【摘要】 以兰新线强风地区某段接触网为研究对象,根据接触网的结构特点,利用通用有限元分析软件ANSYS建立单个锚段的支持结构与线耦合的有限元模型。采用Davenport功率谱模拟了适用于接触网结构特点的风速时程,应用非线性有限元法获得接触网在不同平均风速下脉动风荷载作用的风振响应时程;根据特征响应点的风振响应时程,运用Budiansky-Roth准则和动态增量法分析比较接触网结构特性对接触网动力稳定性的影响。分析结果表明:由于兰新线百里风区的最大风速达到了74m.s-1,因此选用跨距小于50m、承力索张力大于15kN的接触网结构较为适宜;通过适当增加承力索张力、减小接触网跨距和降低接触导线高度等措施可有效改善接触网结构的抗风稳定性,而增加吊线数对提高接触网动力稳定性的效果较小。更多还原

【Abstract】 A certain segment of the catenary of Lanzhou-Xinjiang Railway in strong wind area was taken as the research object. According to the structural characteristics of the catenary systems,a finite element model of the single segment catenary was built up by the finite element program ANSYS,which consisted of the hanging structure and the support structure. A multivariable simulation model of stochastic wind field based on the spectral representation method was proposed,which adopted the DAVENPORT power spectral density unchanging along the height. The response of catenary to vibration caused by varying intensity wind was attained by non-linear finite element method. The dynamic stability and the effect of the structure characteristics on the dynamic stability were researched by combining two kinds of methods:Budiansky-Roth criteria and incremental dynamic analysis. The results show that it is more appropriate to adopt the catenary whose span is less than 50 m,and whose messenger wire tension is greater than 15 kN,because the maximum wind speed of Hundred-Mile Wind Area reaches 74 m·s-1 in Lanzhou-Xinjiang Railway. The dynamic stability of the catenary systems subjected to the dynamic wind load can be improved in evidence by increasing the tension of the messenger wire,decreasing the span of the catenary and reducing the height of the contact wire,while increasing the number of the suspension wire improves less the dynamic stability of the catenary systems.更多还原