Dynamic analysis of grandstands and stadiums Eigenvalue and Dynamic analysis Wind loading Crowd loading When designing grandstands and stadiums the real challenge for a structural engineer is not the static strength or sti?ness of the structure but the way in which the structure responds to the imposed dynamic loadings from both crowds and wind. With modern stadium design requiring large cantilevers to give clear views and protection from the weather there is a potential for these roofs to be quite lively structures. Accurate prediction ofthe natural frequencies and calculation of the e?ects of the imposed loadings is therefore very important. The UK Guide to safety at sports grounds speci?es that where a seating deck has a vertical frequency of less than 6Hz or a sway frequency of 3Hz the

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