在分析增大截面法加固石拱桥后受力情况的过程中，考虑了加固结构存在二次受力特点和联合结构不同材料的力学性能，通过对新增混凝土主拱圈与原块石砂浆主拱圈采用联合截面等效加固及采用刚性连接模拟的数值方法，同时与理论解进行了对比，探讨了两种分析方法的合理性与局限性，以供石拱桥加固设计时参考。%The paper takes second reinforcement structure stress features and mechanical performance of united structure with different materials in-to consideration in the process of analyzing stone arch bridge stress conditions after reinforcement with enlarging section method,applies united sec-tion equivalent reinforcement and rigid connection simulation for new major concrete arch circle and original mortar arch circle,makes a comparison with theoretical data,finally explores their rationality and limits,with a view to provide some guidance for stone arch bridge reinforcing design.
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