Three Main Truss Cable Plane Cable-stayed Bridge Space Cable Force Optimization

Based on the study of Tianxingzhou Bridge,a three cable-planes and three trusses cable-stayed bridge,in Wuhan-Guangzhou passenger dedicated lines,the tension force in cables has been optimized under the completed stage.The primary works completed are presented as follows:1.Based on the summary of the advanced research on the optimal theory and methods for cable tension force,it provides a theory basis for the cable tension optimization in this paper.2.By the application of the modern finite element software,a plane and spatial calculation model for this bridge has been established.On the basis of these two models,using the optimization design module in ANSYS,which is based on the first order optimization method,and then combining with the customer interface in ANSYS,taking internal force and structural line shape as the control condition,an APDL file to complete the calculation has been compiled.Finally,high-quality spatial and plane optimization calculation result is obtained fulfilling the control condition.3.Based on the application of the spatial model as well as optimal cable tension force,the connection among the three-cable-plane tension,the three main trusses displacement and the internal force in the three main trusses has been obtained.4.Through the comparison between the plane optimization result obtained by the first order optimization method and the result obtained with the impact matrix method, the efficiency and the reliability of method presented in this paper has been verified. Meanwhile,the advantage of the method in the thesis can be proved.By the comparison between the spatial results and the plane results,the applicability of two optimization means for the three trusses and the three cable-plane cable-stayed bridge has been completely discussed.