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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。
In view of the importance of the failure mode of PBL shear connectors, the failure modes of connectors are classified and summarized based on the existing test results. Through the analysis of the test results of the typical specimens under different failure modes, the failure modes of concrete mortars are pointed out Insufficient. Through three groups of nine specimens of the destruction test of concrete mortar damage morphology was studied and based on the test results illustrate the concrete mortar different failure causes. The results show that the load-bearing capacity of the connector under the shear failure of the concrete tenons is the highest and the stiffness is the slowest one. The compression failure of concrete is caused by the lack of lateral restraint perpendicular to the steel plate. Damage is caused by the steel plate thickness is too thin to make the hole in the concrete quality can not be caused; In order to ensure the ultimate bearing state of the concrete tenon shear failure, PBL shear connector must have strong vertical direction perpendicular to the steel plate horizontal constraint and sufficient Thick perforated steel.