Research Of Main Tower Construction Control And Cable Force Optimum Of Nanyanghu Cable-stayed Bridge

With the characters of large span and good force performance of structure, it is a rapid developing period for cable-stayed bridge in bridge field recent years. The increase of the varieties of bridge has caused the difficulty of construction increasing, so it appears very important for construction control, especially, the research of cable force in optimum of reasonable finished dead state and rational construction state plays very important significance to rationality of cable-stayed bridge structure.On basis of Shenyang Nanyanghu Cable-stayed Bridge which is being builded, the implement of main tower construction and construction control of which is discussed, a simulative computation is realized of finished dead state and construction state, through the finite element analysis software MIDAS/Civil, and the questions of cable force optimum throgh reasonable finished dead state and construction state are decided with a comprehensive method and forward analysis method.Druing the implement of main tower construction control, analysis and explanation are done for determination of position and repetition measurement of stiffness skeleton, templet, especially determination of precise position of cable saddle.The standard of the reasonable finished dead state is determined. Initial cable force under dead load is determined by several methods, through comparing the advantages and disadvantages of these methods, the reasonable cable force of Nanyanghu Cable-stayed Bridge in the finished dead state by a comprehensive method is determined.Based on the division of construction stages of this bridge, each construction stage is simulated by the forward analysis method through the finite element software, then the cable force in each construction stage is determined, including their change order. And then the cable force time travel curve of the construction stage is drawed, in order to control the whole construction process.