中文摘要：

鉴于PBL剪力连接件破坏形态的重要性，基于现有试验结果对连接件的破坏形态进行了分类总结；通过不同破坏形态下典型试件的试验结果分析，指出了对混凝土榫破坏形态认识上的不足。通过3组9个试件的破坏试验对混凝土榫的破坏形态进行了试验研究，并根据试验结果阐明了混凝土榫不同破坏形态的成因。研究结果表明：在3种混凝土榫破坏形态中，混凝土榫剪切破坏下连接件的承载能力最高、刚度衰减速度最慢；混凝土压缩破坏是由垂直于钢板面的横向约束不足造成的，混凝土割裂破坏是由钢板厚度过薄使孔内混凝土质量无法保证造成的；为保证极限承载状态下发生混凝土榫剪切破坏，PBL剪力连接件需具备足够强的垂直于钢板面方向的横向约束及足够厚的开孔钢板。

英文摘要：

The failure modes of perfobond rib shear connectors were summarized and classified based on the existing test results in view of their importance. The test result of the typical specimens in each failure mode was analyzed, and the insufficient recognition of failure modes of concrete tenon was pointed out. Nine specimens of perfobond ribshear connectors, sorted into 3 groups, were tested in the fracture test to find out the failure modes of concrete tenon, and the reason for each failure mode of concrete tenon was explained based on the test result. The result shows that （ 1 ） the bearing capacity of the connectors in the shear failure of concrete tenon is the highest, and the decay rate of its stiffness is the slowest among the 3 kinds of failure mode of concrete tenon; （2） the compressive failure of concrete tenon was caused by the lack of transversal constraint perpendicular to the rib surface, and the cutting failure of concrete tenon was induced by the thinness of the rib which caused the poor failure of concrete tenon could be ensured thickness of the rib quality of concrete in the hole; （3） the by the enough constraint perpendicular to occurrence of the shear the rib and the adequate