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Analysis of irreversible displacements of Daniel-Johnson dam
Large arch dams often exhibit irreversible displacements several years after their construction. Monitoring and estimating the rate of these displacements is of interest in developing accurate models for the behavior of the dam for safety purposes. Statistical analyses are traditionally used to estimate rates of irreversible deformations from monitoring data such as pendulum displacements. However, linear regression requires some assumptions relative to the form of the models and cannot distinguish between the contributions from the various sources of irreversible displacements. Multivariate statistical analysis procedures are proposed as a complement to linear regression analysis. The proposed methods offer the advantage of being nonparametric and can be used to analyze components of displacements from several instruments simultaneously and identify components of behavior that are highly correlated across the entire structure. The procedure is presented and applied to the analysis of the displacement data for a multiple arch dam. The method identifies the principal modes of deformation of the dam associated with thermal, reservoir and irreversible effects. This procedure was successful in separating two types of irreversible displacements, one associated with the reservoir level (creep) and one associated with a time (mild swelling of concrete; thermal damage). Results are presented for the buttresses and the arches of the dam.
Analysis of irreversible displacements of Daniel-Johnson dam
Large arch dams often exhibit irreversible displacements several years after their construction. Monitoring and estimating the rate of these displacements is of interest in developing accurate models for the behavior of the dam for safety purposes. Statistical analyses are traditionally used to estimate rates of irreversible deformations from monitoring data such as pendulum displacements. However, linear regression requires some assumptions relative to the form of the models and cannot distinguish between the contributions from the various sources of irreversible displacements. Multivariate statistical analysis procedures are proposed as a complement to linear regression analysis. The proposed methods offer the advantage of being nonparametric and can be used to analyze components of displacements from several instruments simultaneously and identify components of behavior that are highly correlated across the entire structure. The procedure is presented and applied to the analysis of the displacement data for a multiple arch dam. The method identifies the principal modes of deformation of the dam associated with thermal, reservoir and irreversible effects. This procedure was successful in separating two types of irreversible displacements, one associated with the reservoir level (creep) and one associated with a time (mild swelling of concrete; thermal damage). Results are presented for the buttresses and the arches of the dam.
Analysis of irreversible displacements of Daniel-Johnson dam
Analyse irreversibler Verlagerungen des Daniel-Johnson-Dammes
Chouinard, L. (author) / Cote, P. (author) / Lariviere, R. (author)
2009
6 Seiten, 11 Bilder, 2 Tabellen, 9 Quellen
Conference paper
English
Daniel Johnson. January 3, 1832
| TIBKAT | 1832
Contribution to study of irreversible displacements recorded in concrete dams
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Manic 5 : The building of the Daniel Johnson Dam
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Injection of Arch 5-6 of Daniel-Johnson Multiple Arch Dam
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