Novel dynamic test system for simulating high-speed train moving on bridge under earthquake excitation

地震作用下高速铁路桥上行车动态试验系统

China’s high-speed railways are always facing the potential damage risk induced by strong earthquakes.And the route design concept of“using bridge instead of embankment”has also greatly increased the probability of high speed trains moving on bridges when a strong earthquake happens.In the past decades,a bunch of theoretical and numerical studies have been conducted in the seismic dynamic field of high-speed railway.However,the effective dynamic test system for verifying the given method and theoretical results is still lacking.Therefore,a novel dynamic test system(DTS)consisting of a shaking table array and a train-pass-bridge reduced-scale model is proposed in this paper.Through some crucial technical problems discussion,the effectiveness of similar design scheme and the feasibility of reduced-scale DTS are elaborated,and then the detailed DTS structures are given and displayed as part-by-part.On this basis,the demonstration tests are conducted and compared with the numerical simulation.The results show that the proposed DTS is accurate and effective.Therefore,the DTS can provide a new physical simulation approach to study the high-speed train’s running safety on bridges under earthquakes and can also provide a reference for the construction of related systems.

我国高速铁路运营面临强地震的潜在危险,“以桥代路”的线路设计理念导致强地震发生时高速列车运行于桥梁上的概率大幅度增加,当前已开展了较为系统的理论和数值研究,然而研究结论缺少试验验证,缺乏进行地震下高速铁路桥上行车测试的试验系统。基于此,提出了一种在实验室内测试地震作用下高速铁路桥上行车的动态试验系统(DTS),详细讨论了该动态试验系统的关键技术问题,完成了缩尺模型试验参数的相似设计,给出了详细的系统整体设计方案,并通过演示试验和数值仿真对比分析,验证了该试验系统的准确有效性。该动态试验系统可为地震作用下高速铁路桥上行车安全研究提供了切实可行的物理模拟方法,并可为国内外相关系统的建设提供参考。