Optimization Analysis of Cable Tensions for Suspension Erection of Long-Span CFST Arch Bridge

Function approximation combined with cybernetics is introduced into optimization of cable forces of Long-span CFST arch bridge with no fastening-tower, and with appliance of the idea of once-tension, minimizing the displacement difference of reference points taken as the optimization target, buckling cable force taken as design variable and reasonable constraints set up, relationship between measurable-controllable state variables of the structure and objective function is established. In order to save computation time, enhance optimization efficiency, and convenience error identification and parameter modification, cable force optimization is separated into parts that performed in every construction stage, and then alignment differences are modified and exterior loops are performed to ensure the alignment control. This method can take nonlinear effect into account and can effectively ascertain the cable forces and the precambers, so it will fit the demand of modern cybernetics and will be a generally suitable method for optimization.