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Author(s): Alípio Ferreira
Bernardo Lima
Pedro Torres
Rui Sousa
David Fernández-Ordónez
José Terra
Carlos Sousa
Title: Partially Precast Solutions for Medium Span Bridges: the Case of the Bridge Over the River Tâmega
Issue Date: 2006
Abstract: Various conditionings, such as crossing of rivers or crossing at a great height of places with bad foundationconditions, can determine the conception of bridges with span lengths in such a way that it is not practicableto build them with precast beams of the same length as the span. Indeed, beams longer than a certain limitvalue (normally 30 to 40 metres), are too long or too heavy, so that their transportation and erection are notfeasible. Some solutions to the construction of these bridges with precast beams have been found, being analternative for other construction methods, such as the balanced cantilever method.One possible solution may be the use of precast beams slightly less lengthened than the span, spliced aftererection. When this technique is used, the longitudinal beams placed upon the supports have, normally,variable height [1, 2, 3, 4, 5]. Another possible solution is the adoption of inclined columns, with a "V" or "Y"form [6, 7, 8]. Some authors used a different solution: the cable stayed bridge [6, 9]. Solutions with exteriorprestress (below the deck) have also been studied [10].This work presents the solution used in the bridge over the river Tâmega, in Northern Portugal (E3 branch ofthe Interior North SCUT - IP3). At the moment this bridge is under construction, according to the solutionpresented here (that is, indeed, an alternative to the initial plan simply supported composite steel andconcrete bridge deck with a 80m span). Due to hydraulic requirements, there must be a wide separationbetween the central columns of this bridge and the river banks. This fact makes it inevitable to form an 80 mcentral span.This article shows briefly the structural solution used in the construction of this bridge with precast beams.This work also justifies the structural conception and describes concisely the prestressing system and thesequence of construction adopted.
Source: The Second fib Congress
Document Type: Artigo em Livro de Atas de Conferência Internacional
Rights: restrictedAccess
Appears in Collections:FEUP - Artigo em Livro de Atas de Conferência Internacional

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