斜拉桥索力优化的强次可行序列二次规划法

提出了一种斜拉桥索力优化的实用方法-强次可行序列二次规划法. 该方法通过建立斜拉 桥索力优化的非线性规划模型，以主梁和索塔的弯曲应变能为目标函数，斜拉索的索力为设 计变量，结构应力和索力为约束条件，计入大跨度斜拉桥各种几何非线性因素的影响，采用 强次可行序列二次规划算法进行优化求解，确定斜拉桥成桥合理状态的索力. 运用该方法对 某斜拉桥进行索力优化，结果表明该方法简单、有效.

Strongly subfeasible sequential quadratic programming method of cable tension optimization for cable-stayed bridges

A practical optimization method (strongly subfeasible sequential quadratic programming method) of cable tension optimization for cable-stayed bridges is presented, with a model for nonlinear optimization programming to obtain the force in cables of cable-stayed bridge, in which the bending strain energy of the beams and cable tower of the bridge is the objective function, and the cable forces are the design variable, the stress in the structure or the cable force is the constraint condition. In order to determine the prestressing force of the cables, the influence of various geometrical nonlinearities is considered, and the strongly subfeasible sequential quadratic programming method is used to solve the program. This method is used to obtain the set of optimal cable tensions of a cable-stayed bridge using the spatial nonlinear finite element program. The result of analysis shows that the method is effective.