Q235B钢螺栓球柱节点的受拉承载力

Uniaxial Tension Bearing Capacity of Q235B Steel Bolted Ball-Cylinder Joint

摘要:

基于3个单向受拉螺栓球柱节点的试验，采用ABAQUS软件建立单向受拉螺栓球柱节点的数值模型，并将数值分析结果与试验结果进行对比，验证了数值模型的有效性。随后建立了87个数值模型对螺栓球柱节点的单向受拉承载力影响参数进行了分析，定义了节点单向受拉极限承载力的取值准则。数值计算结果表明，圆柱筒径越小、壁厚越厚、筒壁高度越高，节点的单向受拉承载力越高；增大螺栓间距和尺寸对节点的刚度和强度有一定提高；增设加劲肋可提高螺栓球柱节点的刚度和承载力；当螺栓拧入深度不足时，节点易发生螺栓拔出破坏，实际工程中建议螺栓拧入弧形端板的深度大于螺栓直径。基于理论分析，拟合得到了螺栓球柱节点单向受拉承载力的实用计算式。拟合算式计算结果与有限元分析结果及试验结果的相对误差均在10%以内。

Abstract:

Based on the uniaxial tension experiments on 3 bolted ball-cylinder (BBC) joints, the finite element (FE) models of the tension specimens were established by using ABAQUS and were proved by comparing with experimental results. Then 87 FE models were established to analyze the influence parameters of the uniaxial tension bearing capacity of the joint. Meanwhile, the ultimate bearing capacity of the joint under uniaxial tension was defined. The FE results indicate that with the drop of the diameter of the cylinder and the length of the chord member, and the increase of the thickness of the cylinder wall, the height of the cylinder, the spacing and the size of the bolts, the bearing capacity of the joint increases. The joints with rib stiffeners produce a better stiffness and bearing capacity than ordinary ones. The insufficiency of the screw-in length of high strength bolts will cause the evulsion of bolts. Therefore, it is suggested that the screw-in length of bolts should be larger than the bolt diameter. Based on theoretical analysis, practical calculation formulae for the bearing capacity of BBC joints under uniaxial tension were proposed. The relative errors between the fitting formulae calculations and the numerical and experimental results are less than 10%.