不锈钢螺栓连接节点抗剪性能试验

Experimental Research on Bearing Performance of Stainless Steel Bolted Joints

目的研究端距、边距及板厚等因素对不锈钢螺栓连接节点抗剪承载力的影响,为后续提出不锈钢螺栓连接承载力设计方法提供试验依据.方法设计10个不锈钢螺栓盖板连接节点试件进行拉伸试验,考虑端距、边距、螺栓中距和板厚等参数,通过粘贴的应变片数值变化快慢及总应变大小来判断螺栓连接节点的破坏模式.结果在其他因素不变情况下,端距小于2 d时易发生冲切破坏,边距小于1.5 d时易发生净截面破坏,螺栓中距小于3 d时两螺栓之间板件易发生冲切破坏或承压破坏;且当板厚小于4 mm时,盖板平面外易发生翘曲.结论满足螺栓中距应不小于3 d、端距不小于2 d和边距不小于1.5 d的构造才是经济安全的;建议板厚大于4 mm为厚板,小于4 mm为薄板,薄板易发生翘曲,且端距越大越容易发生;当发生翘曲时,翘曲部位受力由受压变为受拉,会导致连接节点承压强度发生折减.

This paper studies the influence of the end distance, edge distance and the thickness of the plate on the shear bearing capacity of the stainless steel bolt joint, which provides the experi- mental basis for the design method of the bearing capacity of the stainless steel bolt connection. U- sing ten stainless steel bolt cover joints tensile test specimens, considering end distance, edge distance, bolt spacing and thickness of the plate, the strain gauge pasted numerical change rate and the total strain size to determine the failure modes of bolted joints. In other factors unchanged, end distance less than 2d prone to punching failure, edge distance less than 1.5d prefer to net section margins damage, the bolt distance less than two 3d between the bolt plate make for punching failure or bearing failure;and when the plate thickness is less than 4 mm, the flat plane are ape to curling. The bolt distance should not be less than 3d and not less than 2d from the end distance and edge distance not less than 1.5d is economic security;and the plate thickness is greater than 4 mm thick, less than 4 mm when the sheet, for heavy plate, curling is difficult to occur, and prone to curling of thin plate, and the bigger end distance prone to curling;when curling happened, parts of the force by compression to tension ,resulting in pressure and strength reduction.