螺纹锚固单边螺栓端板连接节点弯剪作用性能研究

Behavior of Thread-Fixed One-Side Bolted Connection under Bending Moment and Shear Force

现有研究中针对螺纹锚固单边螺栓连接节点的加载工况较为简单,一般为纯弯、纯拉或者纯剪。实际结构节点的抗弯和抗剪承载力之间存在明显相互作用关系,因此需要对节点在弯矩、剪力共同作用下的受力性能与计算方法进行研究。通过试验研究了弯矩和剪力共同作用对于螺纹锚固单边螺栓端板连接节点受力性能的影响,并将单边螺栓连接节点与带螺母高强螺栓连接节点的受力性能进行了对比。借助经过验证的有限元模型补充分析了不同弯矩与剪力大小组合下节点的受力性能,总结出剪力对节点抗弯承载力的影响规律,并得到了节点弯矩-剪力相关承载力。结果表明,剪力造成的钢管螺栓孔变形会进一步削弱螺纹锚固状态,进而降低节点抗拉强度;相较于拉力,剪力对于螺纹锚固单边螺栓连接节点承载力的影响更大。

The existing researches on thread-fixed one-side bolted connections are simple, generally pure bending, pure tension, and pure shear. There is an obvious relationship between the bending and shear bearing capacity of the practical structural connections, so it is necessary to study the structural performance and calculation method of the connections under the combination of bending and shear. This paper conducted experimental research on the influence of bending moment and shear force on the mechanical performance of the thread-fixed one-side bolts bolted joints and traditional nut-fixed double-sides bolted connections for comparison. Parametric analysis of thread-fixed one-side bolts bolted joints under bending moment and shear force was carried out utilizing finite element model verified by the test results. The influence of shear force against bending performance was discussed, meanwhile, the interactive relationship between bending and shear capacity was drawn. The results show that the deformation of the screwed bolt hole caused by shear force will further weaken the anchor effect of the threads, and then reduce the tensile strength of the connection.Therefore, the shear force has a greater influence on the connection bearing capacity than the tensile force.