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A platform for research: civil engineering, architecture and urbanism
Modeling prestressed foundations for overhead line towers
The paper presents the concept of prestressed foundations for overhead line towers which are subject to uplift, compressive loads and/or overturning. Tests have been carried out in the centrifuge, under forced vibrations at fixed frequencies for different force excitations. The comparative analysis conducted in the centrifuge has shown that the gravity foundation worked correctly when subject to low amplitude of motions and the pile foundation presented a more stable mechanical behaviour. But when subjected to greater motion excitations, the pile foundation would fail at a given loading threshold. Finally the prestressed foundation using prestressing anchoring devices have shown the predicted best mechanical behavior and this for different loading intensities. This centrifuge simulation offers the great advantage of suggesting a ready choice either of excitation or prestressing force within the stability domain of the prestressed foundation where the mechanical behavior is quasi elastic. The prestressing force hardens the soil, thus increasing the elastic soil modulus and decreasing the settlements induced within the foundation by the service loadings.
Modeling prestressed foundations for overhead line towers
The paper presents the concept of prestressed foundations for overhead line towers which are subject to uplift, compressive loads and/or overturning. Tests have been carried out in the centrifuge, under forced vibrations at fixed frequencies for different force excitations. The comparative analysis conducted in the centrifuge has shown that the gravity foundation worked correctly when subject to low amplitude of motions and the pile foundation presented a more stable mechanical behaviour. But when subjected to greater motion excitations, the pile foundation would fail at a given loading threshold. Finally the prestressed foundation using prestressing anchoring devices have shown the predicted best mechanical behavior and this for different loading intensities. This centrifuge simulation offers the great advantage of suggesting a ready choice either of excitation or prestressing force within the stability domain of the prestressed foundation where the mechanical behavior is quasi elastic. The prestressing force hardens the soil, thus increasing the elastic soil modulus and decreasing the settlements induced within the foundation by the service loadings.
Modeling prestressed foundations for overhead line towers
Modell von vorgespannten Fundamenten für Freileitungsmasten
Luong, M.P. (author)
1991
8 Seiten, 16 Bilder, 1 Tabelle, 14 Quellen
Conference paper
English
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