桥梁和轨道的联结采用非线性梁单元模拟，其材料弹性模量和屈服应力通过轨道纵向位移阻力与梁轨相对位移关系的双折线化确定；

The coupling between bridge and track adopts by beam unit, modulus of electricity of and yielding stress according to the broken line of the non-liner rail longitudinal resistance of displacement.

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由于多方面的原因，如：非线性因素、材料的不均匀性、阻尼机理的复杂性，再加上联结刚度难以确定等等，使得有限元计算的准确性受到限制。

Because various reason such as: Nonlinear, asymmetry of material, complexity of damping mechanism, and be hard to make certain of coupling, making a accurate calculating is subjected to restrictive.

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引入了位移联结、速度联结和加速度联结，从而使联结理论适用于非线性机械系统的动力学建模。

The displacement connection, the velocity connection and the acceleration connection are introduced to expand the theory of connection (TC) into dynamics modeling of nonlinear mechanical systems.

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