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为研究高强螺栓端板连接件的抗拉拔性能,试验共设计了7个外伸端板连接件试件,并对其进行静力加载试验,其中4个试件采用高强螺栓替代传统的普通螺栓连接。试验对比分析了不同方钢管壁厚、螺栓孔间距、螺栓杆径对连接件抗拉拔承载能力的影响。结果表明:改变连接件中方钢管壁厚、螺栓孔间距和螺栓杆径均可以提高端板连接件的抗拉拔承载能力,其中改变方钢管壁厚对承载力的影响最为显著。且对于5mm和8mm方钢管壁厚试件的最终破坏失效模式不同,具体表现为随着空心方钢管壁厚的逐渐增大,失效模式由钢管连接面失效转变为螺栓断裂破坏。这些研究结果为高强螺栓端板连接件的研究和应用提供了一定的理论基础。
In order to study the anti-pull performance of high-strength bolt end plate connectors, a total of seven outstretched end plate connector pieces were designed and subjected to static loading test. Among them, four test pieces adopted high-strength bolts instead of the conventional ones Bolted. The effects of different square steel pipe wall thickness, bolt hole spacing and bolt rod diameter on the anti-drawing capacity of connectors were compared and analyzed. The results show that changing the thickness of the square steel pipe, the distance between the bolt holes and the rod diameter can improve the anti-pull capacity of the end plate connectors. The influence of the square steel pipe wall thickness on the bearing capacity is the most significant. And for the 5 mm and 8 mm square steel pipe wall thickness of the final failure failure mode, specifically as the hollow side of the pipe wall thickness gradually increases, the failure mode changes from the failure of steel pipe connection failure to bolt failure. These results provide a theoretical basis for the research and application of high-strength bolt end plate connectors.