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Structural Engineering and Mechanics Volume 45, Number 5, March10 2013 , pages 703-722 DOI: https://doi.org/10.12989/sem.2013.45.5.703 |
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Concrete arch bridges built by lattice cantilevers |
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Michele Fabio Granata, Piercarlo Margiotta, Antonino Recupero and Marcello Arici
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| Abstract | ||
| In this paper a study about concrete arch bridges built by lattice cantilevers is presented. Lattice cantilevers are partial structures composed of deck, arch, piers and provisional steel diagonals, organized as reticular cantilever girders, in order to build arch bridges without the use of centrings, supports or temporary towers. Characteristics of this construction methodology with its variants are explained together with their implications in the erection sequence. Partial elastic scheme method is implemented in order to find initial forces of temporary cables and a forward analysis is carried out to follow the actual sequence of construction, by extending a procedure already applied to concrete cable–stayed bridges and to arches built by the classical suspended cantilever method. A numerical application on a case–study of a concrete arch bridge is performed together with a comparison between different methodologies followed for its construction sequence. Differences between erection by lattice cantilevers and cable-stayed cantilevers, are discussed. Results can be useful for designers in conceptual design of concrete arch bridges. | ||
| Key Words | ||
| arch bridge; lattice cantilever; partial elastic scheme; staged construction; cable-stayed | ||
| Address | ||
| Michele Fabio Granata, Piercarlo Margiotta and Marcello Arici: Universita di Palermo, DICAM, Viale delle Scienze, Palermo, Italy Antonino Recupero: Universita di Messina, DIC, Contrada Di Dio, Messina, Italy | ||