Abstract: The arrangement of external prestressing steels is influened by various factors in the design ofbfidge strengthen，a kind of genetica1 gofithms based on real number encoding is used and target function is set to the section Rrea ofthe horizontal steels for solving the problem of suitable arrangement of external prestressing steels in this paper．

Key words: bridge strengthen, external prestressing stels, genetic algoritlmas, suitable arrangement

摘要： 在桥梁加固设计中，体外预应力筋的设置受多种因素的影响．笔者运用基于实数编码的遗传算法，以水平筋 的截面面积最小作为优化目标，提出体外预应力筋合理设置问题的优化方法．

关键词: 桥梁加固, 体外预应力筋, 遗传算法, 合理设置