Based on the existing algorithm and through ascertaining the influence matrix of the tensile force in the construction of oblique pulling rope,the optimized stayed-buckle cable force is calculated at each stage of archrib hoisting phase of a model bridge during construction and the designed requirement is fulfilled through empty steel tube in falling state.

Non-bracket and Cable erection is the main erecting arch ribs method of a long span concrete-filled steel-tube(CFST) arch bridge recently,but it requires to adjust the cable force over and over again,which increases the degree of construction difficulty and arch axis linear control trouble,delays the project limit time.

Research purposes: By summing up the advantages and disadvantages of using the torque balance method and the finite element "zero displacement method" to determine the cable force,the optimal calculation method is used for the Luobuxi Bridge to guarantee the linear accuracy in arch rib segment of the bridge and construction safety.

Taking Da-ning River Bridge in construction as the engineering background,the optimization analysis of cable forces and segmental cambers has been carried out during the process of arch rib segmental installment.

Based on the theory of Influence Matrix,with the constraint optimization and the positive disposition analyses as its core,the "Two Stage Method" which is used for the cable tension optimization on short or medium span cable-stayed bridges is proposed.

Mathematical model of cable tension optimization is set up.

A plane finite element calculation model is made for optimization of cable force by the stress-balance method.

Based on the Matlab optimization toolbox,this paper used internal force and geometry as control conditions,put forward a practical method of optimization of cable force for cable-stayed bridge.

The optimization of cable force in cable-stayed bridge is divided into the optimization of finised-stage cable force and construction-stage cable force.