| The separated beam-and-slab decks are used widely in the large span prestresed concrete cable-stayed bridge. Because the intervals of two side girders are relatively large in the structure, except the holistic distortion, transverse bend and lengthways-uneven local deformation of the panels are produced at the same time. Only nonlinear space analysis that considering above deformation accord with the reality working condition of such cable-stayed bridge. The paper has studied it over all. In this paper, special finite element method and ANSYS software is used to build the whole large span prestresed concrete cable-stayed bridge space model. ANSYS parametric design language and the virtual temperature loads methods are used to adjust the tension force in the cable, which unites the computing models before and after adjusting cables, and conveniently takes the influence of all kinds of nonlinear factors into account. In this paper, north branch main channel beam-and-slab decks cable-stayed bridge of Jingzhou Yangtze River Bridge is selected as an example. After analyzing spatial force bearing under several different loading cases, we get the bearing properties of cable and tower and the state of stress's distribution. The stiffness of the cross beam which influence the deformation and shear lag is discussed and an effective measre to improve the stress performance of the decks is put forward in this paper. The paper is also discussed the effect of the size of selected area and boundary conditions when a partial model is analyzed. Some important conclusions were drew, which offered a gist for precise analysis when a partial model method is used.
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