Evaluation of lightning induced magnetic fields inside reinforced concrete buildings

Abstract : In this paper, the shielding effectiveness of a reinforced concrete building against lightning induced effects is analyzed. Measurements of magnetic fields induced inside such a structure stressed by a lightning type of aggression are used to setup numerical models of the building with three distinct methods: the method of moments (MoM) with the CDEGS software, the Transmission Line Method (TLM) with CST's MWS software and LR equivalent circuit simulation technique with ONERA's LIRIC computer code. Once the limitations of the numerical models are identified, they are used to study the effect of a standard lightning strike in terms of magnetic fields inside the structure.