Abstract: Based on the theory that the influence line determines the location of the most unfavorable load of section internal force, the general and special control principles of fulcrum optimization of setting Y support as flat arch bridge reinforcement are analyzed. Combining with mathematical thought of bisection iterative method among numerical analysis, a new way to choose reasonable supporting point rapidly and conveniently is put forward, which provides primary theoretical basis and technical reference for the application of multi-point supporting to strengthening flat arch bridge, girder bridge and other bridges.

Key words: influence line , bisection iterative method , fulcrum optimization , control principle , method ;

摘要： 基于影响线确定截面内力最不利荷载位置的原理,分析了增设Y型支撑加固坦拱桥支点优选的总体与特殊 控制原则;并结合数值分析中对分迭代的数学思想,提出一种快捷、方便地选择合理支撑点的方法。为多点支撑加 固坦拱桥、及梁桥等其它桥型结构的应用提供首要理论基础及技术参考。

关键词: 影响线, 对分迭代, 支点优选, 控制原则, 方法