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Motion-amplitude-dependent nonlinear VIV model and maximum response over a full-bridge span by Zhitian Zhang is a Engineering article available to read on EtoBox.

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Nonlinear motion-amplitude ðy T Þ-dependent energy-trapping properties of a bridge model undergoing vortex-induced vibration (VIV) are investigated. Energy-trapping properties of the model undergoing a full-process from still to a limit cycle oscillation (LCO) state are identified. A van der Poltype model is adapted to describe the amplitudedependent aerodynamic properties. Nonlinear parameter-amplitude relations, eÀy T and n e Ày T , are established. Nonlinear aerodynamic damping is separated into two parts: the initial damping which varies with the reduced wind speed, and the e-related part which varies with both the reduced wind speed and the motion amplitude. The initial aerodynamic damping determines the threshold of VIV, while the e-related part dominates the evolution process and the LCO. The identified nonlinear analytical model is capable of predicting VIV responses at higher mechanical damping ratios. The energy-trapping properties of a section model in time are transformed into nonlinear properties distributed in space along an elongated 3-D elastic bridge span. According to this ''time-space'' transformation, the convection coefficient, which links the maximum response

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Author

Zhitian Zhang

Publisher

Springer Science and Business Media LLC

Published

2023

Language

EN

Field

Engineering (Physical Sciences)