冷弯厚壁型钢螺栓连接抗剪性能试验

通过30个厚度为10 mm的冷弯厚壁型钢螺栓连接件的静力拉伸试验,考察不同边距、端距下试件的破坏模式、抗剪承载力及相关规范的适用性,并基于试验结果对规程建议公式进行修正.研究结果表明：在考察的边距、端距范围内,试件出现净截面、剪出、剪出与孔壁承压混合三种破坏模式;当试件发生剪出和剪出与孔壁承压混合破坏时,剪切破坏面上存在裂缝;试件达到极限承载力之前,出现在螺栓孔前的裂缝会减小钢板的受剪面积,导致试件抗剪承载力的计算结果高于实测结果;基于实际受剪面修正的剪出破坏承载力计算公式概念清晰,计算精度高;修正后美国规范AISC 360-16的计算结果与试验结果吻合最好,未修正的美国规范ANSI/AISC 360-16次之,而欧洲规范EN 1993-1-8的计算结果偏保守,中国规范GB 50018-2002的计算结果过于保守.

Experiment on Shear Behavior of Bolted Connection of Cold-Formed Thick-Walled Steel

Through the static tensile experiment of 30 specimens of cold-formed thick-walled steel with 10mm thickness, the failure mode, shear bearing capacity and the applicability of relevant specifications of specimens with different edge distance and end distance are investigated. Based on the experimental results, the recommended formula of the specification is modified. The results show that, in the experimental range of edge distance and end distance, there are three failure modes of the specimen: net section failure, shear out failure, and shear out-bearing mixed failure. When the sheared out and shear out-bearing mixed failures occur, there are cracks on the shear failure surface. Before the specimen reaches the ultimate bearing capacity, the cracks appearing in front of the bolt hole reduce the shear area of the steel plate, resulting in greater calculation result of the shear bearing capacity of the specimen than the measured result. The calculation formula of shear failure bearing capacity based on the correction of actual shear surface has clear concept and high calculation accuracy. The best agreement with the experimental results is the calculation results of the revised American code ANSI/AISC 360-16, the second is the unmodified American code ANSI/AISC 360-16, the calculation results of European code EN 1993-1-8 are conservative, and the calculation results of Chinese code GB 50018-2002 are too conservative.