Dynamic Response Of Beam String Structure From Train Derailment

Around the world in the 21st century frequent train derailment accident and causing heavy casualties and economic losses, structural damage occurred in the open air derailment caused by the accident is not yet have continuity, for the railway station of such personnel-intensive large-scale transportation hub, train tracks throughout the interior passenger station, the train derailment accident once, not only will damage the structure, the structure is more likely to lead to progressive collapse, followed by raw unimaginable disaster.Through the survey, both in the domestic high-speed rail passenger station canopy structure, beam string proportion of canopy structure is relatively large, the permeability of the room for the pursuit of the station, the station house structure more choice in the column under the site, which but also to derail the train station pole crash left a security risk, and that such structures are generally less redundancy, more independent, the ability to resist progressive collapse is weak, so the beam string canopy structure in effect derailed train crash study the dynamic response under imminent.Numerical simulation of this paper is to set up and use the finite element mesh hypermesh10.0 by AUTOCAD2012, boundary conditions by LS-PREPOST (LS-DYNA common front processor) were applied by the LS-DYNA software locomotive and canopy structure of Beam String calculate the impact of the strike action under the structural dynamic response of beam string to do the analysis, comparison of the different boundary conditions, the impact of the early impact of the different impact velocities under dynamic Response. The main contents and research results are as follows:1. Collision velocity greater impact on the internal forces, which will affect the impact of substance with the impactor mass maximum internal force is relatively small.2. Structural stress response is a certain lag time, although very short time interval. And the transfer of energy is the first contact to the outer part of the load transfer to the surrounding of the center, similar to some extent to pass when the earthquake seismic waves, vibrating back and forth under the action of the upper structure made of the energy waves, and due to its the damping effect, the magnitude of vibration will become increasingly smaller, until finally resting.3. Initial speed train crash 5.22m/s-11.75m/for the safe range, the upper beam string structure will not damage occurred within the scope of s, the material does not yield, webs instability does not occur.4. When the train at a speed of 7.83m/s with different boundary conditions the station house structural columns collision occurred, the station house construction will not damage occurred.5. Simply supported beam structure type string connecting nodes, internal force beam elements, cable elements are larger than the continuous beam string, webs opposite internal forces. Continuous beam string structure to resist impact load performance is stronger than simply supported type...