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Over the years, many soccer stadiums in Brazil have been designed to withstand accidental loads (people loads) to be of static type. However, based on the changes in the people’s behaviour, especially in soccer matches, through the action of groups of fans and also with the use of these structures for rock concerts, these structural systems have been subjected to dynamic impacts related to the dynamic nature of the applied loads. Therefore, some of these stadiums in Brazil have presented excessive vibration problems and have required an effective consideration of the dynamic loadings in the structural design. This way, this paper aims to study the dynamic structural behaviour and also evaluate the human comfort of the Brasilia National Stadium grandstands. This study will be backed by the use of two different mathematical models, representative of the people dynamic loadings, developed based on extensive experimental campaigns. Throughout this research work, a numerical analysis is carried out, in order to determine the natural frequencies and the vibration modes of the investigated structure to characterize the dynamic behaviour of the grandstands. After that, the dynamic structural response of the system is investigated, contemplating a critical analysis of the maximum acceleration values (peak accelerations), RMS accelerations and vibration dose values (VDV). The results achieved in this investigation are compared with those provided by design standards and international recommendations. The presented results show the relevance of the dynamic analysis on the structural design of soccer stadiums, with respect to obtaining relevant data for human comfort and as well safety of users of this type of structure.