为了研究盾构隧道混凝土管片中轴力对接头极限弯矩的影响，将螺栓连接的混凝土管片接头简化成梁模型，建立混凝土管片接头极限承载力的计算模型。基于弯矩作用下管片接头截面平面变形假定，推导管片接头截面力平衡和弯矩平衡表达式，建立受拉区螺栓应力与受压区高度和混凝土极限应变之间的关系。以北京地铁隧道和上海地铁隧道管片为例，分析轴力对混凝土管片接头极限承载力的影响，并研究管片接头的破坏方式。研究表明，地铁隧道管片接头的极限承载力随着轴力的增加而增加，将解析模型计算结果与有限元模型结果进行对比，验证了所提出计算模型的准确性。

In order to study the influence of axial force of concrete segment of shield tunnel on ultimate bending moment of segment joint, the concrete segment joint strengthened by straight bolts is simplified as a beam model; and then the computing model for ultimate flexural capacity of reinforced concrete segment is proposed. The equations for force equilibrium and moment equilibrium of segment joint crosssection are derived; and the relationship between bolt stress in tensile zone and ultimate strain of concrete and that between height of compression zone and the ultimate strain of concrete are established based on assumption of plane deformation of segment crossssection under the action of bending moment. In case studies, the influence of axial force of concrete segment on ultimate bearing capacity of concrete segment and the broken modes of segment joints are studied. The study results show that the ultimate bearing capacity of segment joint increases with axial force of segment increases. The feasibility of the proposed computing model is verified by comparison between the study results and finite element simulation results.