In strong wind area, wind vibration on key railway catenary components may lead to safety hidden danger like fatigue failures. In this work, a load identification approach was proposed by decoupling the wind-induced suspension attitude to acquire the hard-to-get environmental wind load and evaluate the catenary fatigue damage on railway catenary. In theoretical modeling, mechanical relation between wind load and registration displacement is formulated in pure lateral and vertical loading by finite element analysis. Wind load is identified via suspension attitude decoupling into displacement under individual load. Nodal forces, as the external load acting on catenary connections between supporting beams, are further correlated with the identified wind load to calculate the structural stress of catenary components. In experiment, visual detection is used to measure the wind-induced attitude of catenary suspension in wind area, where maximum wind speed climbs up to 41 m/s. Experimental results are transferred into wind loads and nodal forces using the proposed model. Stress spectra and fatigue damage evaluation of connection components are carried out adopting the rain-flow counting method and damage accumulation rule. Research outcome certifies that the proposed methodology provides an effective means to evaluate the fatigue behavior of railway catenary in wind area.

中文翻译：

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铁路接触网风致姿态解耦的载荷识别与疲劳评估

在强风地区，铁路接触网关键部件风振可能导致疲劳失效等安全隐患。在这项工作中，提出了一种载荷识别方法，通过解耦风致悬挂姿态来获取难以获得的环境风载荷并评估铁路接触网的接触网疲劳损伤。在理论建模中，风荷载与配准位移之间的力学关系是通过有限元分析在纯横向和垂直荷载下建立的。风荷载通过悬架姿态解耦到单个荷载下的位移来识别。节点力，作为作用在支撑梁之间的悬链线连接上的外部载荷，进一步与识别的风荷载相关联，以计算悬链线组件的结构应力。在实验中，视觉检测用于测量风区悬链线悬挂的风致姿态，最大风速可达41 m/s。使用所提出的模型将实验结果转换为风荷载和节点力。采用雨流计数法和损伤累积规律对连接构件进行应力谱和疲劳损伤评估。研究结果证明，所提出的方法为评估风区铁路接触网疲劳行为提供了一种有效手段。采用雨流计数法和损伤累积规律对连接构件进行应力谱和疲劳损伤评估。研究结果证明，所提出的方法为评估风区铁路接触网疲劳行为提供了一种有效手段。采用雨流计数法和损伤累积规律对连接构件进行应力谱和疲劳损伤评估。研究结果证明，所提出的方法为评估风区铁路接触网疲劳行为提供了一种有效手段。