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Fatigue Life Evaluation of Corroded Steel Truss Bridge Girder
https://orcid.org/http://orcid.org/0000-0001-9243-695X
https://orcid.org/http://orcid.org/0000-0002-0681-377X
https://orcid.org/http://orcid.org/0000-0001-8671-620X
Truss bridges are one of the most typical configurations used for the medium- to long-span steel bridges. Under railway loading, such bridges are subjected to reversal of loads, leading to fatigue damage. Fatigue life is affected by corrosion, as corrosion reduces the net section available for resistance and also affects the regions of connections and bearing locations. Pitting corrosion in small areas leads to formation of small pits, which on application of fatigue load develop as cracks. Due to the reduced cross-sections, the pits cause stress accumulation and behave like stress raisers. Together with the stress concentrations, the residual stresses form the datum for stress reversals, during loading cycles of vehicles. These actions compound up to result in the enhancement of initial cracks (due to residual stresses and material reshaping). The damaging effect of corrosion and fatigue is interwoven, and superposing independent results will lead to erroneous over-estimations. Therefore, to determine the structure's service life, a time-based coupled assessment of corrosion and fatigue is required. In order to relate to real-world scenario, the deterioration of the bridge needs to be observed under the effect of incremental train speed. Hence, in this study, a numerical model of a truss bridge span using currently available codes is developed. The cross-girder and stringer, which experience high levels of fatigue stresses and corrosion, are numerically assessed for their residual life due to increasing train speed and daily carriage volume.
Fatigue Life Evaluation of Corroded Steel Truss Bridge Girder
https://orcid.org/http://orcid.org/0000-0001-9243-695X
https://orcid.org/http://orcid.org/0000-0002-0681-377X
https://orcid.org/http://orcid.org/0000-0001-8671-620X
Truss bridges are one of the most typical configurations used for the medium- to long-span steel bridges. Under railway loading, such bridges are subjected to reversal of loads, leading to fatigue damage. Fatigue life is affected by corrosion, as corrosion reduces the net section available for resistance and also affects the regions of connections and bearing locations. Pitting corrosion in small areas leads to formation of small pits, which on application of fatigue load develop as cracks. Due to the reduced cross-sections, the pits cause stress accumulation and behave like stress raisers. Together with the stress concentrations, the residual stresses form the datum for stress reversals, during loading cycles of vehicles. These actions compound up to result in the enhancement of initial cracks (due to residual stresses and material reshaping). The damaging effect of corrosion and fatigue is interwoven, and superposing independent results will lead to erroneous over-estimations. Therefore, to determine the structure's service life, a time-based coupled assessment of corrosion and fatigue is required. In order to relate to real-world scenario, the deterioration of the bridge needs to be observed under the effect of incremental train speed. Hence, in this study, a numerical model of a truss bridge span using currently available codes is developed. The cross-girder and stringer, which experience high levels of fatigue stresses and corrosion, are numerically assessed for their residual life due to increasing train speed and daily carriage volume.
Fatigue Life Evaluation of Corroded Steel Truss Bridge Girder
https://orcid.org/http://orcid.org/0000-0001-9243-695X
https://orcid.org/http://orcid.org/0000-0002-0681-377X
https://orcid.org/http://orcid.org/0000-0001-8671-620X
Truss bridges are one of the most typical configurations used for the medium- to long-span steel bridges. Under railway loading, such bridges are subjected to reversal of loads, leading to fatigue damage. Fatigue life is affected by corrosion, as corrosion reduces the net section available for resistance and also affects the regions of connections and bearing locations. Pitting corrosion in small areas leads to formation of small pits, which on application of fatigue load develop as cracks. Due to the reduced cross-sections, the pits cause stress accumulation and behave like stress raisers. Together with the stress concentrations, the residual stresses form the datum for stress reversals, during loading cycles of vehicles. These actions compound up to result in the enhancement of initial cracks (due to residual stresses and material reshaping). The damaging effect of corrosion and fatigue is interwoven, and superposing independent results will lead to erroneous over-estimations. Therefore, to determine the structure's service life, a time-based coupled assessment of corrosion and fatigue is required. In order to relate to real-world scenario, the deterioration of the bridge needs to be observed under the effect of incremental train speed. Hence, in this study, a numerical model of a truss bridge span using currently available codes is developed. The cross-girder and stringer, which experience high levels of fatigue stresses and corrosion, are numerically assessed for their residual life due to increasing train speed and daily carriage volume.
Fatigue Life Evaluation of Corroded Steel Truss Bridge Girder
Lecture Notes in Civil Engineering
Shrikhande, Manish (editor) / Agarwal, Pankaj (editor) / Kumar, P. C. Ashwin (editor) / Sakore, S. R. (author) / Ghosh, D. (author) / Ashwin Kumar, P. C. (author) / Shiradhonkar, S. (author)
Symposium in Earthquake Engineering ; 2022 ; Roorkee, India
Proceedings of 17th Symposium on Earthquake Engineering (Vol. 2) ; Chapter: 44 ; 591-606
2023-07-20
16 pages
Article/Chapter (Book)
Electronic Resource
English
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