![]() The vibration from normal pedestrian traffic should not cause discomfort to users so that is why the code specifies a limit defined as an acceleration limit. Dynamic effects of walking pedestrians can be represented by a periodic force and this force will have a typical frequency of between one and three hertz. In the horizontal direction, the effects of walking pedestrians would have a frequency between 0.5 and 1.5 hertz. And if there’s a group of joggers crossing a bridge, that may induce forces with a frequency about three hertz so we can see that this range say from 0.5 to 3 hertz would be a critical spectrum. ![]() #Load combination uls in midas civil how to#Īnd if any of the natural frequencies of the structure is within this spectrum there is a risk of issues related to the vibration or stability so specific models and detail criteria how to fulfill it and how to achieve that the structure is stable. ![]() #Load combination uls in midas civil how to#.
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