Abstract: The concept of eccentricity influence line was introduced to solve the design problems in the process of strengthening masonry arch bridge and loading the program , starting from the calculation method of the ultimate loading capacity for masonry arch bridges. And the influence lines and the stage-varied lines which ref1ected the variation of eccentricity were utilized as tools. Eventually , the reasonably strengthening sequence design method一-stage-varied line method was proposed , by controlling the eccentricity of the cross-section e , which should be less than allowable 0 1' pre-set value eo within all stages of the strengthening construction. In order to validate the method , a case study for strengthening sequence design of a 3 x 100 m concrete arch bridge was carried out.

Key words: strengthening sequence design, eccentricity influence line, stage-varied line method, arch bridge strengthening

摘要： 为解决巧T拱桥加罔过程中加固与加载程序设计问题，从坷丁-拱的极限承载力计算方法人子，引入了偏心距 影响线的概念，采用影响线与反映偏心距变化的阶线图作为工具，通过控制加固施士过程中截面合力偏心距e不超 过容许值e。或预设值，提出了大跨径均工拱桥合理加固次序的设计方法一一-阶线法。以一座3x100m混凝土箱 板拱桥的加固次序设计过程为例，检验了方法的可行性。

关键词: 加固次序设计, 偏心距影响线, 阶线法, 拱桥加固