Dynamic Performance of a Slender Truss Bridge Subjected to Extreme Wind and Traffic Loads Considering 18 Flutter Derivatives
Publication: Journal of Aerospace Engineering
Volume 32, Issue 6
Abstract
The aerodynamic performance of long-span bridges under extreme environmental conditions, such as under strong winds and heavy traffic, is critical for bridge design. Either free vibrational or forced vibrational tests are usually carried out to obtain the flutter derivatives, either traditional eight flutter derivatives from two-degree-of-freedom (2-DOF) model tests or 18 flutter derivatives from 3-DOF model tests, to evaluate structural dynamic performance. In the present study, an experimental facility is developed based upon a digitally controlled 3-DOF forced vibration system to enable the extraction of 18 flutter derivatives of bridge decks through wind-tunnel tests. After validating the proposed forced vibration test facility using typical section types, i.e., a thin-plate section and a truss-girder section, the 18 flutter derivatives for the truss-girder section are extracted and used for bridge dynamic performance assessment considering combined loads from traffic and wind. The case study of a truss bridge shows that ignorance of the additional 10 flutter derivatives can result in a significant overestimation of the bridge lateral responses, especially under high wind speeds. However, ignorance of the additional 10 flutter derivatives on the bridge vertical and torsional responses, as well as on the dynamic responses of the running vehicles, are not significant. Similar observation were also applied to the stress responses at the critical location of the bridge deck.
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Acknowledgments
The research is supported by Natural Science Foundation of China under Grant Nos. 51478181, U1534206, 50908085, and 91215302 and by the China Scholarship Council (No. 201506135039), which are gratefully acknowledged. The authors also would like to express great thanks to Professor Kun Luo and Professor Zhongyu Cheng, who provided great assistance with the development of the 3-DOF forced vibration system.
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Published In
Journal of Aerospace Engineering
Volume 32 • Issue 6 • November 2019
Copyright
©2019 American Society of Civil Engineers.
History
Received: Sep 11, 2018
Accepted: Apr 1, 2019
Published online: Jul 19, 2019
Published in print: Nov 1, 2019
Discussion open until: Dec 19, 2019
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