Title: STABILITY ANALYSIS OF BOX-GIRDER CABLE-STAYED BRIDGES
Abstract: The objective of this study is to investigate the stability characteristics of box-girder cable-stayed bridges by three-dimensional finite-element methods. Cable-stayed bridges have many design parameters, because they have many redundancies, especially for long-span bridges. Cable-stayed bridges exhibit several nonlinear behaviors concurrently under normal design loads because of large displacements; the interaction among the pylons, the stayed cables, and the bridge deck; the strong axial and lateral forces acting on the bridge deck and pylons; and cable nonlinearity. A typical two-lane, three-span, steel box-girder cable-stayed bridge superstructure was selected for this paper. The numerical results indicate that, if the ratio of the main span length with respect to the total span length is small, the structure usually has a higher critical load. If the ratio of the moment of inertia of the pylon with respect to the moment of inertia of the bridge deck (Ip/Ib) increases, the critical load of the bridge decreases. When the ratio Ip/Ib is greater than 10.0, the decrement becomes insignificant. For cable arrangements, bridges supported by a harp-type cable arrangement are the better design than bridges supported by a fan-type cable arrangement on buckling analysis. The numerical results also indicate that use of either A-type or H-type pylons does not significantly affect the critical load of this type of structure. In order to make the numerical results useful, the buckling loads have been nondimensionalized and presented in both tabular and graphical forms.
Publication Year: 2001
Publication Date: 2001-01-01
Language: en
Type: article
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Cited By Count: 11
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