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Parametric Study on the Structural Characteristics of Extradosed PSC Box Girder Bridges
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 Title & Authors
Parametric Study on the Structural Characteristics of Extradosed PSC Box Girder Bridges
Chung, Jee-Seung; Jeon, Jun-Chang; Park, Jin-Seok;
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In this paper, structural characteristics for an extradosed prestressed concrete box girder bridge are investigated in terms of selective parameters. These parameters are mainly associated with the structural details of the extradosed bridge and derived from currently available literatures regarding previous design drawings. The analyses have been carried out using general-purpose structural analysis program, RM-Space Frame. The parameters evaluated for the present study represent the most salient features of the extradosed bridge and are as follows; 1) span length ratio(side-span length to center-span length), 2) boundary condition of girder, 3) height of pylon, 4) anchorage location of external cables and 5) girder stiffness. The analytical predictions indicate that span length ratio and pylon height are reasonably adequate in the range of 0.55 to 0.60 and to respectively for the bridge under consideration. Also, demonstrated is the boundary condition of girder, in which rigid-connection details give more efficiency than the continuous details. In addition, considering structural characteristics of the extradosed bridge, it is desirable that the girder stiffness should be determined by the stress range of external cables rather than bending moment of girder.
extradosed bridge;structural characteristics;parametric study;
 Cited by
J. Mathivat, "Recent Development in Prestressed Concrete Bridges", FIP Note, 1988.

M. Komiya, "Characteristics of PSC Box Girder Bridges with Large Eccentricity and Its Design", Prestressed Concrete, Vol. 39, No. 2, pp.40-52, 1997.

Japan Prestressed Concrete Institute, Guideline for Design and Construction of PSC Cable Stayed Bridges and Extradosed Bridges, 2000.

User's Manual, RM-SPACE FRAME -Static, Dynamic and Geometric Non-Linear Analysis of Space Frame-, TDV, 1999.

N.J. Gimsing, Cable Supported Bridges, John Wiley & Sons, p.150, 1983.