This paper introduces the study of the effect of axial forces on the bending stiffness of con-crete segment joints by assuming the concrete segment joints as a beam model. The study drawing on the equilibrium equation of force and the assumption of plane section involves developing the bending stiffness computational models of segment joints; discussing influences of axial forces on the bending stiffness of concrete segment joints based on a shield interval of Beijing subway;simulating the regularity of changes in the bending stiffness of concrete segment joints using Finite Element Method ( FEM); and comparing the results with those of the computational models. The investigation shows that the bending stiffness of concrete segment joints in the limit state increases with the increase of the axial force and there is a ap-proximately linear relationship between the bending stiffness is and the axial force. The agreement be-tween the calculation results derived from analytical models and ones computed by FEM verifies the accu-racy of the proposed computational model.%为了分析轴力对混凝土管片接头抗弯刚度的影响,将混凝土管片接头假设为梁模型,基于混凝土管片接头截面力平衡方程和平截面假设,提出四种混凝土管片接头在极限状态时的抗弯刚度计算模型.以北京地铁盾构区间为例,计算四种模式下混凝土管片接头的抗弯刚度.采用有限元方法模拟混凝土管片接头抗弯刚度的变化规律,并与计算模型对比.结果表明,混凝土管片接头在极限状态时的抗弯刚度随着轴力的增加而增加,且抗弯刚度与轴力近似为线性关系.解析模型计算结果与有限元模拟值基本一致,验证了文中提出的解析计算模型的准确性.
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