Statistical characteristics of modal damping of long-span suspension bridge at different wind speeds

Author:

Guo Zengwei12ORCID,Shi Haobo2,Gong Huafeng1,Ma Tao3,Huang Xiaoming3

Affiliation:

1. Postdoctoral Workstation, T. Y. Lin International Engineering Consulting (China) Co., Ltd, Chongqing, China

2. State Key Laboratory of Mountain Bridge and Tunnel Engineering, Chongqing Jiaotong University, Chongqing, China

3. School of Transportation, Southeast University, Nanjing, China

Abstract

The present paper combined the natural environment excitation technology (NExT) with the eigen system realization algorithm (ERA) to identify the modal parameters of a suspension bridge. Firstly, the critical parameters in NExt–ERA, such as record length, window length, and ranks of the Hankel matrix, and their influence on identification accuracy have been discussed. Subsequently, based on the acceleration series obtained from the Xihoumen Bridge Health Monitoring System, 3015 sets of modal frequencies and modal damping ratios of the Xihoumen Bridge were identified under 7 sets of wind speeds by the NExt–ERA. Finally, the probability distribution and confidence interval of the structural modal damping ratios were analyzed. Besides, the dependence of identified frequencies damping ratios on wind speed was also discussed. The results show that at the same wind speed, the mean value, and variance of the torsional and lateral mode damping ratios are larger than those of the vertical mode, but this difference gradually decreases with the increment of wind speed. The modal damping ratios along three directions under different wind speeds all follow the generalized extreme value distribution, but wind speed affects the tailing properties of probability distribution of the vertical and torsional mode damping ratios. The estimated damping ratios could provide references for structural design and vibration control of similar long-span bridges.

Funder

National Natural Science Foundation of China

National Key R&D Project of China

Natural Science Foundation of Chongqing Municipality

Science and Technology Research Program of Chongqing Municipal Education Commission

Joint Training Base Construction Project for Graduate Students in Chongqing

Publisher

SAGE Publications

Subject

Mechanical Engineering,Mechanics of Materials,Aerospace Engineering,Automotive Engineering,General Materials Science

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