Civil Engineering Association

Seismic behavior of box girder cable-stayed bridges considering large deformations

The main purpose of this study is to consider large deformations of the deck in response of long-span cable-stayed bridges during seismic excitations taking into account both kinds of geometric and material non-linearities. A 3D finite element model was developed. Large deformation beam elements with very low bending stiffness were used to model main supporting cables. The orthotropic deck was represented in the model with large deformation shell elements. Non-linear time history analyses using explicit approach were performed for a practical cable-stayed bridge subjected to different ground excitations considering ground motion spatial variation. In a parametric study the effects of the spatial variation in ground motions and cables’ post-tensioned forces on seismic response of the structure were examined. Results of time history analyses indicated that neglecting large deformations could lead one to overestimate the stiffness of the deck in some areas.

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here you go

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arshiakh

bridgeengineer