Study On Cable Force Optimization Of Cable-stayed Bridge Construction Considering Nonlinear Factors

Cable-stayed bridges are widely used in the world because of their large span and simple shape.However,in the actual construction process,factors such as complex construction,long construction period and so on will cause some deviations beyond the design,and eventually lead to errors such as internal force,bending moment and displacement between the completed bridge state and the ideal design state.Therefore,it has theoretical value and engineering guiding significance to study the control of each parameter and the optimization of cable force in the construction process of cable-stayed bridge,so as to make the final completed state reach the ideal one.It is a new attempt and breakthrough to adopt the dynamic programming method.For the consideration of non-linearity,it is a supplement and improvement to the dynamic programming method,for the development of cable force optimization method of cable-stayed bridge,try a meaningful attempt and research.This is the main point.The prototype of this paper is Baoding Nanyan cable-stayed bridge sub bridge,which is shrunk by 1:40.Considering the design and manufacture of the model,the experimental research route of the cable-stayed bridge is proposed.According to the purpose of the experiment,the model of Nanyan cable-stayed bridge in Baoding city is properly simplified,and a practical model which can reflect the actual construction process of cable-stayed bridge and is oriented to the optimization of cable force in the construction process is designed.In this paper,the dynamic programming method is used to deal with the cable force optimization of cable-stayed bridge under the three nonlinear conditions of structural large displacement effect,beam column effect and verticality effect.The results of the dynamic programming method are compared with the experimental results of the laboratory cable-stayed bridge model,and the accuracy is further verified through the model test.The results show that compared with the results of multiple iterations and adjustments,the results of dynamic planning are relatively simple,and the results of calculation are more in line with the experimental results when considering the three non-linear effects of structurallarge displacement effect,beam column effect and verticality effect.This method has certain guiding significance for cable force optimization of cable-stayed bridges.