多层半平行钢丝索静力拉伸模型及参数分析  

Static Model and Parameter Analysis of Multilayered Semi-Parallel Wire Cable Under Tensile Load

作　　者：彭崇梅[1] 张启伟[1] 李元兵[1] 

机构地区：[1]同济大学桥梁工程系,上海200092

出　　处：《华南理工大学学报（自然科学版）》2013年第8期115-119,126,共6页Journal of South China University of Technology(Natural Science Edition)

基　　金：国家自然科学基金资助项目(50978199);土木工程防灾国家重点实验室自主研究课题(SLDRCE09-B-16)

摘　　要：半平行钢丝索由于其钢丝的螺旋外形和本身构造的特殊性,难以直接应用基于平行钢丝假定的并联模型或钢绞线模型进行力学分析.文中基于Love曲杆理论,考虑钢丝弯矩、扭矩和泊松效应的影响,推导了静力拉伸荷载作用下的多层半平行钢丝索的非线性方程;重点讨论了螺旋角对半平行钢丝索轴力、轴向刚度和钢丝层间拉力分布等的影响.数值计算表明:随着螺旋角的增大,轴力、轴向刚度随之增大,而扭矩则先增大后减小,钢丝层间拉力分布逐渐趋于均匀.It is difficult to employ the parallel model or the steel strand model based on the assumption of parallel wire to analyze the mechanical properties of the semi-parallel cable due to its helical characteristics and special structure.In this paper,a nonlinear equation of multilayered semi-parallel cable under the static tensile load is derived based on the theory of Love＇s curved bar and by considering the effects of the bending moment,the torque and the Poisson effect.Moreover,the effects of the helical angle on the axial force,the torsion,the axial stiffness and the distribution of the tensions between wire layers are discussed in detail.Numerical results show that,with the increase of the helical angle,both the axial force and the axial stiffness increase,the torque first increases and then decreases,and the distribution of the tensions between wire layers tends to be uniform.

关 键 词：半平行钢丝索 螺旋角 轴向刚度 静力特性 

分 类 号：U443.38[建筑科学—桥梁与隧道工程]