Cable Force Optimization Of Prestressed Concrete Cable Stayed Bridge

With the rapid development of cable stayed bridge in the world,the calculation theory of the bridge is increasingly improved.When the main beam,tower and the cable arrangement are designed,the reasonable condition of the cable stayed bridge is determined.So far,there have been a variety of cable force optimization method.This paper takes Yongning Yellow River Bridge as the engineering background,researched the application of influence matrix method in the cable optimizing of completion state.Through consulting a variety of cable force optimization theory literature material,stated the application structure of various optimization theory,advantages and disadvantages,meanwhile the basic theory of the influence matrix method and the internal force balance method is introduced in detail.This paper established the finite element model of the Yellow River bridge,Through the analysis of stress and deflection,puts forward a new idea of optimization of constraint conditions.Then the cable forces were optimized and adjusted for several times Combined with the influence matrix method and the internal force balance method.The result showed is effect.The simplified calculation method of the interim cable forces is introduced.But it is not good enough to use that method in an actual engineering project,the cable-supported form travelers bear more heavy load because of the increase cable force and its stress is more complicated.This paper takes a method of combining the finite element analysis and the simplified calculation of statics.Firstly,calculate the range of the middle cable force using the method of dynamics and get the average of the range.secondly,use the average in the finite element model,check the stress of cable-supported form travelers and the beams have been completed.In the end.,adjust the cable forces that are not appropriate.By optimizing the cable force of the bridge,the rationality of the design of the cable force is checked.It provides a foundation for determining the reasonable construction state.The calculation results of the interim cable forces could provide the basis data during the construction of the Yellow River Bridge,and could provide reference for the future works.