New Mathematical Formulation of Nonlinear Unsteady Wind Loads on Long-Span Bridge Decks under Nonstationary Winds Using Time-Delay Neural Network
Publication: Journal of Structural Engineering
Volume 148, Issue 10
Abstract
This paper presents a novel mathematical formulation of unsteady wind loads on bridge decks by using the neural network technique while incorporating the concurrent effects of nonstationary winds and aerodynamic nonlinearity. For that, a time-delay neural network (TDNN) is developed by recognizing the inputs and target outputs, wherein the inputs entail the wind speed fluctuating components and self-excited motion components, whereas the target outputs entail the buffeting load components. A typical sigmoidal function provided by the hyperbolic function is utilized to simulate the nonlinear features of the wind–bridge interaction (WBI) system. Finally, an elegant formulation for the nonlinear unsteady aerodynamic wind loads considering the nonstationary wind effects is developed in terms of synaptic weights of neurons and biases. The proposed formulation of winds loads has also been applied to a full-scale long-span suspension bridge under real typhoon winds. The buffeting analysis results are also compared with the measured displacement data, which shows the efficacy of the proposed wind load model for real-life bridge structures.
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Data Availability Statement
Some or all data, models, or code that support the findings of this study are available from the corresponding author upon reasonable request. The item list contains (1) sample codes for the TDNN-based wind load model; and (2) the finite-element model of the long-span suspension bridge.
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Published In
Journal of Structural Engineering
Volume 148 • Issue 10 • October 2022
Copyright
© 2022 American Society of Civil Engineers.
History
Received: Jan 31, 2022
Accepted: Jun 6, 2022
Published online: Aug 1, 2022
Published in print: Oct 1, 2022
Discussion open until: Jan 1, 2023
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Cited by
- Khawaja Ali, Aleena Saleem, Ali Javed, Bushra Khadim, Ajibola Ibrahim Quadri, A Simplified Approach for Dynamic Analysis of Suspension Bridges under Extreme Limit State, Practice Periodical on Structural Design and Construction, 10.1061/PPSCFX.SCENG-1523, 29, 4, (2024).
- Surbhi Aswal, K. Nallasivam, Static response of a multi-span suspension bridge subjected to highway vehicle loading, Asian Journal of Civil Engineering, 10.1007/s42107-023-00585-6, (2023).