注浆式榫槽接头作为干式连接装配式车站结构中承载性能的关键组件，其工作状态的准确判定对装配式结构设计至关重要。本研究以注浆式榫槽接头为研究对象，基于多种类型接头在关键受力方向上的1∶1原型加载试验结果，开展不同类型注浆式榫槽接头的承载余量分析，并提出接头设计判据的划分规则。研究建议将接头承载特征曲线中的第2个拐点作为接头结构工作弯矩设计校核的限值。从接缝变形量、接头转动量和抗弯刚度等方面论证该设计判据拐点的合理性。在此基础上，建立加力棒在受拉侧双榫接头的承载判据包络图，并对实际应用中同种类型接头进行有限元数值模拟和现场测试结果的校核。数值计算与现场测试结果均表明所研究的接头具有较大的安全储备。

The working state of the grouted mortise-tenon joints with significant bearing capacity is a crucial component in the design of dry-connection prefabricated station structures. The authors analyze the bearing capacity margin of various grouted mortise-tenon joints and propose a classification rule for the joint design criteria based on the results of the 1∶1 prototype loading test on various joints along the primary stress directions. It is suggested that the second inflection point in the joint bearing characteristic curve should be used as the limit value for the design verification of the working bending moment of the joint structure. Subsequently, the rationality of such a design criterion inflection point is validated in terms of joint deformation, joint rotation, and bending stiffness. On this basis, an envelope diagram of the bearing capacity criterion for double-tenon joints with the pretensioned steel bars on the tension side is established. The finite element numerical simulations and field test results of the same joints in practical applications are verified. The numerical calculation and the field test results indicate that the studied joints exhibit a large safety margin.