Cable Force Optimization Of Low Tower Cable-stayed Bridge

The extradosed cable-stayed bridge is a new type of bridge structure developed in recent 30 years,and the research on its material characteristics,structural forms and theoretical research gradually becomes prefect.With Xinyanggang Grand Bridge as the engineering background,this paper analyzes the determination method of the rational cable force and rational construction state.The main research contents are as follows:(1)The model of the cable-stayed bridge is set up by using finite element software ANSYS and zero-order method is utilized to optimize the cable force of Xinyanggang Grand Bridge.The results of the internal force and linear of the main girder and main tower before and after the optimization indicates that it is feasible to use zero-order method to determine the rational cable force for extradosed cable-stayed bridge.(2)With the established cable-stayed bridge model,the paper uses free stress state control method to determine the reasonable construction state and get the cable-stayed bridge internal force state of each construction stage.Compared with target state,the internal force state of main girder and the main tower of actual completed bridge state have smaller difference within the allowable range.Therefore,it is reasonable and feasible to use this method to determine reasonable construction state of Xinyanggang Grand Bridge.