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

Abstract

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 highspeed 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.

Keywords

strong earthquake / high-speed train / shaking table test / dynamic test system / similar design / bridge

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