Seismic Analysis of a Roller Compacted Concrete Gravity Dam in Portugal

Abstract eng:
Some results of the seismic analysis of a gravity dam built in Portugal using the roller compacted concrete (RCC) methodology, with 52 m of height, are presented. The analysis was done using specific software (program EAGD-84) which, after some modifications to allow its use in the International System of Units (SI) and to obtain sequences of dependent variables along time, facilitates evaluating the seismic response of such dams. The analysis of the gravity dam as an elastic structure includes the dam-reservoir-foundation interactions, as well as the effect of absorption of the seismic waves by the sedimentary materials deposited in the reservoir bottom. The horizontal and vertical seismic actions are either synthetic artificial accelerograms satisfying design spectra or are registered real accelerograms scaled to the local peak accelerations; in this manner horizontal and vertical accelerations of the seismic action are considered, allowing the consideration of the base design earthquake (BDE) and maximum expectable earthquake (MEE). The results of the analysis include the nodal displacements and the stresses at selected elements, to assess the safety of this RCC dam structure.

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