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中文摘要：
针对钢弹簧浮置板轨道参数变化对其动力特性的影响，选取道床板长度、道床板厚度、弹簧刚度、支承间距、扣件刚度5个参数及其不同水平值，进行正交试验，并建立相应的三维有限元模型。采用模态分析方法对钢弹簧浮置板轨道进行动力特性研究，获得了轨道的固有频率和振型，分析其传导比特性。分析结果表明：影响钢弹簧浮置板轨道低阶固有频率的主要参数是支承间距、道床板厚度和弹簧刚度，而影响高阶固有频率的主要参数是道床板长度；尤论参数如何改变，钢弹簧浮置板轨道主要以道床板的振动为主；传导比最大峰值出现在基频附近，且随着道床板长度的增加而增大。
英文摘要：
The parameter variations of the steel spring floating slab track （SSFST） have the influence on its dynamic characteristics. Five parameters including the length and the thickness of the roadbed slab, the stiffness of the steel springs, the bearing spacing and the stiffness of the fasteners as well as different level values for each of the parameters were chosen to carry out the orthogonal test, and then three-dimensional finite element models for SSFST were constructed. The dynamic characteristics of SSFST were studied by modal analysis method. The eigenfrequencies and vibration mode shapes of SSFST were obtained. Furthermore, the transmission ratios for SSFST were analyzed. Analysis results show that the spacing and stiffness of the steel springs and the thickness of the slab mainly play the dominant role in lower eigenfre- quencies of SSFST. However, the main influencing parameter is the length of the slab in higher eigenfrequencies. The vibration of the slab dominates in all mode shapes of SSFST, whatever the parameters are. The maximum peak value of the transmission ratio appears at the basic frequency and increases with the length of the slab.
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Solution of Moving-load Induced Soil Vibrations Based on the Betti-Rayleigh Dynamic Reciprocal Theor
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