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Analysis on Impact Load and Damage Evolution of U-type Girder Under Train Lateral Collision(PDF)


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Analysis on Impact Load and Damage Evolution of U-type Girder Under Train Lateral Collision
ZHANG Jing-feng1 JING Yuan1 ZHANG Nan2 LI Xiao-zhen3 ZHANG Gang1
(1. School of Highway, Chang'an University, Xi'an 710064, Shaanxi, China; 2. School of Civil Engineering, Beijing Jiaotong University, Beijing 100044, China; 3. School of Civil Engineering, Southwest Jiaotong University, Chengdu 610031, Sichuan, China)
[WT]train derailment U-type girder collision analysis impact load damage evolution
For the purpose of investigating the impact load characteristic and damage evolution process of U-type girder under derailed train collision, the numerical simulation was conducted under various impact masses, velocities and angles of vehicle through explicit dynamic analysis. The impact load time histories, as well as the peak values, mean values and impulses of impact loads were compared and analyzed. The damage characteristic and evolution of U-type girder were also studied and discussed under impact loads through nonlinear transient analysis. The analysis results demonstrate that the impact load presents a two-phase character. In the 1st phase, the impact load reaches its peak value instantly and the load duration is relatively short. Whereas the impact load is at a lower level and has a longer duration in the 2nd phase. The overall duration of impact loads ranges from 35 ms to 60 ms. The impact loads are less influenced by the vehicle impact mass, while the peak values and impact impulses of impact loads go up significantly and linearly with the increases of impact velocity and angle. The impact angle affects the mean value of impact load with a more prominent way than the impact velocity. The peak impact loads almost for all cases are 2.5 times larger than the mean impact loads with respect to time, and a maximum ratio of 3.5 can be obtained. The damage of U-type girder occurs at the web and bottom plate firstly, and then extends to transition zone of web and flange. The upper part of web suffers severe damage finally. The damage of U-type girder under impact load mainly occurs at the web, as well as the connection of web and bottom plate. The flange of U-type girder shows significant plastic lateral deformation under impact load. The weak region that suffers damage should be paid significant attention to the structure design.


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Last Update: 2019-07-26