Effect of Meshed Grounding Systems on the Magnetic Field Generated by a Direct Lightning Strike Inside a Reinforced Concrete Building

Abstract:
When a reinforced concrete building is struck by lightning, the current flowing through the reinforcement generates a transient electromagnetic field inside the building. The peak values of the magnetic field strength can be well estimated using analytical formulae or full-wave methods. However, it is important to consider the presence of other elements in the electromagnetic environment. Furthermore, if the reinforcement of the building is connected to a meshed grounding grid, the distribution of the peak values varies considerably. On the other hand, increasing the depth of the foundation of the building or the resistivity of the soil leads to minor changes.