为了探索钢波纹板-叠合梁受力性能，依托湖南某旧桥加固工程，通过刚度等效的方法建立了等效矩形梁的数值模型并论述了应力换算方法，并在等效矩形梁模型的基础上分析了车辆荷载作用下结构受力特性与施工阶段的结构受力特性。与叠合梁模型对比发现采用等效矩形梁模型能够分析叠合梁结构受力，获得的截面边缘应力可根据本文公式换算成相应叠合梁的应力，除边界处应力误差较大以外其他点位的换算应力较为准确；活载作用下最不利工况发生在双后轴对称作用于拱顶情况，此时的弯矩与轴力最大，计算活载时应采用此工况；钢波纹板叠合梁结构施工速度较快，工期为4~5个月，施工过程中最不利情况为一侧回填产生偏心加载的情况，此时结构弯矩最大但轴力最小，施工结束后结构所受轴力最大，施工过程分析不能忽略这两种工况；CHBDC规范中的计算方法不适于钢波纹板叠合梁结构，需采用其他方法分析。

To explore the performance of Corrugated Steel Plate - Composite Beam Structure, based on an old bridge reinforcement engineering located in Hunan province, an equivalent rectangular beam numerical model was established through equivalent stiffness method, and the method of stress conversion was discussed. The properties of Composite Beam Structure under vehicle loads and construction period were analyzed by using equivalent numerical model. It is found that equivalent rectangular beam model can be used to analyze Composite Beam Structure, stress of equivalent rectangular beam can be converted to stress of Composite Beam Structure by the formula of this paper, stress of most points are the same except for the boundary of structure; the most unfavorable condition occur in the double rear axle symmetry acting on the vault, bending moment and axial force of structure is maximum in this condition, which need to be considered when calculated internal forces of structure under live loads; Composite Beam Structure has high construction speed, about 4~5 months construction period, the most unfavorable situation during the construction is the eccentric loading situation during backfilling, moment of structure is maximal and axial force is minimal at this time. At the end of construction, axial force of structure is maximal. These two conditions during the construction process cannot be ignored; CHBDC method is not suitable to calculate internal forces of Composite Beam Structure, which should be analyzed by other methods.