输电铁塔螺栓节点连接滑移特性及模型参数研究

发布时间：2018-08-19 08:47

【摘要】：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%。
[Abstract]:The tensile tests of 21 groups of bolted connection specimens of transmission tower were completed. The finite element simulation analysis of typical specimens was carried out by using ABAQUS software. The effects of initial clearance, bolt torque, roughness of contact surface, diameter of bolt hole and strength of connecting rod on load-deformation curve of bolted joint were studied. The load-deformation test curves of 1,2 and 3 bolts at fixed ends are fitted nonlinearly with the improved piecewise polynomial model and the fitting parameters of the two models are determined. The feasibility of applying the two models to the structural analysis of transmission towers is analyzed. The exponential model with clear physical meaning and wider application range is recommended. For the maximum clearance, ideal clearance and minimum clearance, the load-deformation curve obtained by exponential model is in good agreement with the test curve, which can accurately describe the slip process of bolt connection; the error between the fitting curve and the test curve under the minimum clearance condition is relatively large in the linear increase section, and the maximum relative difference is about 10%~10%. 20%.
【作者单位】：中国电力科学研究院;
【基金】：国家自然科学基金项目(51408568)
【分类号】：TU391

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