遗传算法用于体外预应力筋的合理布置

Optimization of External Prestressing Tendons Based on Genetic Algorithms

运用基于实数直接操作的遗传编码算法 ,在考虑了影响体外预应力筋的合理布置的多项因素的基础上 (包括锚固点、滑块、水平筋等的位置以及斜筋、水平筋的数量等等 ) ,构造了求解体外预应力筋的合理布置问题的算法 .着重探讨了体外预应力筋合理布置的优化目标 ,为了最大限度地改善原有结构的受力情况 ,以体外预应力水平筋活荷载下的最大应力增量作优化的函数 .文中以一实例对其运算过程和结果进行分析 。

The prestressing technique using external tendons can be considered as an effective method of strengthening bridges. In order to obtain the suitable arrangement of external prestressed tendons, a method for global optimization of the strengthening system is proposed based on genetic algorithms (GAs) with such factors as the location of anchorage, slider, the prestressed tendons and their areas etc. For this application, the real number coding method is used and target function is set to the maximal increment of the stress in the horizontal tendons under live loads. A practical example is given and the result is discussed and compared with that using a different target function.