Study Of Cable Tension Optimization For Prestressed Concrete Cable-stayed Bridge With Single Pylon Single Cable-plane

In this paper, the Shayinghe Cable-stayed Bridge as an engineering background, to consider its main beam sub-segments with stents in-situ construction method of the characteristics of a prestressed concrete cable-stayed bridge construction control of Cable Force optimization problems.In this paper, forward iteration method is being used to control the main beam cross-section from top to bottom edge of the maximum and minimum stress as the objective function in order to optimize variables of the cable force, to establish the bridge model into the calculation of adjustments for a reasonable state of cable force. In order to obtain the ideal into a bridge cable force is required to consider an integrated main beam bending moment distribution uniformity, the main tower bending force, and the supporting piers reaction force, etc., it uses the influence matrix method for solving optimization problems, identify a reasonable cable force into the Shayinghe Cable-stayed Bridge.It uses the reasonable cable force for the first iteration bridge cable force, applies the forward iteration method with unknown load factors function to calculate the bridge state. Then the bridge state of the compared with the design value, for meeting the specified objective function under constraints, through the cable force optimization model calculate a new tension control parameters, and then proceed to the next round, until the calculation bridge state and the ideal bridge state in good agreement, to determine the initial construction cable forces of the Shayinghe Cable-stayed Bridge.According to the construction characteristics of the Shayinghe Cable-stayed Bridge-full space support sub-segmental construction, according to local conditions of the proposed cable-stayed the construction of the "second-step stretching method," because once a tensioned cable-stayed in place, the main beam is likely to partially was pulled, resulting in excessive internal forces of the local stress and unreasonable. Second-tensioned cable-stayed to meet the design requirements, eliminating the undesirable internal forces within the main beam, while ensuring the structural safety during construction. And it need no additional configuration of secondary tensioning operation, and it is relatively simple.