Title:
Presizing of Prestressed Concrete Launched Bridges
Author(s):
Marco Rosignoli
Publication:
Structural Journal
Volume:
96
Issue:
5
Appears on pages(s):
705-710
Keywords:
construction; prestressed concrete bridges; statistical analysis
DOI:
10.14359/723
Date:
9/1/1999
Abstract:
Incremental launching of a prestressed concrete bridge is a very com-petitive construction method for a wide range of bridge spans and sizes. During launching, the movement of the deck above fixed bear-ings produces temporary stresses that affect the bridge sizing and increase the cost of materials. Although materials are only a compo-nent of the overall cost of the deck and the costs associated with the particular construction method are often much more significant when comparing different alternatives, accurate cost pre-estimations can-not fail to take into account this tendency to oversize with respect to service requirements. A comparison of the main cross-sectional dimensions of bridges built by incremental launching and with other construction methods permits analysis of the technological implications, and data regres-sion may help in presizing new structures.