Resumo

ESPINOZA FIGUEROA, Darío  e  ESTEVA MARABOTO, Luis. RELIABILITY FUNCTIONS AND SEISMIC PERFORMANCE OF CONCRETE DAMS. Ing. sísm [online]. 2021, n.106, pp.1-30.  Epub 18-Mar-2022. ISSN 0185-092X.  https://doi.org/10.18867/ris.106.579.

In this paper, the application of the principles of structural reliability for the estimation of the probability of failure in concrete dams is presented. Limit state functions were established for cracking in the body of the dam and the sliding of its base with respect to the foundation. The concept of the secant stiffness reduction index presented by Esteva et al. (2011) was used as a measure of the global stiffness degradation of the dam due to the presence of cracking. The structural response and the state of cracking in the body of the dam were obtained from a two-dimensional model of finite elements (MEF2D), considering a non-linear behavior in the concrete. The sliding was evaluated through the results of the MEF2D model and from a Rigid Body (MCR) model, considering the spatial variation of cohesion and the friction angle in the contact zone of the base. The seismic intensities leading to collapse (failure intensity) were obtained through an incremental dynamic analysis (IDA), scaling the seismic records not only in terms of intensity but also in frequency content, using the hybrid earthquake simulation method proposed by Ismael and Esteva (2006). Finally, the comparison of the reliability functions and the fragility curves of the failure modes is presented.

Palavras-chave : seismic failure intensity; concrete dams; reliability functions.

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