Numerical Study on Transient Magnetic Field inside Ultra High-Rise Building during Lightning Stroke

Transient electromagnetic field will endanger the safety and normal operation of personnel and equipment inside the an ultra high-rise building when lightning strikes at it. The electromagnetic field method is more efficient to analyze the electromagnetic environment of lightning strike at large and complex buildings. By adopting the finite element method (FEM) in the frequency domain, the electromagnetic field method is used to evaluate the magnetic field in a building and validated by comparing with experiment results. With this method, a simplified model of the 488.9m ultra high-rise building, Chengdu Zhonghai Tower, is established and the magnetic field distribution inside this building is evaluated and analyzed. The simulation results are valuable for optimizing the installation of sensitive equipment in this building and can also give guidelines for improving the design of the lightning protection system (LPS) of ultra high-rise buildings.