Simplified theoretical treatment of lateral structural properties under crowd excitation

Mathematical Models in Engineering

Yun Dong¹  Yan An Gao¹  Ye Zhu¹  Peng Zhang¹ 

[1] Faculty of Architecture and Civil Engineering, Huaiyin Institute of Technology, 223001, China;

关键词: lateral vibration;    dynamic properties;    crowd excitation;   

DOI  :  10.21595/mme.2018.20177

来源: DOAJ

【 摘 要 】

Walking crowd-induced lateral vibrations on slender structures have attracted considerable attention. The improper vibration of a structure adversely affects human comfort. To explore the effects of crowds on lateral structural properties, a pedestrian from a crowd is simulated by a walking bipedal robot. A simplified theory for structural vibration is proposed based on the assumptions of uniform distribution and synchronized walking of pedestrians. This theory can be used to describe the effect of the change in crowd size on lateral structural damping and the frequency of the structure. The method can estimate the variations in structural properties in the case of a certain crowd for engineering design. The results show that the increase in crowd size results in decrease in structural natural frequency in the lateral direction, but increases structural damping. The influence of the crowd on structural properties agrees well with the non-simplified model. Change in walking frequency has little influence on the structural properties. However, the continuous increase in crowd size on structure top causes a non-convergent amplification of dynamic response under a resonant walking excitation. This research provides a quantitative assessment on the effect of crowd size on the change in structural properties for structural design or serviceability evaluation.

【 授权许可】

Unknown