Abstract
Studies on impact effects of trains on the railway bridge are important for ensuring the reliability of bridge and the safety of train operation. This paper presents an experimental study on the dynamic effects of moving trains on a long-span railway continuous beam bridge. The dynamic responses of the bridge under the moving trains were measured through in-situ testing and finite element analysis. The influences of the moving trains and track irregularity are considered. The investigated influencing factors include the weight and speed of the train and the irregularity of the track on the bridge. The results indicate that the train’s speed does not have obvious influence on the impact factor, while train’s weight and track irregularity have notable effects on the impact factor. But from the overall development law, with the increase of train speed, the impact factor increases. The impact factors obtained in this study are larger than the values provided by the China bridge design codes, which indicates that the bridge code underestimates the impact effect of the train on the bridge. The design value of the impact factor should be properly improved in the bridge design.
Highlights
When a train passes a bridge at a certain speed, there are interactions between the train and the bridge
The impact factors obtained in this study are larger than the values provided by the China bridge design codes, which indicates that the bridge code underestimates the impact effect of the train on the bridge
Finite element analysis is performed to help understand the experimental results, and study the impact effect of trains running at high speeds on the bridge, as will as the impact effect of different types of vehicles on the bridge
Summary
When a train passes a bridge at a certain speed, there are interactions between the train and the bridge. Gou et al [14,15,16] carried out field tests to study the dynamic effects of moving trains on various kinds of railway arch bridge, including the long-span continuous rigid frame arch bridge, asymmetrical arch bridge and hybrid framed arch bridge. Analyzed the dynamic response of the world’s longest steel box tied-arch bridge under moving trains by field measurement. They found that the poor road surface roughness can greatly increase the IM, and the train braking can produce a larger IM. The static and dynamic load tests of the Yexihe Bridge, which is the longest continuous-girder, high-speed railway bridge in China, were carried out to investigate the dynamic responses of the bridge under design moving loads. A finite element model was established to analyze the influence of the train’s speed and type, and track irregularity
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