In view of the disadvantages of current subgrade models of high-speed railways, such as small size, great boundary effect and single-point sine function loading, the full-scale ballastless track-subgrade model test system was founded, which included the track-subgrade test model, dynamical subgrade response measurement system and dynamical loading system. With reference to the test model, the 3-D finite element model of track-subgrade was established. EMUs CRH3/CRH380 running at 350 km/h on Ballastless Slab Track CRTSD were taken as a case for study. On the basis of the dynamical load transferring rule of high-speed trains running on ballastless tracks, numerical simulation was made to obtain counter-force time-histories curves corresponding to fastening points where different wheel-sets of adjacent bogies of adjacent carriages passed. According to the requirements of MTS servo loading machine for sending in time-histories curves, and through fourier transform and superimposition of counter-force time-histories curves corresponding to fastening points, the loaded time-histories curve imported to the actuator was received while the actuator was connected with two pairs of fastening points.%针对目前高速铁路路基模型存在尺寸小、受边界影响大、采用单点正弦函数加载等不足,建立高速铁路无砟轨道路基实尺模型试验系统.该系统由轨道路基模型、路基动力响应测试系统以及动力加载系统组成.参照试验模型,建立三维有限元数值模型.基于高速铁路无砟轨道列车动力荷载传递特性,以列车运行速度为350 km/h的CRH3/CRH380型动车组、CRTSⅡ型无砟轨道结构为例,采用数值模拟得到相邻车厢相邻转向架不同轮对经过轨道时扣件点的反力时程曲线,结合MTS加载装置对输入时程曲线的要求,通过对扣件点的反力时程曲线进行傅里叶变换和叠加,得到模型试验中作动器连接2对扣件点时的加载输入时程曲线.
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