Cable Force Optimization And Construction Process Analysis Of A Long Span Concrete Cable Stayed Bridge

The Shuiyang river bridge is taken as the engineering background in this thesis.The optimization of the cable force for the final bridge as-built stage and construction stages is accomplished.The influence matrix method and the forward iteration method are used to determine the reasonable cable force for the bridge as-built stage,and construction stage respectively.The static,temperature induced responses,and stability during the construction process are analyzed.The middle construction cable force and the construction camber of the girder are also determined.The main research works of the thesis are as follows:1.The influence matrix method is used to determine the reasonable cable force of as-built bridge stage,and the final static force of the bridge is checked for the as-built bridge stage.The forward iteration method is used to determine the initial cable force of the construction stages,and the static force is also checked.2.The middle construction cable force is determined to ensure the reasonable stress state of the girder and the hanging basket.The influence of cable force on girder camber is analyzed,and the girder camber is also determined to ensure the bridge line shape.3.The construction process analysis of the Shuiyang river bridge is carried out.Several typical construction stages are selected to calculate analyzed.The stress state of the girders,the towers and the cables,are obtained to get change tendency of the construction process.4.The temperature induced responses of the girders and cables under global temperature effect are studied.Then,the temperature induced responses due to gradient temperature effect are also studied.5.Analyzed the stability of the bridge during the construction process.The stability influence due to structural design parameters is also studied.A typical construction stage is selected to analyze the geometric nonlinear effect on the stability analysis.