Abstract
The box girder bridges constructed using the balanced cantilever construction method have been widely adopted to avoid damage due to unequal settlement of the foundations. The balanced cantilever type bridges are distinct from the other bridges in support conditions and are particularly useful for long-span length. The correct estimation of the impact factor due to vehicle bridge interaction force is essential for designing such bridges. This issue has been addressed in the present work, and a simple expression for the impact factor estimation of balanced cantilever-type bridges has been suggested. The suggested impact factor expression is a function of bridge span length and road surface condition (RSC). The study has been performed on different bridge span lengths, different vehicle speeds, and five different RSCs. The ASSTHO HS20-44 Truck has been considered for the vehicle bridge interaction analysis. A generated MATLAB code has solved the dynamic vehicle–bridge interaction coupled equation, and the modal properties of the bridge have been extracted from the FEM software MIDAS civil. The developed simple expression in terms of bridge span length and RSC to estimate impact factor can be used for the design and performance evaluation of balanced cantilever-type bridges.
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Nunia, B., Prashanth, J. & Choudhury, S. Development of impact factor expression for the design and performance evaluation of long-span-balanced cantilever-type prestressed box girder bridges. Innov. Infrastruct. Solut. 8, 296 (2023). https://doi.org/10.1007/s41062-023-01251-1
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DOI: https://doi.org/10.1007/s41062-023-01251-1