| The span of modern cable-stayed bridge is longer and longer, making the structure more complicated and spatial effect is more apparent. The stress concentration of prestressed steel beam and cable anchor areas is obvious, subjected to analysis of plane finite element model is difficult to obtain the real mechanical response of the structure. To grasp the detail component force, in order to improve the design or construction procedures, to ensure safety, it is necessary to carry out the detailed calculation and analysis.This paper is to a certain mainspan730m long span cable-stayed bridge as the engineering background, the first to use MIDAS/Civil space construction stage of the whole bridge model is established, and the construction state and operating state tower, cable, beam to evaluate the safety, applicability, and providing the analysis of the finite element model for local entity unit force boundary conditions.Using ANSYS software, finite element models of the cable tower anchorage zone and lower pillar, side anchor beam are respectively established. Combined with cable tower construction steps, the structure and the prestressed anchorage zone configuration design content, such as considering the creep and shrinkage of concrete gravity structure, prestress, temperature difference effect, effect of live load, wind load effect under the action of analysis and study, such as the cable tower anchorage zone, principal stress size and distribution of normal stress; Combining with the construction procedure, structure layout, structure and the distribution of the prestressed structure, the structure stress analysis of working condition of each control to carry out the research on the pillar under the normal stress and principal stress distribution; Combination of the concrete beam on both sides of the construction procedure, construction and arrangement of prestressed structure, the main research:the stress distribution of anchor span girder space research; Anchor span box girders of dead load and live load vertical shear force transmission path; The shear lag effect of main girder. Girder longitudinal axial force diffusion. |
