30 1A · 2010 1 − 1 −

30 1A·2010 1
Analytical Study of Geometric Nonlinear Behavior of Cable-stayed Bridges
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Abstract
This paper presents an investigation on the geometric nonlinear behavior of cable-stayed bridges using geometric nonlinear
finite element analysis method. The girder and mast in cable-stayed bridges show the combined axial load and bending
moment interaction due to horizontal and vertical forces of inclined cable. So these members are considered as beam-column
member. In this study, the nonlinear finite element analysis method is used to resolve the geometric nonlinear behavior of
cable-stayed bridges in consideration of beam-column effect, large displacement effect (known as P-δ effect) and cable sag
effect. To analyze a cable-stayed bridge model, nonlinear 6-degree of freedom frame element and nonlinear 3-degree of free-
dom equivalent truss element is used. To resolve the geometric nonlinear behavior for various live load cases, the initial shape
analysis is performed for considering dead load before live load analysis. Then the geometric nonlinear analysis for each live
load case is performed. The deformed shapes of each model, load-displacement curves of each point and load-tensile force
curves for each cable are presented for quantitative study of geometric nonlinear behavior of cable-stayed bridges.
Keywords : cable-stayed bridge, geometric nonlinear analysis, large displacement effect, beam-column effect, equivalent truss
element

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*· · (E-mail : rocksmell@korea.ac.kr)
**· · (E-mail : piridin@korea.ac.kr)
***· (E-mail : kkim@cju.ac.kr)
****· · · (E-mail : yjkang@korea.ac.kr)
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Sorensen, Inc., Vol 1, 2 and 3. Version 6.5.
(: 2008.11.25/: 2009.2.9/: 2009.9.12)