Human-Induced Vibration Response Based on the Enhanced Semi-Sine Model
In order to investigate the effects of jumping loads on structural vibrations.Firstly,an improved semi-sine model was proposed,and characteristic parameters for the crowd jumping load model were suggested.Next,an analytical solution for the dynamic response of a simply supported beam under a single person's jumping load was derived.Finally,using a pedestrian footbridge in Jing-zhou City as an example,the experimental and numerical results of the structural acceleration response under jumping loads were com-pared to validate the applicability of the improved semi-sine model.The results show the improved semi-sine model exhibits a maximum error of 2.8％when compared to experimental measurements.In contrast,the semi-sine and semi-sine squared models exhibit corre-sponding maximum errors of 23.4％and 7.1％,respectively.At a jumping frequency of 2.3 Hz,the jumping load frequency closely approximates the first-order natural frequency of the structure,resulting in resonance within the structure.In the mid to high-frequency range,the response results of the improved semi-sine model closely align with experimental measurements.These results hold valuable insights for accurately simulating jumping loads.
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