Page - 711 - in Book of Full Papers - Symposium Hydro Engineering

Anchored Structures in Service, November 26-27, London, England, U.K., 11 p. [2] BRUCE, D.A., AND J. WOLFHOPE (2007). “Rock Anchors for North American Dams: The Development of the National Recommendations (1974-2004),” Institution of Civil Engineers, Ground Anchorages and Anchored Structures in Service, November 26-27, London, England, U.K., 11 p. [3] BRUCE, D.A., J.S. WOLFHOPE AND J.D. WULLENWABER. (2013). “Rock Anchors for Dams: A Five-Year Update,” 33rd USSD Annual Meeting and Conference, Glendale, AZ, February 11-15, 10 pp. [4] POST TENSIONING INSTITUTE (PTI). (2014). “Recommendations for Prestressed Rock and Soil Anchors,” Farmington Hills, Michigan, December 8, 109 p. [5] LITTLEJOHN, G.S. AND D.A. BRUCE. (1977). “Rock Anchors - State of the Art.” Foundation Publications, Essex, England, 50 p. (Previously published in Ground Engineering in 5 parts, 1975-1976.) SUMMARY The evolution of practice in the design and construction of prestressed rock anchors for North American dams is described. This provides background to the problem of assessing the reliability of aging anchors, principally those installed prior to 1996. This review is based on the results of a study of over 400 case histories of projects completed since 1964. L’évolution de la pratique courante en conception et construction avec ancrages précontraints dans le roc pour les barrages nord-américains est décrite dans cet article. Il fournit le contexte du problème d’évaluation de la fiabilité des ancrages en service, majoritairement ceux installés avant 1996. Cette revue s’appuie sur plus de 400 études des cas des projets achevés depuis 1964. KEYWORDS Aging, anchorage, concrete dam, inspection, prestressing, risk assessment. Vieillissement, ancrage, barrage en béton, visite, précontrainte, analyse de risque. 711