Vibration and comfort analysis of steel composite pedestrian bridge

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A number of load modes and comfort design guidelines, with the purpose of analyzing the comfort level of target structure, has been introduced in the last few years. The approaches to these issues have in many cases been very different in both how much in detail it goes when describing the pedestrian load and to what extent the load case has to be considered. Due to the complexity of modelling the human induced load and applying the load on the structure, researches on these topics are undergoing currently. Different approaches have been provided by the two guides. The HANDBOOK 4 proposes load models for a single pedestrian, a group of pedestrians and a crowd and treats them as non-moving harmonic loads. While the British National Annex suggests load models for walking pedestrians, joggers and represents them as harmonic loads that cross the bridge at a certain speed. A widely used load model is adopted to perform more dynamic calculation so as to taking into account load cases which are not covered by the guides. 12 more load cases are considered with assumptions about the walking velocity, stripe length, the density of the pedestrians and step frequency.