The damage evolution of segmental joints under compression–bending loads is critical in the structural design and strengthening of segmental structures. In this study, a loading device that can maintain the pure bending state of the joint is designed based on the deficiency of existing test methods in boundary conditions. Failure tests under positive and negative bending are performed to investigate the damage of segmental joints under high axial pressure, and the acoustic emission (AE) devices are adopted to measure the joint damage quantitatively. Based on the test results, the main conclusions are as follows: The damage process of the joint is divided into three stages, and the occurrence of clear peaks in the AE count signifies that the joints reached failure state; The development of joint damage location can be divided into the damage location increasing stage and the damage degree deepening stage; The damage of segmental joints under high axial pressure is mainly distributed around the core-pressure zone of the joint, this area is prone to cracking and crushing, and the joints are weaker under negative bending, and damage is more severe; Joint damage along the direction vertical to the joint surface ranges between ±0.855h (positive bending, where h is the height of joint) and ±0.584h (negative bending), moreover, the damage range along the joint surface is approximately 0.2h–0.7h from the compression zone, furthermore, the damage distribution along the segment width is concentrated at the bolt, and the damage range is approximately 0.4b (where b is the averaged segment width of each bolt).

压缩弯曲载荷下管片节点的损伤演变对于管片结构的结构设计和加固至关重要。本研究针对现有边界条件测试方法的不足，设计了一种能够保持接头纯弯曲​​状态的加载装置。进行正负弯曲破坏试验，研究高轴向压力下节段接头的损伤情况，并采用声发射（AE）装置对接头损伤进行定量测量。根据试验结果，主要结论如下： 接头的损伤过程分为三个阶段，AE计数中出现明显的峰值表示接头达到失效状态；关节损伤部位的发展可分为损伤部位增加阶段和损伤程度加深阶段；高轴压下节段接头的损伤主要分布在接头的心压区周围，该区域容易发生开裂和压溃，在负弯作用下接头较弱，损伤较严重；沿垂直于关节面方向的关节损伤范围在±0.855之间h（正弯曲，其中h为接头高度）和±0.584 h（负弯曲），此外，沿接头表面的损伤范围约为距压缩区0.2 h –0.7 h，此外，沿关节面的损伤分布段宽集中在螺栓处，损坏范围约为 0.4 b（其中b是每个螺栓的平均段宽）。