| The cable-stayed bridge is a modern bridge type in which the main beam is suspended on the cable tower through the cable stayed cable.Cable-stayed bridge has the characteristics of long-span and powerful structural rigidity with the lower costs.Based on the structural characteristics of Sutong Bridge,the following tasks were performed:1.In order to analyze the internal forces and deformation of the Sutong Bridge during the main construction process,a series of 3D finite element models of Sutong Bridge were developed according to different pylon heights and different side-to-mid span ratios.The distribution law of the girder load at the largest single cantilever stage is analyzed and the fraction of load supported by the cables and those by the pier supportors are investigated.2.According to the relationship between the vertical component of cable forces and the weight of the girder,the function of the cable to the main beam was reasonably simplified as the uniform load acting on the girder.Based on the precondition that the pylon should remain vertical under the effects of the cable forces,a simplified analysis model for cable-stayed bridges was proposed and the formulae for the calculation of bending moments at several key sections of the side-span girder was obtained.3.According to parameters variation that may be encountered in the construction of cable-stayed bridges,the girder weight and the tower height are selected as the sensitivity parameters.The internal forces and deformations of the girder after parameters change are calculated by the simplified analysis model and Midas/Civil FEM.The results of the two methods are compared and verified.4.In the process of the design for cable-stayed bridges,the mid-span ratio were selected as the variable parameter to evaluate the structural response of the key sections on the girder. |
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