Nose-Deck Interaction in Launched Prestressed Concrete Bridges
Publication: Journal of Bridge Engineering
Volume 3, Issue 1
Abstract
Incremental launching is a competitive construction method for medium-span prestressed concrete bridges. Compared with the other techniques for in situ casting, in short bridges it is an alternative to the use of falseworks and reduces the cost of labor with the same investment. In longer bridges it is an alternative to self-launching centering and reduces investment with the same cost of labor. Compared with segmental precasting, it may reduce both investment and the cost of prestressing. The design of a launched bridge is affected by temporary stresses arising from its movement over fixed bearings. These stresses tend to increase the cost of materials, reducing the competitiveness of the construction method. Of the various devices used to reduce temporary stresses, adopting a launching nose has virtually become standard, permitting an effective control at competitive costs. The techniques of optimizing the nose-deck interaction are illustrated here through several graphs, and the analysis of special cases may be carried out by means of an ordinary spreadsheet.
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References
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Baur, W.(1977). “Bridge erection by launching is fast, safe and efficient.”Civ. Engrg., ASCE, 47(3), 60–63.
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Breen, J., and Naaman, A. (1990). External prestressing in bridges. American Concrete Institute, Detroit, Mich.
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Rosignoli, M.(1997b). “Influences of the incremental launching construction method on the sizing of prestressed concrete bridge decks.”Proc. Instn. Civ. Engrg.—Struct. and Build., 122(3), 316–325.
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Copyright © 1998 American Society of Civil Engineers.
History
Published online: Feb 1, 1998
Published in print: Feb 1998
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