Experimental study on vertical dynamic coupling effect of pedestrian-structure

doi:10.14006/j.jzjgxb.2019.0464

CORC > 兰州理工大学 > 兰州理工大学 > 土木工程学院

	Experimental study on vertical dynamic coupling effect of pedestrian-structure
	Zhu, Qiankun; Ma, Farong; Zhang, Qiong; Du, Yongfeng
刊名	Jianzhu Jiegou Xuebao/Journal of Building Structures
	2020-11-05
卷号	41 期号:11 页码:125-133
关键词	Damping Dynamic loads Flexible structures Footbridges Modal analysis Acceleration response Acceleration sensors Acceleration-time history Dynamic characteristics Long span structures Operational modal analysis Structural frequencies Structure and dynamics
ISSN号	10006869
DOI	10.14006/j.jzjgxb.2019.0464
英文摘要	For light-weight long-span structures, the interaction between pedestrian and structure will change the dynamic characteristics of the structure and pedestrian load. In this paper, the influence of vertical dynamic coupling effect of pedestrian-structure on dynamic parameters of structure and dynamic load factor of pedestrian was experimentally studied. Firstly, by testing the dynamic response of the structure when pedestrians walk down at eight different walking frequencies, 554 groups of the effective acceleration response time histories of 60 person-times were obtained for operational modal analysis. Secondly, by using the wireless six-axis Bluetooth acceleration sensor, the dynamic characteristics experiments of walking excitation under three different walking frequencies were carried out on the rigid ground and flexible bridge deck respectively, and 1 200 effective acceleration time-histories of 60 person-times were obtained for Fourier transform. The results show that, considering the vertical dynamic coupling effect of pedestrian-structure, the natural frequency of pedestrian bridge decreases slightly, the damping ratio increases significantly. With the increase of number of synchronous walking pedestrians, the change rate of structural frequency and damping ratio decreases gradually. Due to the existence of self-vibration of the bridge, the dynamic load factor on the rigid ground is larger than that on the flexible bridge deck. The experimental results show that, compared with the rigid ground, the first order dynamic load factor of the pedestrian walking on the flexible bridge deck decreases by 14.7%. The dynamic load factor fitting formula of rigid ground and flexible bridge deck of the first four order pedestrian load was given in this paper. It can provide a reference for the establishment of the biological force model considering the pedestrian-structure interaction under the flexible structure. © 2020, Editorial Office of Journal of Building Structures. All right reserved.
语种	中文
出版者	Science Press
内容类型	期刊论文
源URL	[http://ir.lut.edu.cn/handle/2XXMBERH/150800]
专题	土木工程学院
作者单位	Institute of Earthquake Prevention and Disaster Reduction, Lanzhou University of Technology, Lanzhou; 730050, China
推荐引用方式 GB/T 7714	Zhu, Qiankun,Ma, Farong,Zhang, Qiong,et al. Experimental study on vertical dynamic coupling effect of pedestrian-structure[J]. Jianzhu Jiegou Xuebao/Journal of Building Structures,2020,41(11):125-133.
APA	Zhu, Qiankun,Ma, Farong,Zhang, Qiong,&Du, Yongfeng.(2020).Experimental study on vertical dynamic coupling effect of pedestrian-structure.Jianzhu Jiegou Xuebao/Journal of Building Structures,41(11),125-133.
MLA	Zhu, Qiankun,et al."Experimental study on vertical dynamic coupling effect of pedestrian-structure".Jianzhu Jiegou Xuebao/Journal of Building Structures 41.11(2020):125-133.