为了探索波纹钢形状对加固盖板涵承载力的影响及填充混凝土的拱效应形成机制，采用室内试验与数值分析相结合的研究方法，以一个室内模型试验结果为基准，建立了72个箱形、圆弧及其之间的过渡形状的波纹钢加固盖板涵的数值模型，探明了加固体系承载力随波纹钢形状参数的变化规律；基于合理拱轴的概念，探明了填充混凝土的拱效应形成机理，并采用5个数值模型进行了验证。结果表明：拱腋半径保持不变时，加固体系的承载力随着拱顶、侧墙半径的增加而减小；拱顶、侧墙半径不变时，加固体系的承载力随着拱腋半径的增加而增大；提升加固体系承载力最有效的方式是增加拱腋半径，其次是减小拱顶和侧墙半径；填充混凝土的拱效应与荷载类型有关，当波纹钢的形状能保持拱轴连续并且在素混凝土刚性角以内时，加固体系的承载力最高。在设计波纹钢加固盖板涵结构时，应根据实际工程需要综合考虑波纹钢形状与填充混凝土的拱效应，尽量避免紧贴原盖板涵的加固设计。

To explore the influence of the shape of corrugated steel plate (CSP) on the reinforced concrete (RC) slab culvert rehabilitated with grouted CSP, and the discrimination of arch effect of grout, this paper established 72 numerical models of the rehabilitated system with box, arc and transition shapes of CSPs by combining laboratory test with numerical analysis, based on the laboratory experimental results. The variation law of the load-carrying capacity of the rehabilitated system changed with the shape parameters of CSPs was ascertained. In addition, based on the concept of reasonable arch axis, the formation mechanism of arch effect of grout was also ascertained and verified by five numerical models. The results indicate that, when the radius of the haunch of CSP remained constant, the load-carrying capacity of the rehabilitated system increases upon decreasing of the radius of side walls and crown; when the side walls and crown of CSP remained constant, the load-carrying capacity of the rehabilitated system increases with the increase of the radius of the arch haunches; the most effective way to improve the load-carrying capacity of the rehabilitated system is to increase the radius of the haunches, followed by reducing the radius of the vault and side wall. The arch effect of grout was related to the load types. When the shape of CSP can keep the arch axis continuous and within the rigid angle of grout, the load-carrying capacity of the rehabilitated system is the highest. The structural design of the RC slab culvert rehabilitated with CSP should comprehensively consider the shapes of CSP and the arch effect of grout according to the actual needs of the project, and try to avoid the rehabilitation design close to the original RC slab culvert as far as possible.