Higher-Order Self-Excited Drag Forces on Bridge Decks
Publication: Journal of Engineering Mechanics
Volume 142, Issue 3
Abstract
Nonlinear features concerning self-excited drag forces induced by the vertical and torsional motions for typical deck sections are investigated comprehensively in this study. The self-excited drag forces are calculated using computational fluid dynamics (CFD)-based numerical simulations. In a conventional analysis framework, the self-excited drag force is modeled as a linear function of the structural motions. However, the simulation results from CFD indicate that in many instances, the second-order (nonlinear) component of the self-excited drag force is more significant than the first-order (linear) component. To enhance the modeling fidelity of a conventional aeroelastic analysis framework on the basis of the semiempirical flutter derivative concept, a nonlinear mathematical model for characterizing both the first- and second-order components is developed to better quantify the self-excited forces and more accurately extract the flutter derivatives. Its efficacy and superiority compared with the traditional linear model is verified using different deck sections. For asymmetric bluff sections, the first-order self-excited drag force components are more significant than the higher-order ones. However, for streamlined plate-like sections and symmetric deck sections, i.e., streamlined and bluff, the second-order self-excited drag force components are predominant. For such cases, the proposed nonlinear model is more appropriate. The proposed nonlinear mathematical model can help to serve as a building block for developing an overall nonlinear analysis framework for accurately simulating nonlinear aerodynamics and the aeroelasticity of long-span bridges.
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Acknowledgments
The research is jointly supported by the National Science Foundation of China (51178086 and 51478087) and an opening project from the Key Laboratory of Wind Resistant for Transportation and Bridge by Ministry of China (KLWRTBMC13-01), which are gratefully acknowledged.
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Published In
Journal of Engineering Mechanics
Volume 142 • Issue 3 • March 2016
Copyright
© 2015 American Society of Civil Engineers.
History
Received: Feb 5, 2015
Accepted: Sep 29, 2015
Published online: Dec 14, 2015
Published in print: Mar 1, 2016
Discussion open until: May 14, 2016
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