

Other information

Resumo (PT): The analysis of arch dams, due to their complexity, dimensions and responsibility, must be carefully performed, so that safety can be assured when earthquakes occur. The behaviour of this type of structure is strongly dependent upon the soil deformability and the reservoir characteristics, particularly when dynamic effects are considered. Thus, the threefold interaction between dam, foundation and reservoir must be accounted for in the structural analysis. The main scope of this chapter is to present the principal aspects of the numerical dynamic analysis of arch dams including the dam-foun-dation-reservoir interaction. Numerical modelling aspects of arch dams, foundation and reservoir are described, as well as how to join the three sub-domains together. Two alternative techniques are presented for solving the dynamic equilibrium equations, namely direct integration and modal superposi-tion. Their fields of application are discussed and the dynamic effects of seismic action are studied with special care. How to consider the seismic input is discussed and the influence of the foundation in the earthquake response is analysed in a practical application. Seismic input spatial variability is also included in the model. Com-parisons are made between the earthquake responses when the seismic input is considered to impose identical ground displacements at all the structure--foundation interface nodes, or when it travels along the foundation.

Abstract (EN): The analysis of arch dams, due to their complexity, dimensions and responsibility, must be carefully performed, so that safety can be assured when earthquakes occur. The behaviour of this type of structure is strongly dependent upon the soil deformability and the reservoir characteristics, particularly when dynamic effects are considered. Thus, the threefold interaction between dam, foundation and reservoir must be accounted for in the structural analysis. The main scope of this chapter is to present the principal aspects of the numerical dynamic analysis of arch dams including the dam-foun-dation-reservoir interaction. Numerical modelling aspects of arch dams, foundation and reservoir are described, as well as how to join the three sub-domains together. Two alternative techniques are presented for solving the dynamic equilibrium equations, namely direct integration and modal superposi-tion. Their fields of application are discussed and the dynamic effects of seismic action are studied with special care. How to consider the seismic input is discussed and the influence of the foundation in the earthquake response is analysed in a practical application. Seismic input spatial variability is also included in the model. Com-parisons are made between the earthquake responses when the seismic input is considered to impose identical ground displacements at all the structure--foundation interface nodes, or when it travels along the foundation.

Language: Portuguese

Type (Professor's evaluation): Scientific

No. of pages: 27