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(searched for: doi:10.1186/s43251-020-00030-7)
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, , Chong Lin, , Xiaofang Zeng, Zhengdong Chen
Published: 5 September 2021
Structures, Volume 34, pp 1614-1635; https://doi.org/10.1016/j.istruc.2021.08.084

Abstract:
From the field observations of bridge deck failures under extreme waves, it is shown many bridge decks were laterally displaced at varying displacements on the pier caps, and some decks with large lateral displacements even fell into the water. The repair cost varies with the lateral deck displacement, especially between different bridge states (Fixed state, Partially-displaced state, Falling-down state) after the disaster. To the author's knowledge, a comparative study of lateral displacements for T-deck and Box-deck under extreme waves has not been conducted. This paper discusses some fundamental questions related with the lateral deck displacement: (1) What are the influences of three essential parameters (relative clearance, wave height, deck weight) on the lateral displacements for two kinds of bridge decks? (2) Which kind of bridge deck is safer under the extreme solitary waves? In other words, is the lateral displacement of T-deck always larger or smaller than the Box-deck? (3) Does a larger horizontal or vertical wave force on two decks always induce a fiercer lateral motion response? (4) What is the most vulnerable condition for the failures of T-deck and Box-deck? Motivated by these questions, a comparative research on the wave-deck interactions for two movable decks under solitary waves is conducted by a numerical model solving the Navier-Stokes equations. A total of 330 numerical experiments based on this model have been designed to dynamically study the lateral responses of two bridge shapes under various conditions. This study provides researchers an insight into the dynamic properties for T-deck and Box-deck under solitary waves, and improves our understanding of the fragility of two decks under extreme waves.
Published: 24 May 2021
Engineering Structures, Volume 242; https://doi.org/10.1016/j.engstruct.2021.112493

Abstract:
This paper proposes a comprehensive framework for performance and reliability analyses of coastal bridges under hurricane surge and waves, including a three-dimensional (3D) Computational Fluid Dynamics (CFD) model to simulate the wave-structure interaction, laboratory experiments to improve the model accuracy, a 3D Finite Element Model (FEM) to evaluate bridge and component responses, surrogate models for performance prediction, as well as effects of uncertainties and climate changes in long-term vulnerability analyses. The experimental validation ensures the credibility of the established model and computational results. For accurate and efficient quantification of the structural responses under different surge and wave conditions, surrogate models are introduced for the investigated scenarios, which could not be well predicted by using existing methods. Based on the detailed 3D CFD and FEM results, a new component-level overturning failure mode of a bridge subjected to the hurricane is developed by considering wave forces, overturning moments, bearing damages, and uncertainties in structural and hazard parameters. Given fragility surface and potential changing climate scenario, long-term reliability analysis is performed. The established framework could be accurately and widely applied to other bridges and hurricane scenarios by adjusting the model and experimental parameters. This study could help in exploring the resistance of coastal bridges against natural hazards, and in developing specifications to mitigate future hurricane risk.
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