As the width of segments increases, segmental joints containing three oblique bolts are increasingly used while their flexural behavior is still not clear. Therefore, this paper presents a comprehensive investigation on the flexural behavior of such joints; and the effects of bolt arrangement are also highlighted. A series of full-scale experiments and numerical simulations are first performed to reveal the typical flexural behavior and failure characteristics of the joint with one single oblique bolt. Then, the verified numerical model is extended to investigate the influence of different oblique bolt arrangements (i.e. number and direction) on the joint flexural behavior under different axial forces. Five bearing stages can be identified during the whole loading process of joints, and they are separated by the bolts tension, concrete severe damage, contact of the segment top, and joint failure. Under small axial force, the joint failure under the positive moment is dominated by the tensile damage of concrete around bolt holes; while the compressive damage of concrete at the same position controls the joint failure under the negative moment. The concrete damage area changes to the compression zone as the axial force increases. The oblique bolt arrangement has little effect on the identification of five-stage bearing process of such segmental joints, but increasing the number of bolts can improve the flexural stiffness and ultimate bearing capacity of joints. Moreover, the joint containing three cross oblique bolts has a stronger flexural capacity than that containing three parallel bolts under small axial forces, which is because the change of the bolt direction avoids the connection of tensile damage zones around the bolt holes. However, these effects of bolt arrangement fade away as the axial force increases.

随着节段宽度的增加，越来越多地使用包含三个斜螺栓的节段接头，但其弯曲行为仍不清楚。因此，本文对此类接头的弯曲行为进行了全面研究；螺栓布置的影响也很突出。首先进行了一系列全尺寸实验和数值模拟，以揭示单斜螺栓连接的典型弯曲行为和失效特征。然后，扩展经过验证的数值模型以研究不同的倾斜螺栓布置（即数量和方向）对不同轴向力下的接头弯曲行为的影响。节点在整个受力过程中可识别出五个受力阶段，它们由螺栓拉力分开，混凝土严重损坏，管段顶部接触，接头失效。小轴力下，正力矩下的节点破坏以螺栓孔周围混凝土的拉伸破坏为主；而同一位置的混凝土受压破坏控制着负弯矩下的节点破坏。随着轴力的增大，混凝土破坏区转变为受压区。螺栓倾斜布置对此类节段节点五级受力过程的识别影响不大，但增加螺栓数量可以提高节点的抗弯刚度和极限承载力。此外，在较小的轴向力下，包含三个交叉斜螺栓的接头比包含三个平行螺栓的接头具有更强的抗弯能力，这是因为螺栓方向的改变避免了螺栓孔周围拉伸破坏区的连接。然而，随着轴向力的增加，螺栓布置的这些影响逐渐消失。