Abstract
The paper describes a methodology for assessing the impact resistant RC slab thickness subjected to the crash of a cylindrical thin shell 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 momentum equation is simplified to obtain the impact load. Slab thickness evaluations are performed to prevent the global flexural failure, perforation failure and the local perforation failure. Impact resistant RC slab thickness is decided to be the largest value of the above three evaluations. An example problem is analyzed and reviewed.