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接触网体系兼有高柔性、大跨度等特点,具有非常强的几何非线形,对风荷载非常敏感。强风地区因风载所致的损坏是接触网体系经常发生的破坏形式之一。以新疆强风地区某段接触网为研究对象,针对接触网的结构特点,利用通用软件Ansys建立了单个锚段的支撑结构与线耦合的有限元模型,并采用Davenport功率谱模拟了针对接触网结构特点的风速时程,采用非线形有限元法,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,并与利用传统的风荷载计算方法(静态方法)的风振响应进行了比较分析。结果表明:脉动风对接触网的风振响应影响很大,采用传统计算方法(静态方法)计算结果偏于不安全,在设计时应考虑脉动风的影响,采用动态计算方法。
Catenary system combines high flexibility, large span and other characteristics, has a very strong geometric nonlinear, very sensitive to wind loads. Damage due to wind loads in strong winds is one of the forms of destruction that often occurs in catenary systems. Taking a catenary in a strong wind area of Xinjiang as the research object, according to the structural characteristics of the catenary, the finite element model of the supporting structure and the line coupling of a single anchorage segment was established by using the general software Ansys. The Davenport power spectrum was used to simulate the catenary structure Characteristics of the wind time history, using nonlinear finite element method to obtain the catenary fluctuating wind load at different mean wind speeds of the wind-induced response time, and with the traditional wind load calculation method (static method) wind-induced vibration response A comparative analysis. The results show that the fluctuating wind has a great influence on the wind-induced vibration response of the catenary. The calculation results of the traditional method (static method) are unsafe. The influence of the fluctuating wind should be considered in the design, and the dynamic calculation method is adopted.