Research On Key Technology Of Cable Adjustment Of High And Low Tower Steel Truss Cable-stayed Bridge

For the steel truss cable-stayed bridge,if you want to get a better structure and internal force after the construction of the bridge,you must optimize the completion and construction of the steel truss cable-stayed bridge..Therefore,the question of how to optimize the construction state and rational completion state of the steel truss cable-stayed bridge is of practical engineering value.This paper relies on the Chongqing East Ring Line Mingyuexia Yangtze River Bridge as the engineering background,based on the structural characteristics of the high and low tower steel truss cable-stayed bridge combined with the actual construction method,combined with secondary planning,multiobjective optimization and finite element method,to determine the high and low tower steel truss The theoretical calculation method of the reasonably formed state and reasonable construction state of the cable-stayed bridge has been systematically studied.The specific research contents of this article are as follows:1.This article gives a general description of the history and development of the steel truss cable-stayed bridge,and gives a more detailed summary of the existing cable truss cable-stayed bridge force adjustment method and the reasonable construction stage cable force adjustment method to sum up.Introduces the basic mathematical optimization problems available in engineering,including quadratic programming,multi-objective programming and other optimization problems,expounds the basic method theory of quadratic programming problems,and such as Lagrange method,path tracking method and optimization problems Damping Newton method and other solving methods.2.This paper optimizes the cable force for the reasonable construction of high and low tower steel truss beams.Based on the bending energy of the upper and lower main truss and the main pylon of the high-low tower steel truss cable-stayed bridge and the design objective function,the vertical displacement of the upper chord displacement node and the horizontal displacement of the main pylon,the stress of the main truss and the main pylon,the axial force of the upper and lower main truss,The cable force of the stay cable and the uniformity of the cable distribution are determined as constraints.A quadratic programming model is established to determine the reasonable completion status of the steel truss cable stayed bridge with high and low towers.The solution method uses the convex optimization algorithm of path tracking;again,the method Combined with the finite element method to complete the completion optimization of the Mingyuexia Yangtze River Bridge;analyze the impact of changing the above constraints on the optimization of the bridge state.3.This paper optimizes the cable force during the construction process in a reasonable construction stage.Midas is used to iterate and select the difference between the construction process amount and the bridge formation amount as the multi-objective function to perform the optimization calculation.The variable parameters are used to select the tension of the stay cable construction during the construction process.The calculation method is mainly based on the damped Newton method in the optimization problem,and combined with the weighting method to convert the multi-objective into a single-objective solution.In the objective function,the cable force and the structural displacement bending moment of the construction process are mainly.In addition,a comparative analysis of single target and multiple target selection...