Abstract Studying the applicability of existing bridge and track systems of high-speed railway in near-fault areas is crucial and urgent, because the current seismic design methods seldom consider the characteristics of the near-fault ground motion. By comprehensively considering the uncertainties in ground motion and structural parameters, a large-sample analysis method for near-faults area was proposed. In addition, an integrated finite element model for beam bridge-track system of high-speed railway was used to calculate the seismic response of the structure under the action of near-fault ground motion. The over-limit state and applicability of seismic response of key components and systems were predicted and evaluated. The analysis results indicate that the statistical characteristics of structural seismic response and over-limit state tend to be stable with increasing number of samples. Under the near-fault ground motion: (i) the piers of high-speed railway are hard to yield (ii) bearings are damaged severely, and (iii) the piers have insufficient shear capacity and the characteristics of structural seismic damage are not in accordance with the concept of ductility design. The sliding layer of the track structure is severely damaged by the transverse and longitudinal ground motions, while the CA mortar layer and fastener are mainly damaged by the transverse ground motion. The applicability of bearings, the anti-shearing behavior of piers, and the inter-layer structure of tracks make it difficult to achieve the goal of the near-fault fortification against ground motion.

中文翻译：

---

近断层地震动作用下高速铁路系统适用性分析

摘要 研究高速铁路既有桥轨系统在近断层区的适用性是至关重要和紧迫的，因为目前的抗震设计方法很少考虑近断层地震动的特性。综合考虑地震动和结构参数的不确定性，提出了近断层区大样本分析方法。此外，利用高速铁路梁桥-轨道系统综合有限元模型，计算了该结构在近断层地震动作用下的地震反应。对关键部件和系统的地震响应超限状态和适用性进行了预测和评估。分析结果表明，随着样本数量的增加，结构地震反应和超限状态的统计特征趋于稳定。近断层地震动下：（i）高铁桥墩难以屈服（ii）支座损坏严重，（iii）桥墩抗剪能力不足，不具备结构地震破坏特征符合延展性设计的概念。横向和纵向地震动对轨道结构滑动层的破坏较为严重，而CA砂浆层和扣件则主要受到横向地震动的破坏。支座的适用性，桥墩的抗剪性能，