Spatial nonlinear cable force optimum for a prestressed concrete cable-stayed bridge under permanent loads

In this paper,a model for spatial nonlinear optimization programming to obtain the prestresses of cables in the cable-stayed bridge is established,in which the bending strain energy of the beams for the bridge and the cable tower is the objective function,and structural stresses and the cable forces is the constraint condition.In order to determine the prestresses of the cables of the bridge,the first order optimization method is used to solve the program.This method is used to obtain set of optimal cable tensions of a longspan prestressed concrete cable-stayed bridge under permanent loads,the result of analysis showed that the method is easy to apply and effective.