薄钢板机械咬合螺栓抗剪连接试验与计算方法

Experiment and Calculation Method of Occlusive Bolt Connections in Shear Between Thin Steel Sheets

为探究薄钢板机械咬合螺栓抗剪连接的受力性能,设计了12个具有不同垫圈形状和预拉力的机械咬合螺栓连接试件和普通螺栓连接试件,并开展了受剪破坏试验。试验结果表明机械咬合螺栓连接试件的薄钢板在咬合部位发生受拉破坏,而普通螺栓连接试件的薄钢板出现孔壁承压破坏,且机械咬合螺栓连接的受剪承载力显著高于普通螺栓连接的受剪承载力。分别建立了机械咬合螺栓连接和普通螺栓连接的精细有限元模型,根据受剪试验结果验证了模型的准确性,进一步探究了垫圈直径、螺栓直径、钢板厚度和咬合深度对机械咬合螺栓连接受剪承载力的影响规律。最后开展了机械咬合螺栓连接的受剪承载机理分析,提出了能够准确预测其受剪承载力的计算公式。

In order to explore the occlusive bolt connections in shear between thin steel sheets,a total of 12 occlusive bolt connection specimens and ordinary bolted connection specimens with different washer shapes and pretension forces were designed,and shear tests on the specimens were carried out until failure.The experimental results show that the thin steel sheets of the occlusive bolt connections displayed tension failure adjacent to the occlusive location,while the thin steel sheets of the ordinary bolted connections exhibited bearing failure close to the bolt hole.It was evident that the shear capacities of the occlusive bolt connections were significantly higher than those of the ordinary bolted connections.Finite element models of both occlusive and ordinary bolted connections were developed,and the accuracy of these models was validated against the obtained shear test results.The influences of the washer diameter,the bolt diameter,the sheet thickness and the occlusive depth on the shear capacity of the occlusive bolt connections were further examined.Finally,the shear mechanism of the occlusive bolt connections was studied,and a calculation formula with accurate predictions of shear capacity was proposed.