Plane Equivalent Algorithm And Its Application In Construction Control For Cable-stayed Bridges With Space Cables

The development of super long-span cable-stayed bridges inevitably accompanies the continuous improvement of design,construction and operation and management.The finite element analysis of cable-stayed bridges is an important means to ensure smooth implementation of the above work.In this paper,through the practical engineering,the equivalent plane finite element algorithm of cable plane,the method of cable-stayed bridge and the calculation of construction control of the super long-span cable-stayed bridge are researched.According to the actual working principle and mechanical properties of the structure,,A corresponding solution is put forward and the solution theory of equivalent cable for parallel cable calculation is established,and the program is verified for verification.A cable-stayed bridge cable transfer method based on stress-free configuration is proposed and applied in practical engineering,mainly The research contents and related achievements are as follows:Establishment of cable-stayed bridge transfer method based on stress-free configuration control method:Based on the idea of no-stress configuration control method,the design configuration is taken as the goal of bridge construction,the length of stress-free cable is used as the tension control parameter to solve the stress-free configuration iteration,and a set of construction control The tension and solving process are all automatically calculated by the program.The process is repeated iterative process,and the structure nonlinear effects and creep and shrinkage effects are fully taken into account.Therefore,the accuracy of the calculation results is high,Jiayu Yangtze River Bridge construction process of calculation and analysis of the application.The results show that this method can greatly facilitate the solution of the control tension in the process of cable-stayed bridge construction.The results are in good agreement with the design results and avoid the repeated trial calculation process.The establishment of space plane cable-stayed bridge finite element plane equivalent algorithm:In order to simplify the calculation model in the whole construction process of cable-stayed bridge with spatial cables and ensure the calculation accuracy.A cable anchorage displacement model of plane equivalent calculation model of spatial stay cables is constructed by using the spatial rigid arm and the stay cable co-rotational coordinate system.Then the equivalent equations of cable displacements and element forces are established.Both the plane equivalent element stiffness matrix of spatial cable element and its converted transfer matrix are deduced.When all the cables of a bridge stay in a parallel plane,the matrix also automatically degenerates into a plane cable element model with rigid-arms.Finally,based on this equivalent algorithm,the spatial characteristic parameters of spatial cable plane of cable-stayed bridges are defined.The influence of spatial cable plane on the internal forces and deformations of a cable-stayed bridge are analyzed in a numerical example.The application in an actual bridge validates the great convenience and practicability of the algorithm.Based on the adaptive stress-free configuration control method,the whole process of construction of the super-long-span hybrid cable-stayed bridge was analyzed.Based on the stress-free configuration calculation theory,the full bridge of Jiayu Yangtze River Highway Bridge was modeled.The stress state of the structure in the typical state of the construction process is analyzed,and the stress-free cable length and the cable force sensitivity of the space stay cable are analyzed.The corresponding conclusions are summed up to guide the actual construction process so as to improve the construction control accuracy.