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The paper describes a methodology for assessing the impact resis 匸 ant RC siab thickness subjected to the crash of a cylindrical thin she1 ［with a soft pipe ． Assuming that the cylindrical thin shell behaves as a fluid type body and the inside pipe behaves as a soft body ， the momen 田 m cquation is simplified to obtain the impact load ． Slab thickness evaluations are perforrned to prevent the global flexural fai ］ ure ， perforation fuilure und the local perf ｛ )radon fail − ure 」mpact resistant RC slab thickness is decided to be the largest value ofthe above three evaluations ， An example problem is analyzed and reviewed．