Abstract:The determination of the reasonable cable force of cable-stayed bridge is the key link in the design and construction of cable-stayed bridge, and obtaining the initial cable force conforming to the conditions is the foundation of establishing the finite element model of the bridge, completing the analysis of the construction stage and the monitoring of the construction cable force. The structure of special-shaped cable-stayed bridge is relatively complex, and its stress characteristics are different from that of conventional cable-stayed bridge. The traditional iterative method may not be applicable, and the iterative method needs to carry out several trial calculations, so the process is more complicated. The particle swarm optimization can obtain the reasonable bridge state efficiently and conveniently, and realize the automation and intelligence of cable force optimization. In order to verify the feasibility of the cable force optimization method combined with particle swarm optimization, a three-dimensional finite element model is established on the background of a special-shaped cable-stayed bridge project. Combined with the influence matrix method and particle swarm optimization, a MATLAB program is wrote to solve the initial cable force of the bridge stayed cable, and compared with the optimization results of the traditional iterative method, the feasibility of the method is verified. The results show that the traditional iterative method has the limitations in the optimization of special-shaped cable-stayed Bridges with complex structures. The optimization method of cable force based on the influence matrix and particle swarm optimization can be used to automatically solve the initial cable groups of special-shaped cable-stayed bridges with complex structures. The optimization process is simple and efficient.
