Taking the prestressed concrete continuous box girder widening reconstruction project as the example, the study adopts Midas FEA finite element software to establish new and old bridge models, analyzes the influence of some factors, such as the shrinkage, creep, and foundation settlement, on the internal stress of bridge structures in the old bridge widening reconstruction projects, so as to direct the construction design for similar projects.%以预应力混凝土连续箱梁桥拓宽改造工程为例,采用Midas FEA有限元软件建立新旧桥梁模型,分析研究在旧桥拓宽改造工程中收缩、徐变、基础沉降等因素对桥梁结构内力的影响,对类似工程的施工设计有一定的指导意义。
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