New PDF release: Arch Dams: Designing and Monitoring for Safety

By Jose O. Pedro

ISBN-10: 3211831495

ISBN-13: 9783211831496

ISBN-10: 3709124883

ISBN-13: 9783709124888

The current quantity presents a finished knowing of the fashionable standards, types and strategies of research of arch dams, for regular operation stipulations and lower than remarkable a lot. this data is necessary for all these fascinated with the overview of the behaviour and of arch dams and different huge buildings, both for layout or tracking purpose.

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Extra resources for Arch Dams: Designing and Monitoring for Safety

Sample text

It is, however, very heterogeneous, because the data were reported by different authors (with their own criteria), the respective dams were built in different periods and regions, and they were built with different dimensions, purposes, and monitoring systems. 5%) is smaller than that for other concrete dams and it represents, in average, one accident per year for 200 arch dams. 8%) (1) At the end of 1975 (2) Including accidents (global failure, affecting the safety) and incidents (punctual failure, affecting the performance) (3) Not including failures due to study purposes, bombing, etc.

Prestressing of the arches by tendons and flat jacks has also been used (Serafim 1973, Serafim and Clough 1990). For the upcoming roller compacted concrete arch dams, new construction techniques, as well as appropriate dam shapes, will certainly be required. 1 - The evaluation of the reliability of arch or multiple arch dams for some typical scenarios is illustrated by a few examples, selectedfrom studies carried out at LNEC. Safety and Performance of Arch Dams 53 The studies undertaken at LNEC have used mathematical and scaled models and concerned a large number of concrete dams (PNCOLD 1992, Pedro et al 1992).

7) was made by means of different mathematical models (Pedro and Camara 1986, Pina et al 1990). The results obtained were checked with in-situ tests of small forced vibrations, applied by means of an eccentric mass vibrator (Pedro et al 1986). The evaluation of the dam behaviour under strong earthquakes was subsequently made by step-by-step analyses of the so calibrated models The seismic action was defined by acce/erograms, derived from the power spectra adopted in the Portuguese Regulations (RSA 1984).

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Arch Dams: Designing and Monitoring for Safety by Jose O. Pedro


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