Experimental study on vertical dynamic coupling effect of pedestrian-structure

doi:10.14006/j.jzjgxb.2019.0464

IR > 土木工程学院

	Experimental study on vertical dynamic coupling effect of pedestrian-structure
	Zhu, Qiankun; Ma, Farong; Zhang, Qiong; Du, Yongfeng
	2020-11-05
发表期刊	Jianzhu Jiegou Xuebao/Journal of Building Structures
ISSN	10006869
卷号	41 期号:11 页码:125-133
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.
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
DOI	10.14006/j.jzjgxb.2019.0464
收录类别	EI
语种	中文
出版者	Science Press
EI入藏号	20203909230905
EI主题词	Bridge decks
EI分类号	401.1 Bridges ; 408.1 Structural Design, General ; 408.2 Structural Members and Shapes ; 921 Mathematics ; 931.1 Mechanics
引用统计	无
文献类型	期刊论文
条目标识符	https://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
第一作者单位	兰州理工大学
第一作者的第一单位	兰州理工大学
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.