悬索桥索夹部位主缆钢丝之间非线性关系的分析模型

摘要

In order to simplify the strong geometrical nonlinearity and contact nonlinear relationship between the large number of steel wires in the main cable of suspension bridge,and to research the transfer rules of firmly tight forces of high strength bolts in the steel wires,using the idea of homogenization,based on the macroscopic mechanical properties of the main cable and the cable clamp fastening system,the method of combining the experiment with the finite element analysis was used. The three-dimensional anisotropic solid model of the main cable was established under the cylindrical coordinate system with lengthways,radial direction and ring direction.The three-dimensional anisotropic uniform material was proposed to represent the average characteristics of the main cable system and was tested in two experiments to get the stress-strain relationship of three-dimensional anisotropic equivalent material.The results show that the frictional force of the contact surface of main cable clamp distributes in band along the length direction of the cable clamp.The firmly tight forces of high strength bolts show layered distribution in the cross section of the main cable after transmitting through the cable clamp,and are smaller in the centre and bigger at the surface.T he comparison experiment proves that the equivalent material is suitable for the study of the main cable fastening.%为了简化悬索桥主缆数量庞大的钢丝之间强烈的几何非线性与接触非线性关系,并研究高强螺栓紧固力在钢丝之间的传递规律.借鉴均质化思路,以主缆-索夹紧固系统表现出来的宏观力学性能为基础,利用试验结合有限元分析的方式,建立主缆在柱坐标下纵向、径向和环向三向异性的有限元实体模型,采用三向异性的均质材料代替主缆系统的平均特性,并在2组试验上分别进行探索和验证,得到三向异性等效材料的应力-应变关系.结果表明:主缆索夹接触面的摩擦力沿着索夹长度方向呈条带状分布;高强螺栓的紧固力经索夹传递后,在主缆横截面内呈现层状分布,中间小,表面大;对比试验验证了在主缆紧固研究中等效材料具有通适性.