Evaluation of Dynamic Behaviors of Girders in High-Speed Railway Bridges Under Dynamic Impact of Electric Multiple Unit and Push–Pull Trains

Due to the demand for the construction of a high-speed railway HSR system in Vietnam, a study on the selection of suitable technology is an important task. Currently, two train technologies, i.e., electronic multiple unit (EMU) and push–pull train (PP) are the most feasible options that can be applied in Vietnam. The EMU or PP has its advantages and scope of application. Additionally, the different train technology leads to a difference in related infrastructure, especially bridges, one of the most common structures in HSR lines. Nowadays, the determination of the concordance of bridge span structures considering dynamic effects on HSR routes of trains at the speed over 200 km/h is of interest not only in Vietnam but also in the world. In many recent HSR projects, the applications of box girder bridges become more and more popular. However, one of the major disadvantages of box girders is the large cross-sectional height, which makes the box girder much more expensive in comparison with simple common girders. Hence, this work analyzes the dynamic behavior of several simple girders. Thereafter, the dynamic outcome is compared with that of the box girder bridge with the aim to evaluate the applicability of beams for superstructure railway bridges. Finally, the recommendation of suitable train technology for HSR lines in Vietnam is provided.