关键词: 影响线, 对分迭代, 支点优选, 控制原则, 方法

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 ;