摘   要：通过结构计算分析了波形钢腹板组合箱梁桥横梁，针对横梁裂缝宽度超限、承载能力不足的问题，提出增设预应力钢束和增加特殊支座及预应力钢束的两个加固方案。对横梁加固方案进行了计算，分析加固横梁应力和抗裂性指标，分析结果表明，横梁加固方案二从根本上解决了横梁存在的问题。最后从计算结果、施工难度与工作量、钢束锚固等因素考虑，选取了增加特殊支座及预应力钢束的横梁加固方案。

Abstract: The beams of composite box girder bridges with corrugated steel web are analyzed by the structure calculation, and according to crack width overrun of the beam and insufficient bearing capacity, the reinforcement schemes of adding prestressed steel beam or adding special bearings and prestressed steel beam are put forward. Meanwhile, the reinforcement schemes for the beam are calculated, and the indexes of stress and crack resistance of the reinforcement beams are analyzed. The results show that the reinforcement schemeⅡ can radically solve all the problems of the beam. In addition, considering some factors such as the calculation results, construction difficulty, workload, steel beam anchorage, it’s suggested that the schemes of adding special bearings and prestressed steel beam should be selected.