A study on stochastic crowd load model based on crowd density

GUO Rui, REN Yu, WANG Shuangxu, PAN Yi

Journal of Vibration and Shock ›› 2021, Vol. 40 ›› Issue (20) : 255-263.

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Journal of Vibration and Shock ›› 2021, Vol. 40 ›› Issue (20) : 255-263.

A study on stochastic crowd load model based on crowd density

  • GUO Rui1,2, REN Yu1, WANG Shuangxu1,3, PAN Yi1,2
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Abstract

The existing stochastic crowd load model is only composed of a single load model, and the influence of crowd density on structural vibration is not considered.Therefore, it is very important to establish a stochastic crowd load model which can describe the walking characteristics of pedestrian.In this paper, a steel truss pedestrian bridge was taken as the research object.By using the method of field vibration test and numerical simulation, the influence of crowd density on the vibration response of the pedestrian bridge was studied.Based on the existing stochastic crowd load model, a crowd load model considering the change of crowd synchronization rate and walking frequency with the change of crowd density was proposed, and the relevant tests of other scholars were used, the validity and applicability of the model were verified by the test data.The results show that: the crowd synchronization rate and walking frequency will change with the crowd density; when the crowd density is less than 1 person/m2, the pedestrian bridge vibration response is positively correlated with the crowd density; when the crowd density is more than 1 person/m2, the pedestrian bridge vibration response is negatively correlated with the crowd density; the relative error between the calculated value and the test value based on the crowd density load model is 5.0%~12.2%, which proves that the stochastic crowd load model established in this paper can better simulate the load effect of crowd walking.

Key words

pedestrian bridge / vibration response / crowd density / crowd load model / numerical simulation

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GUO Rui, REN Yu, WANG Shuangxu, PAN Yi. A study on stochastic crowd load model based on crowd density[J]. Journal of Vibration and Shock, 2021, 40(20): 255-263

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