为研究纵向轨枕长度对梯式轨道减振性能的影响，在现有纵向轨枕长度（6.15 m）的基础上，设计了另外两种纵向轨枕长度（3.65 m和8.65 m）。通过有限元软件Ls-Dyna建立不同纵向轨枕长度的梯式轨道模型，并通过实验室测试，验证其正确性。分析结果表明：纵向轨枕长度为6.15 m的梯式轨道（1）时域内，具有最小的基底振动加速度峰值；（2）1 Hz～200 Hz频段，具有最小的基底振动加速度峰值（峰值频率为49 Hz）；（3）除1 Hz～5 Hz频段外，传递损失均大于纵向轨枕长度为3.65 m的梯式轨道传递损失。1.6 Hz～2.2 Hz频段以及7.6 Hz～200 Hz频段，传递损失大于纵向轨枕长度为8.65 m的梯式轨道传递损失。%In order to study the influence of longitudinal sleeper’s lengths on vibration damping performance of ladder tracks, three longitudinal sleepers with the lengths of 3.65 m, 8.65 m and conventional 6.15 m were designed and studied. The ladder track models with different longitudinal sleeper’s lengths were built by Ls-Dyna code. Results of simulation were compared and verified by those of lab tests. The results show that:(1) The ladder track with 6.15 m sleeper length has the minimum vibration-acceleration peak value of the foundation in time-domain;(2) it has the minimum vibration-accelera-tion peak value of the foundation in frequency spectrum ranging from 1 Hz to 200 Hz (at frequency 49 Hz);(3) it has larger value of transfer loss than the ladder track with 3.65 m sleeper length except for the frequency range from 1Hz to 5 Hz;(4) it has larger value of transfer loss than the ladder track with 8.65 m sleeper length in the frequency ranges from 1.6 Hz to 2.2 Hz and 7.6 Hz to 200 Hz respectively.
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