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完成了21组输电铁塔螺栓连接试件的拉伸试验,采用ABAQUS软件对典型试件进行了有限元仿真分析,研究了初始间隙、螺栓扭矩、接触面粗糙程度、螺栓孔直径和连接杆件强度等参数对螺栓节点荷载-变形曲线的影响规律。分别按照指数模型和改进的分段多项式模型,对固定端螺栓数量为1、2和3的荷载-变形试验曲线进行了非线性拟合,确定了两种模型的拟合参数取值,分析了两种模型在输电铁塔结构分析中应用的可行性,推荐采用物理意义明确、适用范围更广的指数模型。对于最大间隙、理想间隙和最小间隙三种情况,指数模型得到的荷载-变形拟合曲线与试验曲线吻合较好,能够准确描述螺栓连接滑移过程;最小间隙工况的拟合曲线与试验曲线在线性增加段误差相对较大,最大相对差值范围约为10%~20%。
Tensile tests were carried out for 21 groups of tower bolts, and ABAQUS software was used to simulate the typical specimens. The effects of initial clearance, bolt torque, roughness of contact surface, bolt hole diameter and connecting rod strength Influence of Equal Parameters on Load - Deformation Curves of Bolt Joints. According to the exponential model and the improved piecewise polynomial model respectively, the load-deformation curves of 1, 2 and 3 bolts with fixed bolts were nonlinearly fitted, and the fitting parameters of the two models were determined. The feasibility of applying the two models in the structural analysis of transmission towers is recommended to adopt exponential model with definite physical meanings and broader scope of application. For the three conditions of the maximum clearance, the ideal clearance and the minimum clearance, the load-deformation fitting curve obtained by the exponential model is in good agreement with the test curve, and can accurately describe the process of the bolt connection slip. The fitting curve and the test curve of the minimum clearance condition In the linear increase segment error is relatively large, the maximum relative difference in the range of about 10% to 20%.