基于七丝钢绞线拉索精细化有限元模型的抗弯刚度研究  

Study on Flexural Stiffness Based on Fine Finite Element Model of Cable of Seven-wire Steel Strand

作　　者：刘斐 罗永发 谭冬梅[1] 甘沁霖 LIU Fei;LUO Yong-fa;TAN Dong-mei;GAN Qin-lin(Hubei Key Lab of Roadway Bridge&Structure Engineering,Wuhan University o£Technology,Wuhan 430070,China;CCCC Fourth Highway Engineering Co Ltd,Beijing 100022,China)

机构地区：[1]武汉理工大学道路桥梁与结构工程湖北省重点实验室,武汉430070 [2]中交第四公路工程局有限公司,北京100022

出　　处：《武汉理工大学学报》2021年第1期53-60,共8页Journal of Wuhan University of Technology

基　　金：国家自然科学基金(51408452);湖北省重点实验室开放基金(DQJJ201906)。

摘　　要：以半平行钢绞线斜拉索为研究对象,使用有限元软件ANSYS进行参数化建模,将几何模型导入到ANSYS WORKBENCH进行接触设置、网格划分。再对钢绞线拉索施加轴向以及弯曲荷载,考虑材料的弹塑性以及钢丝间的摩擦接触,分析钢绞线拉索在加载过程中的弯曲刚度和滑移变化以及接触区域的应力变化。最后考虑摩擦系数、温度荷载和轴向荷载及HDPE护套对弯曲刚度和接触特性的影响,并分析滑移和弯曲刚度的关系。结果表明:随着摩擦系数的增加,钢丝间滑移距离减小,抗弯刚度显著提高;拉索的抗弯刚度随温度荷载增加而减少,轴向拉力对钢绞线拉索的抗弯刚度有显著提高;轴力与抗弯刚度呈正相关关系;HDPE护套对拉索的抗弯刚度影响很小,不能给钢绞线有力的握裹作用;滑移距离最大值与抗弯刚度除荷载施加初始阶段外呈反函数关系。The semi-parallel strand stay cable was taken as the object of study.ANSYS,the large-scale finite element software,is used for parametric modeling,and the geometric model is imported into ANSYS Workbench for contact setting and mesh generation,then the axial and bending loads are applied to the steel strand cables,the elastic-plastic properties of the materials and the friction contact between the wires muse be considered.The change of bending stiffness and the stress development of contact area will be analyzed.The influence of different factors such as friction coefficient,temperature load,axial load,HDPE sheath on bending stiffness and contact characteristics will be considered in order to discuss the relationship between slip and bending stiffness.According to the research:The slip distance between the steel wires decreases with the increase of its friction coefficient,and its bending stiffness improves significantly;The bending stiffness of the cable decreases with the increase of temperature load,and it improves significantly because of the axial tension;There is a positive correlation between axial force and bending stiffness;HDPE sheath has little effect on the bending stiffness of cables,it can’t give a strong grip to the strand;There is an inverse function relation between the maximum slip distance and flexural stiffness except the initial stage of load application.

关 键 词：抗弯刚度 钢绞线 梁单元 参数化建模 

分 类 号：U441[建筑科学—桥梁与隧道工程]