Cable Force And Structural Parameter Optimization And Cable Replacment Analysis Of Unusual Shape Single Cable Plane And Single Tower Cable Stayed Bridge

Based on the design of a130+85m unusual shape single cable plane and single tower cable stayed bridge,3D finite element models was established in this thesis by utilizing finite element software ANSYS and MIDAS Civil. Analysis of reasonable initial tensile forces of stayed-cables was conducted and an optimization model was established. Inspections of the optimization model under operation state and cable replacement analysis were also included in this thesis. A structural parameter optimization regarding tower angle, end anchored cable and the length of unsupported deck was conducted based on the optimization model. The main contents of this thesis are as follows:(1) Optimization of initial cable tensile force was conducted by using two different object functions. Comparison of different optimize methods was conducted by analyzing force, displacements and reaction forces of each model. A set of reasonable initial cable tensile force was proposed.(2) Based on the optimized model that established in part1, inspection of operation status was conducted regarding force, stress and displacements of tower, steel box girder and stayed-cable. Adjustment of cable areas was conducted based on the inspection. Analysis of stress and displacements of adjusted model was conducted.(3) A structural parameter optimization of single tower cable-stayed bridge based on model that established in part2was conducted. The variation of inner force, displacement and reaction forces regards the change of parameters such as tower angle, the set of end anchored cable and length of unsupported deck in main span were discussed in this thesis. At last, a reasonable tower angle and length of unsupported deck in main span was proposed.(4) Cable replacement status based on adjusted model that established in part2was analyzed. In order to determine the safety of single tower cable-stayed bridge, analysis of stress and displacement under dead and live load while replacing stayed-cable both individually and multiply was conducted. The variations of above-mentioned results were also discussed.