A hybrid vibration mitigation method based on the crowd flow control and tuned mass damper on a footbridge

doi:10.1016/j.engstruct.2021.112972

CORC > 兰州理工大学 > 兰州理工大学 > 土木工程学院

	A hybrid vibration mitigation method based on the crowd flow control and tuned mass damper on a footbridge
	Zhu, Qiankun 1,2; Yang, Wenbin 1; Zhang, Qiong 1,2; Du, Yongfeng 1,2
刊名	Engineering Structures
	2021-10-15
卷号	245
关键词	Damping Flow control Numerical methods Stereo image processing Vibration analysis Vibration control Crowd density Crowd flows Hybrid mitigation method Input energy Mitigation methods Social force models Time-varying coupling model Tuned mass dampers Vibration mitigation Vibration mitigation rate
ISSN号	01410296
DOI	10.1016/j.engstruct.2021.112972
英文摘要	This study proposes a hybrid mitigation method based on the crowd flow control and the eddy current tuned mass damper to control the excessive vibration caused by the random crowd excitation. The vibration mitigation method is applied on an experimental footbridge under random crowd loads and then the mitigation performance is analyzed experimentally and numerically. The numerical method of the social force model is used to simulate pedestrians detour behaviour in a blocking scenario. The time-varying coupling model of the crowd-structure-tuned mass damper is established, and the structure response is investigated. A virtual three dimensional obstacle based on the pedestrian stereo vision on the laboratory footbridge is designed to avoid the accident that pedestrians may encounter caused by the actual obstacles. It was found that the numerical response is in an appropriate agreement with the experimental data, implying that the social force model can simulate the detour behaviour accurately. Finally, the mitigation strategies are numerically implemented on an indoor footbridge, and the factors influencing the vibration mitigation rate are further analyzed using three different layouts. The layouts include Layout 1, for forcing pedestrian diversion separation, and Layout 2, for generating a bottle neck effect, and Layout 3, a nonlinear layout mode of obstacles, which is a combination of Layouts 1 and 2. The results show that the performance of the proposed hybrid mitigation method is more effective than the single mitigation method. In addition, the results show that the number and layout of obstacles determine the mitigation efficiency. It was also found that the vibration mitigation rate of the hybrid method with Layout 3 increases with the crowd density and tends to be stable when the crowd density exceeds 0.92 ped./m2. In addition, the mixed layout scheme may have more advantages in controlling crowd motion under high crowd density, while the linear layout schemes have certain competitiveness under low crowd density. © 2021 Elsevier Ltd
WOS研究方向	Engineering
语种	英语
出版者	Elsevier Ltd
WOS记录号	WOS:000704364000001
内容类型	期刊论文
源URL	[http://ir.lut.edu.cn/handle/2XXMBERH/150738]
专题	土木工程学院
作者单位	1.Institute of Earthquake Protection and Disaster Mitigation, Lanzhou University of Technology, Lanzhou; 730050, China; 2.Western Center of Disaster Mitigation in Civil Engineering of Ministry of Education, Lanzhou University of Technology, Lanzhou; 730050, China
推荐引用方式 GB/T 7714	Zhu, Qiankun,Yang, Wenbin,Zhang, Qiong,et al. A hybrid vibration mitigation method based on the crowd flow control and tuned mass damper on a footbridge[J]. Engineering Structures,2021,245.
APA	Zhu, Qiankun,Yang, Wenbin,Zhang, Qiong,&Du, Yongfeng.(2021).A hybrid vibration mitigation method based on the crowd flow control and tuned mass damper on a footbridge.Engineering Structures,245.
MLA	Zhu, Qiankun,et al."A hybrid vibration mitigation method based on the crowd flow control and tuned mass damper on a footbridge".Engineering Structures 245(2021).