Study On The Collapse Behavior Of Non-platform-Column Beam String Shelters Of High-Speed Railway Stations Under The Impact Of Derailed Trains

A lot of train derailment accidents occurred frequently in the 21st century around the world and caused heavy casualties and economical losses. Some train derailment accidents happened in the open-air and the structural damage because of them had not yet been continuity. Railway station is a personnel-intensive major transportation hub and the train tracks throughout the interior station, when train derailment accident happens it will not only cause structural damage but also most likely cause structural progressive collapse and will make unimaginable secondary disasters.Shelters are usually located near the site of railway tracks and the passengers waiting at those shelters directly face the risk of suffering train derailment accidents and the secondary disasters. The number of non-platform-column beam string shelters occupies a large proportion in the current existing domestic railway station shelters and beam string structures generally have worse performance in resist collapse because of their low degree of redundancy. It is imminent to study the collapse behavior of beam string shelters under the impact of derailed trains.In this paper the numerical simulation of the collapse behavior of typical beam string shelters based on alternate path method is represented and the simulation of a multiscale beam string shelter model under the impact of a full-scale derailed train model is represented at the same time. The main research results are as follows:Only partial collapse occurred in the beam string shelter structure within one column failed by those two research methods above and the progressive collapse didn’t happen in those simulations.When the corner columns or the middle side columns failed or those columns and their adjacent columns failed at the same time, the collapse of shelters are more serious. The comparative analysis about the collapse behavior of two beam string shelters based on alternate path method demonstrated that the main factors of the resist collapse performance of beam string structures are construction measures such as diagonal bars in columns and purlins and the distance between every two beam strings.The impact simulation demonstrated that columns of the shelter will not be obviously broken under the impact of the train derailed from the arrival and departure tracks and columns of the shelter will be broken under the impacted of the train that derailed from the main tracks. The train most likely will strike another columns because it remains have a high speed after its first impact.This paper also illustrated that the effectiveness of alternate path method in the analysis and design of structural collapse behavior in the field of engineering by the comparative analysis of those two research methods.