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为研究地震对桥梁纵连板式无砟轨道相互作用的影响,以沪昆高铁某16~32 m简支箱梁桥-CRTSⅡ型板式无砟轨道系统为研究对象,建立充分考虑轨道结构层间非线性约束的三维动力仿真模型,探讨ElCentro波和Taft波2种常见地震激励对结构受力变形的影响,对比3种不同烈度的ElCentro波对系统动力特性的影响程度。研究结果表明:地震波的频谱特性与结构动力响应紧密联系,ElCentro波对结构纵向受力与变形影响较大;地震作用下,钢轨、桥墩和端刺承受着较大纵向力;扣件、滑动层和砂浆层各向位移均在梁缝处出现峰值,扣件和砂浆层纵向位移最大值出现在端刺附近;滑动层通过底座板滑移耗能,大幅度提高了系统的抗震性能;随着地震烈度的增加,各关键构件受力变形大幅增长。
In order to study the influence of earthquakes on the interaction of ballastless track with slab track, a 16 ~ 32 m simply supported box girder bridge-CRTSⅡ slab ballastless track system with Shanghai-Kunming high-speed railway as research object, Linear dynamic constrain model to study the influence of ElCentro wave and Taft wave on the force and deformation of the structure. The effect of ElCentro waves with different intensities on the dynamic characteristics of the system was compared. The results show that the spectral characteristics of seismic wave are closely related to the dynamic response of the structure. The ElCentro wave has a great influence on the longitudinal stress and deformation of the structure. Under earthquake, the longitudinal stress of the rail, And the displacement of the mortar layer all appear peak value at the beam seam, the maximum value of the longitudinal displacement of the fastener and the mortar layer appears near the end stab; the slip layer dissipates energy through the base plate sliding and greatly improves the seismic performance of the system; With the increase of earthquake intensity, the deformation and deformation of all the key components have greatly increased.