The behavior of the track structure as a beam (the rail), supported by a continuous elastic foundation (representative of the ties, ballast, and subgrade), is well known and understood. It has been the subject of numerous studies and analysis models. This Beam On Elastic Foundation (BOEF) support model indicates that the wheel load, applied to the track by each passing train wheel, is distributed, by the rail, over a number of crossties. The exact distribution of load varies as a function of the foundation stiffness, as defined by the track modulus, k, the rail size, and the tie spacing. This distribution is illustrated in Figure 1 for a single wheel which applies a dynamic load P to the top of the rail head for a good, well supported, wood-tie track with a track modulus of 4,000 lb/in/in. As can be seen in this figure, 93% of the load is carried by the five ties directly under the wheel in this track configuration.
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机译：轨道结构作为光束（轨道）的行为由连续弹性地基（代表线圈，镇流器和路基）支撑的梁（轨道）是众所周知的和理解的。 它一直是众多研究和分析模型的主题。 弹性基础（BoEF）支撑模型上的该光束表明，每个通过火车轮施加到轨道的车轮载荷，由轨道分布在许多圆圈上。 负载的精确分布随着基础刚度的函数而变化，如轨道模量，k，导轨尺寸和系数间距所限定。 该分布在图1中示出了一个轮子，用于将动态负载P施加到轨道顶部，以获得良好的，良好的支撑的木连杆，其轨道模量为4,000磅/ in / In。 如在该图中可以看出，在该轨道配置中，93％的负载由直接在车轮下方的五个线圈承载。
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