Progressive collapse design of a union square reticulated concrete shell structure
In the accident of a derailed high-speed train driving into a railway station,the train can impact the canopy columns,which results in progressive collapse of canopy structure.Considering this risk,a design to resist progressive collapse was performed for the canopy structure of Zhengzhou South Railway Station constructed by using union square reticulated concrete shell.Multi-scaled finite element models of the structure were built,and the alternate path method was applied to analyze the dynamic behavior of the remaining structure.Results show that local collapse occurs with failure areas of 775,2 074,547m2 for the removal of the side column,the column adjacent to the side column and the middle column respectively.However,failure does not propagate and progressive collapse does not happen.To improve the structural performance to resist progressive collapse,the original structural design was modified with the consideration of load-carrying characteristic of the remaining structures,resulting in the failure areas of 775,0,0 m2 for the removal of the side column,the column adjacent to the side column and the middle columns respectively,and local failure of the canopy structure was prevented.
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