By Jose O. Pedro

The current quantity offers a entire realizing of the fashionable standards, types and strategies of research of arch dams, for regular operation stipulations and lower than unparalleled a lot. this data is critical for all these eager about the review of the behaviour and of arch dams and different huge buildings, both for layout or tracking purpose.

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Swelling: the Bimont (France), Meantwrog (Great Britain), Corfino (Italy), Alto Ceira (Portugal), Poortjies-Klooj, Keerom, Pietersfontein, and Roode Elsberg (South Mrica), Cooper Basin, Gene Wash, Gibraltar, Matilija, and Stewart Mountain (USA) arch dams; the Churchil and Stompdrift (South Africa) multiple arch dams. - Shrinkage and creep: the Laouzas (France), Corfino, Montagna Spacata, and Nuraghe Arrubio (Italy), and Zervreila (Switzerland) arch dams; the Venina (Italy) and Churchil (South Africa) multiple arch dams.

I -I -I I ::· : Downstream -OOOOODO· .... // / / + + ........ - ..................... , Tension - - Compression 10MPa Fig. ), under normal operation conditions. The studies for this scenario have been carried out at LNEC by simulating a decrease of the concrete cohesion and have included arch dams of different dimensions and types, built in several countries. O. Pedro Among other dams, the studies developed at LNEC concerned (Rocha et al 1960, 1969, Azevedo et al 1979, Pedro et al 1985, 1989, 1989a, 1990, 1991, 1993, Silveira et el 1991, Pina et al1993): theA/to Ceira dam (Portugal), completed in 1949 (36m high, a crest length of 85 m); the Cabril dam (Portugal), completed in 1954 (131 m high, a crest length of 290m); the Boufii dam (Portugal), completed in 1955 (65 m high, a crest length of 175 m); the Slettedalen dam (Norway), completed in 1959 (72 m high, a crest length of 170m); the Cachi dam (Costa Rica), completed in 1966 (80 m high, a crest length of70 m); the Repulse dam (Australia), completed in 1968 (42 m high, a crest length of 433 m); the Murray II dam (Australia), completed in 1968 (43 m high a crest length of 131 m); the Mossyrock dam (USA), completed in 1968 (185 m high, a crest length of 502 m); the Saito Funil dam (Brazil), completed in 1969 (85 m high, a crest length of 385 m); the Cahora Bassa dam (Mozambique), completed in 1974 (171 m high, a crest length of 321 m); the Karoon dam (Iran), completed in 1975 (200 m high, a crest length of 380 m); and the Funcho dam (Portugal), completed in 1989 (49 m high, a crest length of 165 m).

7 times the gravitational acceleration having been recorded for the horizontal and vertical directions in the left bank, respectively. Only small disturbances were reported, namely the opening of the vertical joint between the arch and the left abutment, and a crack in the thrust block (Swanson and Sharma 1979). The good performance of arch dams under earthquakes has been also pointed out by the analyses of mathematical and scaled models made at LNEC. These studies concerned, among others: the Cachi (Costa Rica), Kalaritikos and Steno (Greece), Karoon and Tang-eSoleyman (Iran), Cahora Bassa (Mozambique), Alto Lindoso and Cabril (Portugal), and Mossyrock (USA) arch dams; and the large-span Aguieira multiple arch dam (Portugal) (Pedro 1977, Pedro and Pereira 1981, Camara 1989, Gilg et al1987).

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