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Dynamic response of a multi-span suspension bridge subjected to highway vehicle loading

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Abstract

Suspension bridges have become increasingly popular in recent decades due to their attractive look, effective use of structural materials, and other noteworthy features. The popularity of suspension bridges has skyrocketed among bridge engineers. These bridges are earthquake-resistant and have excellent spanning capacities. They reduce the quantity of foundation excavation and obviate the need for tall piers. Suspension bridges are hence the preferable choice when constructing long-span bridges. The interaction between the bridge and the vehicle makes it difficult to predict how a bridge will react to a moving vehicle. In addition to wind and earthquake loads, high-speed vehicle vibration must also be taken into account when designing bridges for earthquake resistance. The main goal of this study is to investigate how a multi-span suspension bridge structure responds dynamically to vehicles moving at various speeds in terms of displacement, velocity, and acceleration. In the past, the majority of research has focused on the bridge's dynamic or impact reaction rather than the response of the moving cars. This paper proposes a modeling approach for the evaluation of a multi-span suspension bridge with an orthotropic steel-box deck using the finite-element method and analyzes the various dynamic response properties of the bridge when it is loaded in accordance with various IRC loading instances, such as IRC Class A vehicle loadings and IRC 70R wheeled vehicle loading cases. Using ANSYS, finite-element method-based software, a three-dimensional finite-element model has been created. The bridge has been assessed at average vehicle speeds between 50 and 200 km/h. The proposed findings can be implemented as a revision to the IRC requirements for both short- and long-span highway bridges. The results of this investigation indicate that the vehicle’s speed has a significant impact on the dynamic responses of the bridge. The values of total acceleration, total velocity, and equivalent stress are maximum in case of IRC Class 70R wheeled ‘M’ type vehicle loading 86.626 mm/sec2, 61.944 mm/sec, and 33.094 MPa, respectively. The modeling approach described above can be used to examine any multi-span suspension bridge.

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Data availability

The data that were used in this research were produced using simulation results. The model and inputs are accessible via email at 21mce115@nith.ac.in.

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Acknowledgements

I want to acknowledge the Civil Engineering Department of the National Institute of Technology in Hamirpur for providing computational resources for this research.

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  1. National Institute of Technology Hamirpur, Hamirpur, Himachal Pradesh, India

    Surbhi Aswal & K. Nallasivam

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  1. Surbhi Aswal
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  2. K. Nallasivam
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SA, NK: framed, SA: modeled, SA: analyzed, SA: formatted, and NK: edited. The final document was read and approved by the author(s).

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Correspondence to Surbhi Aswal.

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Aswal, S., Nallasivam, K. Dynamic response of a multi-span suspension bridge subjected to highway vehicle loading. Asian J Civ Eng 24, 2467–2479 (2023). https://doi.org/10.1007/s42107-023-00655-9

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