ABSTRACT
ABSTRACT: An extradosed prestressed bridge is a girder bridge that is externally prestressed, using stay cables over a portion of the span. Extradosed prestressed bridges can provide an economical bridge solution for spans in the transition range from conventional girder bridges and cable stayed bridges. This paper discusses initial proportioning guidelines for this bridge type, based on work by the author in developing the design for the first extradosed prestressed bridge in the US, the Pearl Harbor Memorial Bridge in New Haven Connecticut, and from reviewing over 60 extradosed prestressed bridge designs world-wide. Propositioning guidelines are discussed for items such as efficient span layouts, depth ratios for the deck, tower height, efficient span ranges, and stay layouts. The paper also addresses strength and fatigue design guidelines for the stay cables that are specific to the extradosed bridge type. The results of these guidelines are demonstrated with respect to the design for the Pearl Harbor Memorial Bridge.
