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Open AccessArticle

Experimental Investigation on the Nonlinear Coupled Flutter Motion of a Typical Flat Closed-Box Bridge Deck

by Guangzhong Gao 1,2,3,*, Ledong Zhu 2,4,5,*, Feng Wang 1, Hua Bai 1 and Jianming Hao 1
1
Highway College, Chang’an University, Xi’an 710064, China
2
State Key Laboratory of Disaster Reduction in Civil Engineering, Tongji University, Shanghai 200092, China
3
Key Laboratory of Structure and Wind Tunnel of Guangdong Higher Education Institutes, Shantou 515063, China
4
Department of Bridge Engineering, Tongji University, Shanghai 200092, China
5
Key Laboratory of Transport Industry of Bridge Wind Resistance Technology, Tongji University, Shanghai 200092, China
*
Authors to whom correspondence should be addressed.
Sensors 2020, 20(2), 568; https://doi.org/10.3390/s20020568
Received: 14 November 2019 / Revised: 5 January 2020 / Accepted: 18 January 2020 / Published: 20 January 2020
(This article belongs to the Section Physical Sensors)
The nonlinear post-flutter instabilities were experimentally investigated through two-degree-of-freedom sectional model tests on a typical flat closed-box bridge deck (width-to-depth ratio 9.14). Laser displacement sensors and piezoelectric force balances were used in the synchronous measurement of dynamic displacement and aerodynamic force. Beyond linear flutter boundary, the sectional model exhibited heave-torsion coupled limit cycle oscillation (LCOs) with an unrestricted increase of stable amplitudes with reduced velocity. The post-critical LCOs vibrated in a complex mode with amplitude-dependent mode modulus and phase angle. Obvious heaving static deformation was found to be coupled with the large-amplitude post-critical LCOs, for which classical quasi-steady theory was not applicable. The aerodynamic torsional moment and lift during post-critical LCOs were measured through a novel wind-tunnel technique by 4 piezoelectric force balances. The measured force signals were found to contain significantly higher-order components. The energy evolution mechanism during post-critical LCOs was revealed via the hysteresis loops of the measured force signals. View Full-Text
Keywords: nonlinear aeroelasticity; post flutter; limit cycle oscillation; closed box bridge section; wind tunnel nonlinear aeroelasticity; post flutter; limit cycle oscillation; closed box bridge section; wind tunnel
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MDPI and ACS Style

Gao, G.; Zhu, L.; Wang, F.; Bai, H.; Hao, J. Experimental Investigation on the Nonlinear Coupled Flutter Motion of a Typical Flat Closed-Box Bridge Deck. Sensors 2020, 20, 568.

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