摘   要：设计了2个带配筋键槽的预应力-环氧树脂接缝试件M1、M2和1个平接缝预应力-环氧树脂接缝试件，对其进行了静力加载试验，研究了试件的破坏形态、承载力、接缝滑移、钢筋应变等参数的变化规律，并基于莫尔-库仑摩擦破坏准则建立了带配筋键槽预应力-环氧树脂接缝试件的受剪承载力计算公式，分析了该计算公式的可靠指标。结果表明：接缝处的环氧树脂黏结性能良好，胶层与混凝土未脱开；带配筋键槽预应力-环氧树脂接缝试件均出现了从近加载端键齿根部延伸至中部键齿根部的斜裂缝，试件最终因斜裂缝贯通而发生直剪破坏；采用平接缝的预应力-环氧树脂接缝试件由于未配置U形钢筋，未发生接缝破坏，而是接缝下部构件发生了剪切破坏，承载力偏低；增加接缝预压应力可提高试件的开裂荷载和峰值荷载，并可有效减小接缝的张开宽度；峰值荷载时，试件M1、M2的预应力增量分别为1 293 MPa、579 MPa；建立的带配筋键槽预应力-环氧树脂接缝的受剪承载力计算公式的精度较好，可靠指标为4.2。

Abstract: Two prestressed epoxy resin joint specimens M1 and M2 with reinforcement and shear keyway, as well as one prestressed epoxy resin joint specimen with flat joint, were designed and subjected to static loading tests. The variation laws of parameters such as failure mode, bearing capacity, joint slip, and steel strain of the specimens were studied. Based on the Mohr-Coulomb friction failure criterion, a shear bearing capacity calculation formula for prestressed epoxy resin joint specimens with reinforcement and shear keyway was established, and the reliability index of the calculation formula was analyzed. The results indicate that the bonding performance of the epoxy resin in the joints is good, with no detachment of the adhesive layer from the concrete. The prestressed epoxy resin joint specimens with reinforcement and shear keyway exhibit diagonal cracks extending from the root of the key tooth near the loading end to the root of the middle key tooth, ultimately leading to direct shear failure due to the penetration of these cracks. The prestressed epoxy resin joint specimen with flat joint, which does not have U-shaped steels, does not suffer joint failure, but exhibits shear failure in the component below the joint, resulting in a lower bearing capacity. Increasing the prestress in the joint improves the cracking load and peak load of the specimens, and effectively reduces the opening width of the joint. When the peak load is reached, the prestress increments of specimens M1 and M2 are 1 293 MPa and 579 MPa, respectively. The established formula for calculating the shear bearing capacity of prestressed epoxy resin joint with reinforcement and shear keyway has good accuracy, and its reliability index is 4.2.