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详细论述了美国肯塔基（ＫＥＮＴＲＡＣＫ）轨道模型的分析方法．肯塔基模型将轨道结构处理成材料非线性的三维问题．利用单个荷载对有限根轨枕的响应及叠加原理，得到了多个荷载作用下轨道结构的挠度矩阵．ＫＥＮＴＲＡＣＫ程序系统采用了两个破坏准则作为设计依据：一是控制道床底部出现的最大拉应力或拉应变；二是控制道床最大永久沉降或最大竖向压应力．控制点的应力或应变值用作轨道损伤计算．据此，可估算轨道的设计寿命．
The method of analyzing KENTRACK orbit model in the United States is discussed in detail. The Kentucky model treats the orbital structure as a three-dimensional material nonlinear problem. Using the response of a single load to the finite root sleeper and the superposition principle, the deflection matrix of the track structure under multiple loads is obtained. KENTRACK program system uses two failure criteria as a design basis: one is to control the maximum tensile strain or strain at the bottom of ballast bed, and the other is to control the maximum permanent settlement or maximum vertical compressive stress in ballast bed. The stress or strain at the control point is used as the track damage calculation. From this, the design life of the track can be estimated.